Acoustic Cooling & How To Manipulate Heat With Sound (Thermoacoustics Part 2)

[@emorag]

Yes, please cover/explore traveling wave engines.

[@perrylc8812]

I was thinking about if it could be used in a Sterling Engine.

[@RealEngineering]

Man, incredible work. You saved me a massive headache in trying to explain this for my James Webb telescope video. Going to reference you in my video as thanks

[@Nighthawkinlight]

I'll be interested to learn how thermoacoustics is connected to the telescope!

[@demoaccount2392]

I will wait for ur video 😊

[@HughWilliams1]

I found this video because the Real Engineering JWST video got me curious about acoustic cooling. Even after seeing how it works, it's mind-blowing that this technology can keep the IR sensors on Webb running just a few degrees above absolute zero.

[@andreadelella863]

@@HughWilliams1 me too

[@Sagittarius-A-Star]

Wow - I guess it is a honor to receive a message like this from you.

[@sierraecho884]

This video is 2 years old and one of the best educational videos of thermoacoustics. Please keep going and create a traveling sound wave demonstration as well, I still do not fully understand how they work.

[@Munakas-wq3gp]

You could basically build a tube that will use sunlight to cool your house. Only problem is that it's going to produce noise :D

[@hamadaag5659]

Uhh yeah? Dude turn this into a whole series, please! This is amazing!

[@urano1988]

Yeah, let's dive into travelling waves!!!

[@SoulSukkur]

oh dang. this is advanced. youre even breaking out the mood ring technology

[@whatelseison8970]

I'm feeling mighty thermochromic atm!

[@gavinmurray5386]

You are very good at relaying info. You simply say what is true. And you disambiguate phrases/words/concepts that people easily confuse. I would definitely love to see more acoustics stuff!

[@Nighthawkinlight]

Thanks!

[@jamesmahoney5436]

Totally agree, and I would likewise love to see more with acoustics!

[@TheFloatingSheep]

Other science channels cover a lot of interesting stuff too but this channel's the one and only channel that I can rely on to find out something new every once in a while, then the other channels start covering the same stuff because of it.

[@lstein8670]

You should try applied science, it's a great channel

[@TheFloatingSheep]

@@lstein8670 Oh yeah I watch him too, he just doesn't post as often as I'd like lol, it's gotten better this year but a year ago he only had one video every few months

[@kirkc9643]

@@lstein8670 Applied science is great but often the science is beyond the capabilities/resources of most people. Also can be mentally challenging at times too.

[@justinw1765]

Besides this channel, I also like Robert Murray Smith, Tech Ingredients, Cody's Lab, and as mentioned Applied Science. But with A.S., I feel much of what he does is out of the purview of the average tinkerer. Sometimes also true for Tech Ingredients and Cody's Lab. I do like how NHIL and RMS do a lot of stuff that most of us can try or replicate at home as well (not always, but a good portion).

[@attilakovacs6792]

Dear Ben, I'm glad to see the Part 2 of your thermoacoustic video series! You have done a very good job and you are presenting the experiments nicely and clearly. I hope lot of people will start to interest about thermoacoustics because it is a really interesting topic of the heat-engines. It was a good collaboration I'm waiting for your next video! BLADE

[@Александртень-ф4т]

where is the continuation

[@Александртень-ф4т]

?

[@Scott_C]

Amazing concepts. Thank you for your help in making this more widely known.

[@TheLightningStalker]

Seeing cryogenic temperatures would be very impressive.

[@Molb0rg]

do u realize that writing from the wrong account gives Christina Khalil way much more subs than to you? lol I was filial to thermoacoustic so I dropped that women and subscribed to the right channel, but many with a weaker will may not be able to so yeah... will charge dangerously low ... resistance is futile ....

[@lukearts2954]

I hope you read new comments on older videos still: If you combine this video with your more recent video about self-cooling paint, and then build a system made with wind pipes, you could make a fully passive air-conditioner. The wind pipes generate the standing wave, the heat dissipating paint will radiate the heat away (either by feeding heatpipes to a cooling panel, or by painting directly onto the tube in the hot areas. The heat should radiate outward because of how your paint is made (the painted surface sticks to the paint layer slickly, allowing conductive transfer into the paint, while it also prevents the paint from radiating it back into the tube, while the outside will have a greater contact surface with air, allowing for convective cooling on top of radiation as soon as the temperature goes above ambient. Now if the wind is created by passive ventilation techniques, it would let the hot air create the resonance tone on the way out, while the cooled air pushes down and into the room, creating a fully passive clean cooled airflow even when there is no wind outside.

[@squidcaps4308]

The way those layers were kept separate: genius move. Really good idea.

[@ibeauf]

You should try to get a company to send/sponsor you with a thermal camera, you could use one so much!

