Acoustic Energy & Surprising Ways To Harness It (Intro To Thermoacoustics)

[@Nighthawkinlight]

If you're new to this channel here are a few similar videos I think you'll enjoy. History of a Lost Supermaterial & How To Make It (Starlite): kzbin.info/www/bejne/ZnrFiJSjpcZ4ma8 Re-Inventing The Carbon Lightbulb: kzbin.info/www/bejne/ipmlnK17m8-JopI A Japanese Master Craftsman Taught Me To Make Senko Hanabi Fireworks: kzbin.info/www/bejne/r6fShox7qpiiY8U If you'd like to support my efforts in making these videos directly you can do so through Patreon at: www.patreon.com/NightHawkProjects Thanks for watching, and thank you for your comments! I still read every one, and greatly appreciate your feedback. -Ben

[@ProPyroPower]

Amazing!

[@adruvitpandit5816]

You could have tried a small led that requires little power compared to christmas lighting rice bulb that you used.

[@babblo]

You should have use starlite instead paper...

[@lukesnyder3358]

There you are with your variety of crack pipes... The glory!

[@mason_freeman_33]

This dude def wasn't vaccinated

[@theCodyReeder]

Ah! Even without part two I can see how this can be used for cooling! Awesome video! To get power out of the coil you should try smaller wire, more turns, and an iron core. Or maybe go bigger with the design. 😉

[@einname9986]

what about an extra large version for your mars base?

[@Bobsry16]

Hey, love your channel keep going!

[@rustycobalt5072]

Could you see how this could be applied to *solar thermal power* Using IR from the sun as heat input and a closed system boiling/condensing water as outputs (output IR while condensing such as a radiator) for cooling the system On top of a turbine of course, wonder what kind of efficiency that could get Together you have a radiator, refrigerator, solar panel and a turbine from sunlight and sound Think in terms of frequency my friends

[@whatelseison8970]

I was gonna say the same about the coil. I'd also say don't bother winding it yourself. The coil from a solenoid valve, microwave turntable motor or a shaded pole motor are readily available options.

[@lukem3250]

Hiya Cody, nice to see you here. Apart from the coil with thinner wire and more turns he should stack few magnets together - not too many to prevent the rubber membrane from deflecting too much, and use an AC volt meter to show the coil voltage. After that he could start thinking about connecting a LED with 'full bridge rectifieeeeer' or two LEDs in oppose polarity way as it is AC rather than a light bulb.

[@Donnerwamp]

Thermo Accoustics, the science of hot tunes.

[@ezradelsman6743]

and fire beats

[@lukesnyder3358]

Smoking crack never sounded so great

[@ZedNinetySix_]

slick af

[@JOSH-st2me]

H

[@lukesnyder3358]

@@JOSH-st2me press alt f4 to cyberpunk

[@JerryRigEverything]

Super cool! They also use sound waves to cool the camera sensors in the James Webb telescope.

[@paladinkhan]

Fancy seeing you here without a "fancy seeing you here" comment under yours. Glad you enjoy this wizard too

[@dankirkland1602]

Ha ha. There is no sound in space. Lol. Jk. I'm sure they have the right contraptions to make it work.

[@GeorgeZaharia]

​@@dankirkland1602there is sound in space, there isn't enough particles to make the sound waves travel fast enough for you to hear it... Ul hear it but probably will take longer to get to you or the sound will be so distorted and lowbase it wouldn't make sense when it reaches you. 😂 Like a creeping fart 😅😂

[@Unsensitive]

I highschool over 20 years ago, I found this out using a 6 ft cardboard tube and a bunsen burner. It was so loud the windows vibrated, and was heard through the entire school. Sounded like a fog horn. And thus ended our "free period" in advanced chemistry class

[@brodriguez11000]

Budding musical career cut short. :)

[@Dremaus1911]

xD

[@Dremaus1911]

@@brodriguez11000 isnt that kinda how hitler was born but instead of music he wanted to do art?