[@KendallHall]

I have KZbin premium so I don't have to deal with ads, but so many KZbinrs have sponsors that I still have to skip past. At least the sponsor ads are easily skipped.

[@jonasphilbert6175]

These videos are absolutely excellent! The combination of high production quality and a clear build-up of information works so well. You manage to simultaneously be more informative than most other educational channels, without requiring excessive existing knowledge from the viewer. Bravo!

[@BeyondSlowMotion]

Awesome Ben! I always feel like I walk away from your videos creatively inspired. This was incredibly well demonstrated.

[@simonstergaard]

So true. Ben is in the Top 5 best science youtubers.

[@whatelseison8970]

@@simonstergaard And out of ones named Ben he's for sure in the top 2! (ref to Applied Science)

[@johnmcelwain5884]

@@simonstergaard t

[@tarstarkusz]

This guy puts ads on the video, plus his own sponsor ads in the videos plus wants patreon? I will NEVER support someone on patreon who does this!

[@Inertia888]

@@tarstarkusz I am sure the experiments that he shows us cost money, but either way, how come you don't just use an ad-blocker and call it a day? No more aggravation for you, and we all live in harmony!

[@lorinatzen]

I must say, this is absolutely the highest education-grade quality of KZbin there is. You are a gold standard. Keep it up!

[@bigblargh]

I'm a musician and I will gladly watch your videos on acoustics until the cows come home. You are the first person to ever introduce me to thermoacoustic engines & refrigeration. I wish this stuff was taught in physics class, but I REALLY wish it was taught in music class. Thank you!

[@CM-kl9qh]

I’m an engineer (would have been a research physicist if I’d had the coconut 🧠). But I also thought about a career in music. (Again, the 🥥.) Math is the link; the purist science of all! Good connection!

[@cmssubjects8472]

@@CM-kl9qh hi cm, can i know ur name...? 😃

[@CM-kl9qh]

@@cmssubjects8472 C M, not cm. ;-)

[@DAzZuLK]

It's satisfying to read such a comment. I do teach physics and love to play guitar. Once I had a very talented (musician) student. He needed to pass some tests in order to go as a exchange student. I was supposed to guide him according to the stablish study guide. He was way behind on math & physics. So, change of plans, fuck the study guide. I ask him to calculate the note will be produced by a string of a material, x lenght, and stretched by and T force. Immediately his mind set changed for the best, and got interested into the math and physics required, which eventually helped him to take those tests like a piece of cake, and got the grades he needed without hating physics and math as often occurs.

[@thomasruwart1722]

If you play just the right notes, you could be really cool...😈

[@sevret313]

I'd love to see this developed further, especially chaining the stacks together to get more extreme temperatures and building it into a device that can actually do something even if it might not be the most efficient thing.

[@Guru_1092]

SCREAM POWERED REFRIGERATOR!

[@1224chrisng]

is it possible to use the harmonics to get multiple nodes and multiple stack?

[@nidavis]

And also probably some ways to modulate the wave using ultrasonic or subsonic frequencies

[@MrLM1909]

Very much hope there will be a part 3! Also acoustic heat pumps seem to be a very interesting technology, would love to see you discuss the basics of those as well!

[@pinlap3875]

I would love to know what kind of set-ups might be possible for accoustic heat pumps too.

[@SiloXJones]

The way you've been able to break things down into a MUCH easier to comprehend way is honestly stunning. This is such a complicated topic with so much to try to grasp, yet you've managed to not only flawlessly explain it all, you manage to do it without ever sounding pompous. That said, HOLY HELL thermoacoustics is SO freaking cool! I never would have thought about using the flow of sound to generate/dissipate heat or even generate power. It would be incredibly interesting to see what the efficiency of such systems would be and explore whether or not they could be feasibly be used in lieu of more traditional methods. Like, is there a way that you could utilize the (natural or artificial) wind to generate a tone that could power one. What kind of energy could a thermoacoustic system provide under those conditions, and would it even be possible. It'd also be really interesting to see if different gas compositions (in a closed system) would produce results that are different than the natural atmosphere and what difference they would/could make. Higher/lower temps? Faster/slower diaphragm movement? Etc. There are a million questions that could be investigated; could it be possible to generate visible light using a certain gas mixture in a specific situation?

[@LifeinJars]

This is a really fascinating subject. Great video!

[@withlessAsbestos]

yeah, I put on my head phones and it gave me chills.

[@paulswang6428]

Agree, absolutely.

[@Asdayasman]

Oh hey cool to see you around.

[@ckpnair9508]

Absolutely Fascinating!

[@rufuslastname9121]

Love your stuff, life in jars!

[@CharlesTyree777]

You got a gift for teaching, one of the reasons I love your videos. Simple is better when learning foundational concepts. DIY is almost intuitively included with your demos. Thanks!

[@Nightstick24]

I’d love to see more on thermo acoustics, it’s a really interesting subject I knew absolutely nothing about! I’d love to see the travelling wave designs too!

[@GemstoneActual]

I'm with Night Stick.

[@skuzlebut82]

Dude, your delivery on every topic you cover is amazing!

[@anymancandoitwiththerightools]

I've been in HVAC/r for over 20 and all I'm going to say is you have my attention! This is some pretty interesting material!

[@Claymore1977]

same!

[@redcastlefan]

I love you man. I really do. so much quality, entertainment, education. But most importantly, its how you seemingly never give up on projects. Lesser channels make a project but with little to zero follow up after the fact. And I love how genuinely interested you are. It feels as if you're taking us with a journey of your own discovery instead of just being a show host.

[@skylerredding2490]

Dude, the amount of hours that I've enjoyed watching you is amazing, especially since i didn't really enjoy science class. if you were as science teacher, id come to your classes no matter how old i am.

[@smartaIec]

As a professional brass musician and avid science enthusiast, this video makes me incredibly happy. Your explanation of fundamental resonance and the harmonic series is very well researched and explained.

[@headbanger1428]

His models are so clean and more/less ready for a science museum. I hope you get funding from education, sir! Your contribution is massive and very interesting. I hope you’re getting adequate support!

[@noahpfluke6981]

Loved seeing the overview of previous "failed" builds! Always cool to see your engineering process. Please keep building new models, this is so cool!

[@jamesraymond1158]

Reminds me a an experiment done around 1967 with microwaves. A standing wave was set up with about 5 nodes and a row of plants along the standing waves. The height of the plants depended on their position along the standing wave. The height was attributed to temperature: where the waves superimposed, the temperature was higher and the warmer temp made the plants grow better. Where the waves interfered with each other, there was no temp increase.

[@tkdfriend]

Hey there Ben, Ive been a subscriber for awhile and I have no idea if you are going to read this but I just want to let you know that it’s ok to take a break from time to time. I know how stressful it is having people push you to make a new video and having to keep your private life out from work life. If you EVER need to take a week long or even month long hiatus, it is OK and I promise you that we will (almost) all support you in your decision. Your eye opening content has been played in many many many science classrooms all over the world and you are inspiration to millions. Again, if you EVER feel stressed or depressed don’t hesitate to take a little while off. I hope your doing alright and no matter what we’ve got your back 💙

[@Nighthawkinlight]

Thank you very much. I'm doing well for now, especially with warm weather coming on.

[@Boogerweldz]

good point! lots of the best youtubers dont pace out of the rush from the audience and burn themselves out. please take your time Ben, we can wait for this type of quality vs quantity.

[@loverlei79]

And...omg yes! Please continue this series!

[@guillermodanielarias9828]

F'mindblowing.. Searched for part 3 many times now.. I really wish to know more about this topic, I am going to recycle a subwoofer..

[@kuzunclekc]

I have actually NEVER commented on a you tube video but I have to say, Ben, you're an amazing teacher. Thank you for your inspirational videos.

[@nigeljohnson9820]

I became fascinated by this subject when I read a report that staff at Los Alamos used a thermally excited acoustic heat engine to cool the tins of beer served at a staff outing, come barbecue. The solid state cooler worked by placing one end of the unit in barbecue fire, and the other in a water cooler bath for the cans of beer. The whole unit resonated at a very low frequency, emitting a low humming sound. From memory, the report showed a dumbbell shaped arrangement with an air gap between the hot and cold sides. A schematic drawing showed the arrangement of parallel metal plates, refering to the dumbbells as Holmholtz resonators. From memory, the report was in an issue of Scintific America or New Scientist. I have since learned that the technology has found an application in nuclear submarines, but I do not have the details of what is being cooled or heated, but I believe it is the submarines electronics.

[@hiddenname7272]

I love how the foam balls distribute in discrete areas. Reminds me of quanta or something. Definitely a nice boltzman distribution. I think you are right about the beat phenomena being responsible and they distribute in those places because it minimizes horizontal motion in a standing wave. I bet you could take advantage of that to capture pressure differences for say an acoustic mass separator.

[@patrickday4206]

That's how holzman effect works 😂 sorry I'm a frank Herbert fan

[@trevader2562]

I feel like I say this almost every time, but the production quality and quality of content of this channel is nuts. I keep saying it because it impresses me every single time, so keep it up Ben! you are doing a fantastic job that always leaves me inspired!

[@Rom2Serge]

Р

[@BioMedUSA]

You have an incredible gift, plus the drive and intelligence, to be able to consistently tranform the wonder of science into beautiful art.