[@carenbarnet378]

How sad your curiosity at that young age, was not channelled to finding out your questions of ... Why is it so?

[@woodhonky3890]

cardboard didn't burn? That's preposterous.

[@andrebartels1690]

I've never seen a video from you that would have been boring. Your style of narration, your own fascination on the topics, your way of showing the working principles in detail without giving me the feeling that I'm a dummie. You are in the list of my absolute favourite content creators, each one for their niche. Keep up the good work 👍👍👍

[@stspy212]

Your presentation skills are spot-on. "This is the phenomenon we're talking about. It works roughly like such and such." *demonstration of what you just talked about* "Building on that, we can use that phenomenon to do cool things." *demonstration of the cool thing* Thanks for teaching me something neat today!

[@agent136]

DUDE! This was the research I did for Texas State University. Our goal was to create a thermocouple using the resonance wave in a tube with open air. We were hoping the get the cold side of the thermo couple below the dew point and generate water. We were able to get a difference in temperature by 20 degrees F. Super exited to see more of your work on this topic!

[@MD-qh6ld]

fahrenheit is not a linear scale.. between which gradiant temperature exactly? or in °C?

[@agent136]

@@MD-qh6ld its been a long time since I have worked with that stuff, but the hot side was up to around 80ish degrees and the cold side was at 60ish. That's all I meant.

[@peetiegonzalez1845]

@@MD-qh6ld Yes it is. A 20°F change in temperature is equivalent to 11.1°C or 11.1K change, and requires the same energy change at any starting temperature.

[@dafenz5902]

Dope! Was this research published - and if so, where?

[@agent136]

@@dafenz5902 Unfortunately, we were unable to write a scholarly article about it. However, we did win the undergraduate research conference at Texas State University in 2017. I worked under Dr. Asiabanpour.

[@AppliedScience]

Really nice demo! Looking forward to the refrigerator!

[@AnkitSharma-1337]

One ben watching another ben doing cool science xD xD btw love your videos Applied Science!

[@JohnSmith-eo5sp]

Traveling-wave tube based refrigeration is being developed by NASA

[@GuRu_MaNTer]

😂😂😂

[@gtjack9]

@Truth Never Lies ...But you just said it yourself, NASA are contributing to developing the technology... so they are contributing something? All science starts with a a hypothesis and can only be developed from there.

[@ulysses4536]

Interestingly, I thought of you when listening to this guy. Two things. Not only that you both perfectly formulate your thoughts so that it's easy to follow, but you even have similar voice timbres IMO.

[@1306anand]

Seen many KZbinrs explain a lot of stuff. You're currently in my top 3 best teachers of science in KZbin. You make learning fun, easy to understand without jargon. Simply amazing work. The world is a better place with you on it for sure 💯😎👍

[@johncoulson9613]

I woke up this morning and learned something totally new. Never heard of thermo acoustics in physics or engineering classes at uni (NZ) but there it is on KZbin. Thanks and I hope you realise that you are really good at this teaching stuff.

[@Advoko]

Interesting! I read somewhere they installed special clay vessels filled with mercury into a castle's air ducts to create occasional "ghost" sounds when the air was quickly cooling or heating...

[@theflamingbanana7491]

Lol. Mercury

[@Scott_C]

@@theflamingbanana7491 LOL ... ? It's a naturally occurring element. Where's the humor?

[@MrMagentaSkillzFilms]

*Freddy mercury starts singing from the castles air ducts*

[@GridDweller77]

@@Scott_C uhhh, the fact that it's a toxic heavy metal?

[@Scott_C]

@@GridDweller77 Go watch Cody's channel explaining Mercury.

[@kenmcmullan9330]

I generally hate "sponsor ads" in the middle of videos. This is an exception. I love the way you introduce them and I empathise with your reasons for liking them. Some people can suck up a formula and regurgitate it. They'll go far in their careers. Some folk Can't. BUT with the right teacher, they'll see the "THE WAY" is not necessarily the only way. Those people will go wherever they wish. I love your videos. You educate on my level and I'm a Chartered Engineer with a Master's Degree!