[@yoosahbiimi1338]

These are the kind of people KZbin must honour not the many fools wasting space

[@Uabero]

These videos are great, not just in "content", but overall quality as well. As for recommendations or thoughts on other videos, I wouldn't mind seeing things like thermoacoustics. Just stuff you don't normally consider or pay attention to, yet is fascinating if you take a moment to learn about.

[@BrianFedirko]

i do like it. for a moment, i'd thought of a traveling wave in a loop thinking i'd stumbled on to something original. was excited, and still am. it's thrown me into an imagined world using the concepts for metallurgy. developing new cheap metals is something we could all use. thanks, this has been thought provoking.

[@everybot-it]

You mean something like a particle accelerator, but for sound? (Oscillating air)

[@SuperTrollTV]

This guy has a wonderful way of explaining his self. It's easy to let the viewer get lost and just recite information to sound cool. I actually intook and consumed the information quite well and fully understood everything. A great teacher perhaps?

[@rayalburtus8086]

Using a cluster of smaller tubes arranged like in a conventional liquid/air cooler at a higher frequency might help solve the direct tube shell extraction method. Producing treble is more energy efficient than bass. It could scale into very high frequency coolers with relatively high energy efficiency.

[@gigigigiotto1673]

or just use a heat pump

[@mitchelldalton7405]

Nicola tesla would be proud we are finally uncovering how the natural system work and how we can use them to our advantage, high frequency is the key… these systems have no moving parts, unlike a heat pump

[@PongoXBongo]

I wonder if those smaller tubes could be placed in a radiator type configuration with fan blowing through them, or passively radiating hot/cold?

[@JohnnyYeTaecanUktena]

@@PongoXBongo are you talking about putting it in a computer case with a computer turned on?

[@PongoXBongo]

@@JohnnyYeTaecanUktena Not really. More so using a fin stack on those heat pipes, like a CPU tower-style cooler, no case needed.

[@harrybroadbent3321]

The first harmonic is your original wave with 2 nodes and 1 antinode, the 3 node 2 antinode is the second harmonic. Also a very interesting video I can't wait for your next one!

[@hamishfox]

Good point my friend

[@aaronl2794]

Rediscovering you after realizing that YT isn't pushing your stuff to the front of my feed. Made sure to click the bell this time. You are a Gem of the Internet!

[@robgrabowski2572]

I love the little smile he gives when his demonstrations work perfectly :)

[@Troubledsham]

new watcher here, would watch more on acoustic heating/cooling.

[@MrAnderson4509]

Acoustic ring resonant concept is intriguing and has other amplification applications I find absolutely essential to design, more work with this would be very useful and immensely appreciated.

[@anesthetized7053]

woah that thermochromic tape is super cool. i didnt know that existed! awesome series. please continue down this rabbit hole, its very interesting and im sure theres something to be learned from it.

[@gregoryzillich3047]

If only he'd link us where to find some, my Google-fu is failing miserably!

[@andrecook4268]

Super impressive, I can tell the story was well planned by how well it flowed and how easy it was to understand. I might have to build one of those polystyrene ball sounds tubes for teaching undergrad physics.

[@QuantumQuibbles]

Please do! I like this demonstration far more than the standing wave of a string experiments done in my undergrad studies.

[@chrisferrell6159]

I love this phenomenon. Resonating frequentsies are 1 of the few technologies that can produce over unity. Take a hard drive motor and put it on an old phonograph player. Install a large speaker at the face of the horn. Exite the motor with a hand crank radio. Find the right frequentsy and cut it on vinyl, in a repeating loop. Run the output of the speaker into a rectifier and capacitor. Control the motor with a potentiometer. The thing will run itself plus a light. The cone multiplies the sound from the needle to its largest point exponentially, for free!!! Just 1 way to go over unity.

[@andrewstambaugh8030]

Fascinating! I was a mechanical engineer once upon a time, and despite having classes on vibration-system analysis and design, I never saw anything like this. Watching this video with the color thermometer strip gives me a much better understanding of your other video (where you use heat to produce acoustics). It's also helpful in my understanding to consider that molecules are already in motion, so the heat-to-acoustic generator isn't creating motion, merely adding more energy into motion that is already happening.

[@GoatChease]

I've been patiently awaiting part 2. I love the methods in which you explain things, I'd be interested in seeing a collaboration between you and Steve Mould.

[@elmouhandiss]

Brilliant. Simply brilliant. My suggestion is the following. After explaining the concept with transparent glass tubes, you can collect heat or cold more efficiently with a copper cylinder around which you will tightly wrap a copper tube as a coil around the cylinder and solder it in place. Then, you can push some water (or a better fluid) through the copper coil to collect generated heat or cold.

[@cubaan]

Imagine an air conditioner that uses the heat from the sun to produce cool air without using a mechanical compressor! How cool would that be?! An even more energy-efficient and eco-friendly air-conditioner.

[@ELMohel]

Exactly! I live in a desert area and something like that would be awesome 😁

[@eenothlho2604]

You can try absorption refrigerator

[@ELMohel]

@@touyaakira4602 Nope, not really the same, close though. The unit I was thinking of would totally independent (utilized because of our 4th of July up and coming) of any external electrical implementation (utilized because of our 4th of July, up and coming). Oh B.T.W. ( Perrrrty Kitty icon) Thanks for the opportunity to Clearly indicate to true circumstance of the unit in question.

[@atomictraveller]

the arabs have got this, i forget what they're called, tower with vents at top leading to chamber underground or with thick walls, used to store ice.

[@georgiojansen7758]

@@eenothlho2604 already in use for wine cellars and more

[@Skogsraen]

this is some of the coolest stuff i've ever seen, PLEASE continue with this series as far as you can, i'll watch each and every one of them repeatedly

[@colincuster6226]

I will watch also, thank you!

[@MrLogo1002]

i keep reading this channel as "lite" like its short and sweet vids but this is way better

[@yeenyeen7154]

Definitely interested to see more! I work with sound as a composer and generally a noodler, and it's interesting how the properties of sound can be used for something mechanical like heat pumps. Very cool!

[@chris993361]

Please continue. I'm enjoying the series.

[@AmazingPhilippines1]

Cool! Sound is energy. I spent many years in the noise control business in the western USA so I am especially interested in using sound as an energy source to solve problems.

[@williamalber9648]

This was an amazing demonstration of thermo acoustics. First video of yours I've seen, and I'm a big fan now. I appreciated the mystery of wave/particle theory you presented in the understanding of standing waves. Your demonstrations truly reflects the work and research of the famous inventor Nikola Tesla (whom I have researched for many years). I hope this series on acoustics continues, and I wish you luck on your journey.

[@mettattem]

Amazing work! Reminds me of various chapters of 'Sound', written by John Tyndall. I don't normally comment on videos, but i find this subject to be particularly fascinating and you are doing such an amazing job presenting these concepts, so please continue! 🙏🌌🎧

[@ryancairns2317]

More of this please sir! Both absolutely fascinating and extremely informative. This is the type of stuff that could inspire aspirations for further exploration into the sciences amongst young minds both now and in the future.

[@gabriellautaru4058]

WOW, I'm totally impressed by your video. Perhaps if you had a fluid moving through the hollow copper pipes, to take the thermal energy differential thus generated, in or out of the system, it could possibly have unlimited potential uses. Imagine using the sun's heat to generate the necessary power so that you can use your thermoacoustic engine for internal cooling in buildings. Like I said, the potential of this kind of technology is practically limitless.

[@TheOnedeadguy]

He used heat pipes, so there *is* a fluid inside! They use capillary action and a fluid in a closed loop system. Used a lot in computer cooling and whatnot since they're *very* good at moving heat.

[@redfist2988]

If you were my professor when I was young, I would have become a Scientist

[@kahunakorteze2763]

😂 😂 😂 i thought the same. My kids will school here on youtube.

[@clayreal]

This guy is a poster centerfold of bed side manner meets Enstien crossed with Ripleys belive it or not. I hope he doesn't out grow the deep passion for sharing, because he is a superior communicator and brilliant experimenter. I'm soooo thankful for this guy.

[@delphicdescant]

Imagine a society without electricity being able to set up a refrigerator for their food that used no moving parts and only required they kept a fire lit in one specific spot.

[@luipaardprint]

Look up evaporative refridgerators, they're a lot more practical!

[@delphicdescant]

@@luipaardprint This is way cooler though. And it would get the kids interested in STEM lol.

[@luipaardprint]

Haha yeah true, this is way cooler.

[@V1ctoria00]

Could we use plasma

[@sirsteamtrain7913]

@@V1ctoria00 fire is a plasma

[@BobRoss-bp2yv]

Honestly, I never thought Science lessons could be so much fun and enjoyable.

[@jcmschott1895]

First of all, thank you so much, my friend! Me and a close friend use to share to each other your contents. We pretty often discuss about it and plan to share some of them with his students, what I'm planing to do as well when I have my own.

[@grinreaperoftrolls7528]

See, this is why I love physics. I would absolutely love to see more. There’s nothing that feeds my adhd brain dopamine quite like this.

[@10intexas]

Could this be coupled with a peltier chip wrapped around or in contact with the hot side to produce electricity as well as cooling. The result, a refrigerator with a light that comes on when you open the door.