[@Nighthawkinlight]

High praise! Thank you very much

[@Respectable_Username]

I mostly watched the ad instead of skipping like usual because good birb. Which I guess means I fell for his trap 😂 But also, agree that that was a really good explanation of _why_ the service would be worth using! Still not a tool for me, but if I knew anyone with middle school or high school aged kids who were struggling to "get" science, I would definitely point them in that direction 😊

[@GadgetBoy]

One last thought: My memory is a bit hazy on the specific equations, but I can try to point you in the right direction. The frequency that the diaphragm is vibrating is very important to calculating the ideal impedance of the coil you're using to harvest the power. If I'm remembering correctly, for this application, you're going to want LOTS of turns of very fine magnet wire.

[@llantup]

I'm not an expert; I've just been tinkering with electronics and electricity for much of my life. For a test like this I would, as Gadgetboy says, use magnet wire. I'd start with at least 100 turns, but I could see it taking much more than that. Instead of a bulb, use a multimeter so you can see the voltage you're getting as well as the current when running it through an LED bulb. Sounds like a fun experiment, and I'm looking forward to the thermoaccoustic refrigerator!

[@notamouse5630]

Impedance of the coil really needs to match the load. As the load is a neon bulb, fine wire is required. Were it an LED, this size is almost acceptable.

[@GadgetBoy]

@@notamouse5630 That's why I suggested to try LEDs with his current coil. it won't work *well*, but there should be a result. An oscilloscope would also be illuminating.

[@H33t3Speaks]

Contract a coil winder!

[@zackbenedict7895]

If your looking for a decent voltage from your magnet, you'll need to use much smaller wire, so you can have more turns. Also try not to let the thickness of your coil exceed the thickness of your magnet. Lastly, keep in mind that when one magnetic pole travels in two directions rapidly, the energy produced from any coil around it will be alternating current, which you would need to build a bridge rectifier for if you want DC current for running led lights. A small capacitor hitched to the positive end of the rectifier would also help, as it smooths out the pulsations in the wavelength.

[@gogogeedus]

would diodes work?

[@robinhellier7436]

@@gogogeedus Yes, you could use four diodes to make a bridge rectifier, but the voltage drop across them would steal a lot of your power. LEDs will work on AC because they will conduct on the peak positive cycles.

[@andrebartels1690]

You could also solder a pair of LEDs parallel, with opposite polarities.

[@EmmittBrownBTTF1]

Diodes will run with AC with 50% duty.

[@christianbautch4015]

I don't think his copper coil was positioned right either.

[@DrValerie800]

Wow...you are a WONDERFUL teacher! Not only do you get the information across succinctly but you also make it simple enough for those of us who are not mechanically inclined. Thank you! 💗

[@dancoulson6579]

2:44 - I observed something interesting here. When the tube is vertical, the convection currents going over the heater carry heat away. However, when you put the tube on its side, the convection current was significantly reduced, and the heater glowed a little more brightly because there were less air flow to carry the heat away. In essence, you created a device where the energy conversion can be manipulated. Verically for sound, kinetic (moving air), a little light, and a lot of heat. Or horizontally for more heat and light, but less kinetic and no sound.

[@ninjaz5736]

That part about beats is often how musicians tune fine-their instruments. When tuning a bass guitar (where I change the lowest string relatively often), I can mute the amp and physically FEEL (through the body of the guitar) the pulses to see if the bottom string is in tune (with a higher string playing the same note), so no need for a tuner, and no need to have everyone hear me re-tuning. When playing a brass instrument in a band, if I hear the pulsing/beats happening with someone else playing the same part, I can "lip" the note (sort of "bending" the pitch a little bit) to make it more in tune with the other player (and they'll usually do the same so we end up somewhere in the middle). Once you know about it and how to listen for it, it's a very useful phenomenon!