[@johnlindsey7355]

Hello so I'm 40 and I've been thinking about my life and I need to find a better career I was looking into refrigerant reclaiming havoc and I was just learning about it tonight about reclaiming of the refrigerant and then I thought about your thermal acoustic cooling and how it's really the answer to a huge need in humanity for refrigerating her cooling and I was thinking about how wise you are and how all it takes is a few people to do a startup business with this ideal you have which I'm sure has been around for a while but not put the use or maybe just delayed and I was thinking man who is your family you're very wise and I'm thinking you're very special person and I love I can see in your heart and your eyes and your being you're enjoyment of teaching people the beauty of knowledge anyways and so I was just sitting here listening and heating and I was thinking you know in Russia I read a book once about some Russian people burning their banisters on their handrails cuz they didn't have heat and I'm thinking which sound we could just make heat and heat these people's houses for them you know like and and now I'm more over I was thinking about a system which involves all these new texts in a way I was thinking about ionized electricity from the atmosphere and your thermal acoustic thing and moreover my great idea that I had tonight I was listening so I was researching this refrigerant and I got to the part where I was talking about leaks and pressure testing the system and I was thinking you know if I was to build a system and I wanted to be able to tell if there's leaks all the time I just submerge the system in a bath of some kind of water or some kind and have a camera on it or plexiglass window that if I see any bubbles I know there's a leak and I was thinking that would be a good fail safe and why don't we do something like that like I understand refrigerator systems are complicated and such and such but the actual connection points it wouldn't be I don't know I just had this idea like that seems kind of right to me if you have gases that are like to in case you didn't like a goldfish bowl or something but anyways I think right now this is thermal acoustic cooling ideal you have you have the capability to change the world right now moreover I was thinking about in structures right cuz I'm building an RV right now and I'm thinking about throughout my RV skin putting tubes in it so that the hot air rises so it sucks the air from the bottom through the skin so that it's constantly cooling you know kind of like how it's sombrero the point of a sombrero is tall so the heat comes upwards and I was thinking about a lot of stuff anyways I just want to thank you for your videos God bless you man

[@That_Guy5575]

The ideas and concepts this channel continues to produce never cease to amaze me, many of which I've never even heard of nor even dreamed possible. Keep up the fantastic work good sir, and I hope to see you include your bird in more videos :P S/He's just so darn adorable!

[@trapfethen]

The smaller peaks are your harmonic frequencies. The tube doesn't simply vibrate at it's resonate frequency, there are also a series of harmonics overlaid on top. They are forced to be a multiple of the resonate frequency. If you take a spectrogram of the sound, You should see a big spike at the resonate frequency, and then a series of smaller spikes at your harmonics.

[@fukuokainternationaldemocr1974]

Correct.

[@hamishfox]

almost correct, they're actually an interference pattern caused by the overlapping of overtones from the fundamental combining with the other modes of the tube

[@fukuokainternationaldemocr1974]

@@hamishfox thanks.

[@gypsyjones1722]

very cool. There was something I saw using a bose style acoustic wave guide to amplify the sound-wave from a very small speaker on one end and transmit a much larger energy pulse to a diaphragm on the other end. The diaphragm was then coupled to a rod which powered a piston compressor for the refrigerator. The article stated that inside the wave-guide the sound level was amplified to an astounding 500 decibels! It also stated that if you were to open up the wave guide while it was in operation that it would disrupt the waveform and there would be almost no sound or energy inside the wave-guide enclosure. I thought this would be a revolution in the field of cooling and applicable to many other devices as well but I've not seen the device being implemented yet and it's been a few years now since I saw the concept explained from an M.I.T. paper.

[@Nighthawkinlight]

Thanks for the research lead

[@ChronicSkooma]

You're my only source for this black magic I need more.

[@Nightstick24]

It feels like it should be black magic! If they’d taught this in school maybe physics wouldn’t be so dreaded?

[@apathologicallypessimistic2474]

try NileRed

[@HopWorksET]

Nicely done!! As Spock would say, "Fascinating!" I have always felt that the industry behind compressed coolant for refrigeration has worked hard to curtail scientific developments that would drastically improve the designs behind the need for cooling. Hopefully, us, meaning the human race, is smart enough to embrace these technologies to make our existence self-sustainable. I have learned so much from just a few of your videos today! Thank you for your invaluable contribution!

[@kathrynck]

Well, not that people are never nefarious, but a lot of the 'locked in industry approach' issue you describe is simply down to a particular design being more efficient. At least at one point in time (with a given set of manufacturing techniques available, and resource availability). And then anyone who wants to be successful in that industry shifts to using that method, and then making tweaks and improvements to that method. Which ultimately kinda leaves competing approaches in the dust over time. And the further that goes, the harder it is to break the cycle, because businesses take significant financial risk to try something different.

[@Celler2]

The moment I saw that tube I instantly thought of a loop but more even a tube spiral, glad you mentioned it in the end can't wait to see it. A lot of these principles you explore feels like the missing mechanist from inside a Pyramid. The tube seems to vibrate similar to a crystal fork.