[@kyrius_gm4]

I think this is the best stratergy i've ever seen to keep the attention of viewers when it comes to a sponsorship! I couldn't stop watching the bird! So cute!

[@Jiraton]

I am new to this channel, and this is a treasure of the Internet !

[@cliffchan6966]

You are the only one that I have seen on KZbin that correctly explains and demonstrates the thermoacoustic engine. All others I have come across so far are stirling engines that are wrongly called as thermoacoustic engines. Keep up the good work👍

[@Dog-Girl-Defect]

This man is a wizard.

[@1ucasvb]

Confirmed. Wizards always have pet birds.

[@Starkl3t]

He's seriously a genius

[@mailamaila5918]

@@1ucasvb funny , good job

[@dontevenworyboutit]

Holding a bird so people will watch the sponsored part is more brilliant than the sponsor

[@christianwilliams4242]

worked on me!

[@FractalPrism.]

sponsored part? whats that ive got SponsorBlock makes youtube far more bearable and doesnt waste my time selling me crap.

[@dontevenworyboutit]

@@FractalPrism. then u missed out on the bird

[@rays5163]

Not gonna lie, when I saw "thermoaccoustics" I was hoping there was going to be a saxophone flamethrower

[@dsdy1205]

so, a J-79 engine?

[@richardwendling4030]

That is on Kenny G's youtube channel

[@revimfadli4666]

Or Karim from Fire Force

[@THEmaggspie]

lol deadlly

[@OneAffected]

LOL

[@BaronVonTrumplton]

Why did I not have a teacher such as yourself when I was at school… Amazing! Please keep up the great work

[@SuperMIKevin]

That commercial was brilliant! Not because of the subject but because I know you used the bird to hold my/our attention on purpose while actually continuing the AD. I wonder how many people actually fell for it for the extent of the AD.

[@redcastlefan]

Now This is a great thing. Its late night, I have hot coco and i have new night hawk content. God is Good. Such high quality, so interesting, so nice. if theres one thing i wish never goes stops coming, its your content.

[@gizmo9987]

One time I was sitting in traffic turning left. The five cars in front of me had their blinkers on. I saw all five blinkers blink at the same time twice! I was so excited I had to tell someone and that's when I realized I was driving alone. It was the saddest best day I've had.

[@CutshallcapturesPhotography]

But you arent alone. I seen this too, and was too excited. Only to know i was..alone.

[@falsehero2001]

I watched part 2 before part one. This is exactly what I thought could be done within device. It’s a solid state Stirling engine generator!

[@vermontsownboy6957]

HOLY TAMOLE! Where has this channel been hiding from my view! Fantastic, clean, clear, transparent explanations of interesting subject matter. Great content. You've got your latest 1.98...01 millionth subscriber.

[@mattw7949]

This is by far the best explanation of thermoacoustics that I have found, and I've watched a hundred recently. Thanks for this awesome presentation. 3 years late, but you win a sub.

[@carenbarnet378]

Wow. Night Hawk I love your simple explanation for heat, sound and using the two to provide an engine. Where were you when I was a toddler? I am now 63. I was asking so many questions , my parents let me loose in their library. If ever there was a question... I had to ask it. You have re-sparked my interest in physics. Looking forward to watching your other videos

[@JTThumpington]

Fascinating! These principles can also be applied to radio antennas. The wire wool is the feedpoint and the rubber diaphragm is working in a similar way to a loading coil (inductor), which can be used to make the antenna operate on a lower frequency.

[@dextrodus]

Who cares about actually generating electricity, I have never seen such a good looking engine

[@StephanBuchin]

Your sponsor couldn't find a better channel to support 🙂

[@jinchey]

The way you pace your explanations is perfect.

[@mscir]

I'd like to hear an thermally-driven acoustic pipe organ, that would be interesting and work great with the right music, slow and haunting. .

[@jackfoster78]

look up pyrophones - lots been tried already!