[@alexien2716]

Did/will you continue this series? The suggestions at the end sounded really cool but I'm having difficulty visualizing the usage of it. Thank you for your delightful and informative videos! I lost a lot of interest in studying physics after a horrible math course experience, but videos like this remind me of the beauty of the concepts.

[@Nighthawkinlight]

I haven't forgotten about this but I haven't made much progress yet. It's a tough concept for me to learn myself so it takes a lot of time to figure out how I want to demonstrate.

[@joshuagardner5580]

@@Nighthawkinlight magnifying glasses and or laser, tuning forks, and stacked parabolic or conical diaphragms instead of the rolled plastic. Would like to hear more of your thoughts on the looped system.

[@somepunkinthecomments471]

Those peaks you talk about remind me of something I noticed when prototyping an audio distortion circuit in ltspice. When a sine wave is distorted, it creates overtones, the volume of these overtones goes down slowly, until about 10 times the frequency. There are then these divots in the fft chart that creates a sort of bumpy look to the overtones. It appears as if the harmonic series modulates itself with each 10 times in frequency. Maybe this is a similar principle to your standing waves. My hypothesis is that the sharp increase in pressure around the fundamentals node actually distorts the waves inside the tube, creating harmonics that force the styrofoam pellets to rest in the nodes of said harmonics. The way you could prove this, is by measuring the pressure at multiple spots along the tube. I don't know the actual math behind sine and square/triangle waves, but if you plot out the pressure curves, they probably won't graph out a perfect sine wave. Hope that made sense.

[@erewrw1906]

But the distortion-peaks you mention are detectable on a SPECTROGRAM. One cant see them on the Waveform itselve. Oscilloscopes can show you the Waveform, whatever sound goes into it, shows often a wavy S-type form in a general, rarely you see an apperant secound wave . In order to show two waves among themselve, it would need to actually have one SINGLE Overtone from the distortion. And i know some Audio applications (accurate imitation of distortion) that actually produce those single-Overtone-distortions. So far it would actually be possible to see distortions like that, and actually if its just one spike it would NOT be the thenfold of Groundfrequency like here i think. But why would this be regarded as unexplainable by Scientists anyway, if its just Distortion? Distortion is wellknown..

[@erewrw1906]

i mean , is it unexplainable to Scientists, or to the Videomaker?

[@PongoXBongo]

@@erewrw1906 I was thinking it could possibly be a result of the pulse wave modulation (PWM) from his digital audio source? Would the same choppy pattern be seen with an analog source?

[@brethoward6943]

Love your works, and yes those foam balls are just arranging where they are supposed to! You should check to see how much magnetism is around that tube while the foam balls are dancing inside, I think you will be surprised with that experiment. Your an excellent teacher as I am learning more each video you make. Awsome thanks!

[@ralphpruett649]

"there is perfect harmony in the rising and the falling of the sea"

[@loverlei79]

My hs science teacher: today in class we're gonna learn about sound waves. Me: why are we learning this? Like Is there a practical way we can use this? HS teacher: sit down and shut up. 25 years later Nighthawklight: Today were gonna learn about sound waves. And we're gonna make a fridge out of it. Me: Surprise Pikachu face. Listening intensifies.

[@SF-li9kh]

Same. I just learned about standing waves as a lab experiment. A tuning fork and a resonating tube. What is the practical use? No one ever taught us.

[@DoubleBob]

@@SF-li9kh Thanks to standardized testing the teachers are incentivized to shift focus from "why" to "how". That way there is more time for repeating calculations (improving your standardized test results) and far less motivation/application (which would improve your understanding of a topic, your creativity and your problem solving skills).

[@peterlapointe3966]

Vyv

[@peterlapointe3966]

1

[@matthewstrauss4120]

I am loving these. I appreciate your pace, tone, and clear examples.

[@bugsbunny8691]

Nikola Tesla - 'If you want to find the secrets of the universe, think in terms of energy, frequency and vibration.' I love that guy. Brilliant and looney, can't have one without the udder.

[@lancasterspades6558]

As I continue to dive further into the STEM realm I'm beginning to learn that what you say is pretty accurate.

[@revimfadli4666]

Tesla had udders?😳

[@lancasterspades6558]

@@revimfadli4666 HAA!

[@Badgerheist]

We had great success during a senior capstone design project using a 3D printed stack using PLA. Have you had much opportunity to use DeltaEC to model your experiments? Would love to someday grab a beer with Greg Swift in NM. That dude is a genius.

[@Nighthawkinlight]

I haven't taken the time to figure out deltaEC yet. It makes sense that a 3D printed stack would work nicely. I haven't thought much about 3d printing for that purpose. I should think more about it as you could easily work in space for heat exchangers to the outside of the tube.

[@christopherleubner6633]

Use a thermoacoustic material to drive a stirling cycle and your can reach milikelvin temperatures. Use the fundamental as the primary mover and the 1st harmonic to drive the secondary stage. Gas medium will be 3He plus 4He for the coldest working medium. ❤

[@Bijlez]

I literally just watched part one and was so surprised to open my sub feed and see this as the newest video

[@alexanderthomas2660]

Cool! (In every sense of the word.)

[@mrgreenguy]

This is so cool! I wonder what would happen if it's done with say, a repeating explosion. Like a standing shockwave almost. Would it get super cold and super hot on the other end? or would it just overheat the entire thing and explode? Some fascinating ideas either way

[@caffeinato]

I definitely think it follows that higher amplitude/decibel waves cause more compression and should therefore create higher temperature in the gases on the hot end, but where I think that does go wrong is that this all has to happen in a pretty sealed system, and I think we can all picture what happens when things blow up in a confined space. So, you may just make the world's most well-intentioned pipe bomb.

[@Quroe_]

This phenomenon bends my mind in all the best ways.

[@davidryder3374]

As a professional refrigeration tech, I'm fascinated by this technology. There have been so many 'alternatives' to chemical refrigerants in the vapor compression cycle sent to me in recent years, but none of them have any hope of replacing the old ways yet. I'm getting very tired of the EPA and other governing bodies forcing my industry to completely retrofit to different refrigerants every few years, and I know my customers, who have to pay for these massive infrastructure changes, feel the same way.

[@engjds]

I cannot see the fuss about refrigerants, taken a few compressors off and they expel hardly any gas.

[@DreadKyller]

@@engjds My grandfather worked as a refrigeration tech for some supermarkets, where they run a lot of refrigerators. After years of working in that department he developed severe issues with his lungs due to the chemicals they were using at the time and eventually needed to be on near-constant oxygen for years until he passed. Especially with the much earlier refrigerants health issues were common enough that people affected by it were capable of taking claims of financial compensation for medical and added living costs. Some of these earlier refrigerants could cause severe problems even at 0.1% concentrations. Also it's not just about taking the compressors off, it's about when they're running as well. And hardly any gas doesn't apply when some of the refrigerants are particularly dangerous in very low concentrations. Additionally, a few compressors releasing "hardly any gas" compared to total effects of the many hundreds of millions or possibly even billions of refrigeration units in the world is a big difference.

[@engjds]

@@DreadKyller Interesting, but not surprising working in a place full of them, naturally they do have reactive properties. 0.1% concentration is very high indeed and I doubt anyone with several freezers all over the house bursting gas could cause that percentage, I estimate maybe a glass full of gas-lol, yeah difficult to guage, but its not as pressurised as you might think. You look at the volume of sky to say every fridges worth of CFC's on the planet and you are going into many zeros behind the decimal point, IMO it would not cause damage, but like anything else, you would need lab conditions to prove it.

[@dfxmonkeyhead]

Absolutely fascinating. As a musician and speaker designer, this physics lesson really appeals to me! Thanks!

[@jakerman999]

You touch on using a stack of heat exchangers at each end of the tube, taking advantage of the second node; but what about increasing the stack size and using a higher resonant frequency to also increase the node count?

[@kevis6310]

I'm so here for the traveling wave video

[@GeoffryGifari]

So the further partition of the styrofoam balls into more closely-spaced "walls" isn't explained by the high harmonic of the speaker's sound frequency? I got a little theory: the confined pressure wave from the speaker resulted in a standing wave pattern as you showed, visualized by the little balls. As these balls jiggle about and move into pattern, they rub against each other making extra noise, unaccounted for by the speaker. Confined by the tube, this also ends up forming a standing wave pattern. Styrofoam sounds squeaky when rubbed into each other (higher frequency) which could explain the close separation. but who knows

[@SGTGGeorge]

Hell yeah traveling wave devices!!! 😉 We need people experimenting, and sharing inventions like these to change the world for the better!!

[@rayalburtus8086]

The rapid motion of the beads is likely producing static charges on the Styrofoam beads that possibly relates to the individual spikes forming.

[@gary.richardson]

Maybe good idea to test the idea with a more advanced bead still light in weight yet has static dissipating properties, such as embedding hydrophilic material at the right depth and distribution.

[@gary.richardson]

Perhaps running an experiment is in order.

[@ErvahNoir]

Thank you for making these videos! I've always wondered what sound waves are capable of since I first learned how the basic shapes of them can influence each other so much! Just watching these has given me a few ideas for some projects I'd like to try around the house! Please keep it up and thanks again for being an entertaining and informative youtuber!

[@DanielGBenesScienceShows]

This is a very sound series! ❤️

[@Gameboygenius]

Yeah. It resonates strongly with me.

[@DanielGBenesScienceShows]

Gameboygenius Thank you playing along, and in key!