[@cocospops9351]

When you turn the tube sideways, it looks and sounds like you're pouring a big glass of disappointment.

[@lukesnyder3358]

Not only does his crack pipe sing him a lullaby but it's a creepy theramin metal one

[@TGears314]

2:49

[@DreamwalkerFilms]

I appreciate your style so much. Thanks for being a good teacher and a passionate scientist. And for not having a dubstep intro. LOL

[@NATEDOGGYSTL]

Really cool!! Sound is one of the most fascinating things in this life!

[@alexwolfeboy]

I can say for a fact, I loved your assistant during the ad segment! Would love to see more of him/her!

[@exiletomars]

I feel like recording those tones from the quartz tube onto tape and splicing the tape into various rhythms and stuff would be something avant garde musicians of the 50s would have been obsessed with.

[@whatthefunction9140]

this could be expanded into a freaky piano

[@TytoMobile]

Nobody: Mattias Krantz: *I Put THERMOACOUSTIC ENGINES on a Piano and then Hired a Piano Tech to Fix it*

[@wep6433]

I was thinking something like a steampunk thermoelectric organ.

[@whatthefunction9140]

@@wep6433 well yeah!

[@ChrisBigBad]

@LOOK_MA_NO_COMPUTER interested?

[@ChrisBigBad]

erm. of course @LOOK MUM NO COMPUTER - how to do @-replies for usernames with blanks? @LOOK_MUM_NO_COMPUTER ? @LOOKMUMNOCOMPUTER ?

[@AFMR0420]

I’ve had the idea of an acoustic flying machine for many years. Acoustically actuated plasma controllers for anti-gravity drive also has been a sound theory. Lol. Thanks for such great videos.

[@plandl1]

I love the way you speak without ever saying or stuttering. It's like you should have a television show like Professor Proton instead of a KZbin channel. Keep up the good work!

[@Nighthawkinlight]

I use a teleprompter. I'm not well spoken normally

[@gordonstull1962]

Good stuff, I never could exactly figure out why that 1/3 ratio was so important. I patented an expansion tube exhaust system for a internal combustion engine back in 1991, that worked with that 1/3 ratio. Unlike a megaphone these expansion tubes had a long convergent section that was highly sensitive to low frequency acoustic frequencies, of which were highly penetrating acoustic waves, that increased the vacuum at the intake manifold. I like to think of the 1/3 ratio as being a under square vortex... the greater the pressure, the greater the energy density from coil & uncoil. I can't wait to see your next video!

[@gkdresden]

In order to make useful engines with higher efficiencies it is convenient to use lumped element resonators (Helmholtz resonators) instead of thermoacoustic resonance. It means, you need a gas mass and a gas spring separately, which can built up by use of a gas volume (as the spring) and a gas tube (as the gas mass inertia part). The effect is mainly to reduce the resonant frequency of the engine to operate a moving magnet linear generator. I have developed a double piston engine of this kind delivering around 1 kW of electric output power operating with electric heating with about 4 to 5 kW input power (I have used electric heating for simplicity and to measure the COP in an easy way). Maybe this is interesting for you.

[@paladiandrei4751]

Could you please show us some photos/videos?

[@33left]

I would be interested in your setup also.

[@royhopkins974]

Please demo on a KZbin video

[@lignesdefuite]

This is amazing - it's a cool subject, well made and really accessible. Thanks so much for sharing your experiments with us!

[@rushi2529]

I’m sure many people have told you this. You are a fantastic teacher!

[@kevinm413]

I watched through the entire Brilliant ad just because I was mesmerized that you were wrestling with a parrot. that was super cool. Also the science blows my mind too- but the bird was the coolest thing I have seen this week. My dog is my best friend, and now I wonder if you can have that kind of relationship with a birb.

[@twocvbloke]

Not really related to the hooting tubes, but the overlapping frequencies was how tone-dialling on telephones worked, sending two frequencies at once, which produced different sounds, not to mention other tones used the same effect such as dial tones and ringing tones... :)

[@whatelseison8970]

You used to be able to dial a phone by playing the (DTMF) tones into the phone from a computer and in the very old days, you could hijack the whole system with a whistle. lol.

[@Todesnuss]

I was so distracted by that bird I paid no attention to the sponsorship. What a lovely bird.

[@irishelbling9255]

its honestly a stroke of brilliance tbh because now brilliant lives rent free in your subconscious and you probably associate it with cute birds. lol

[@SolarWebsite]

4:49 for a second there I was convinced you were going to take a sip! This made me realise that I may have watched too many Tech Ingredients videos ;-)

[@NoOne-zm4rb]

You have great ability in communicating these concepts and giving detailed and usable instructions.

[@pjmartin6249]

Excellent teaching skills. So much knowledge, about subjects/concepts that obviously excite you, clearly conveyed through explanation and demonstration. All while avoiding any condescension. Truly a marketable skill set you have sir. Thank you for your contributions.

[@gramursowanfaborden5820]

note to self: toaster organ.

[@benjaminsmith2367]

Was thinking the same thing.

[@JinKee]

r/dontputyourdickinthat

[@uilsoum875]

*the phantom of the opera echoes throughout my house* ah shit i burned it

[@thematronsmilitia]

Sounds way nicer than an organ toaster. I don't want my organs toasted

[@stephencoles4043]

What brought me to this video was discovering that the James Webb Telescope will use a thermoacoustic refrigerator to cool the medium infrared sensor from 40 kelvin down to about 6, so thank you for explaining how it works.

[@ahmadtajy7178]

Just hearing this dude's voice makes me feel better

[@arthurmoore9488]

What's fun is as I watched this my EE classes kept coming back to me. As soon as you explained the positioning and how the 2nd tube was 1/2 the length, my first thought was it being a harmonic. When you explained the drum skin's effect I immediately thought of impedance matching and how adding things can change the impedance of the overall system. It's not a perfect analog, but works really well. Of course, as many EE's will tell you, high frequency RF is black magic, so I'm definitely not an expert.

[@scaleneous]

1:51 Demonstration of sounding, and explanation of flow inside a tube. Excellent!

[@TechsScience]

Play with your pet when you promoting the product this way the people don't skip the add *Brilliant*

[@theecstatic9686]

Not his first rodeo....

[@sbastian6633]

So true 🤣

[@GadgetBoy]

The bulb was too high resistance, put two leds in parallel, but reverse biased, and try that. I can almost guarantee you'll get light.

[@Basement-Science]

pretty sure you wont. You need a ton of turns to get to even a volt with something like this at a low frequency.

[@KaedennYT]

@@Basement-Science Small LEDs can light visibly with less than a volt and with microamps of current. It should work.

[@Basement-Science]

@@KaedennYT the voltage is the bigger problem here. This might be as low as 1mV per turn or even less. If you dont get enough voltage, there will be no light at all because you wont even get a microamp to flow through an LED. Also I'm not sure what kind of LED would light at less than a volt in the microamp range. I know green leds can light visibly at around 2.4V 5uA, and those are already some of the most efficient ones together with blue ones.

[@tribalismblindsthembutnoty124]

You would need four. That will function like a full bridge rectifier.

[@Basement-Science]

@@tribalismblindsthembutnoty124 Then you need even more voltage for that.

[@jabberwockydraco4913]

I was wondering, could a big ass Rochelle salt crystal be used to make electricity from sound?

[@alexrogers9086]

If the vibration is sufficient. You may have to add a horn to focus the sound wave

[@fgbouman1]

I saw that a pulse cryocooler is used on the Webb telescope. I found this video which, after watching a half dozen others, actually explained what was going on in understandable terms. Thanks for that. Finding out how gas-powered refrigerators work was a bonus

[@QF2653]

This is the BEST explanation yet of how these work.

[@johannesmajamaki2626]

I almost reflexively skip ahead when I hear a phrase that indicates transition to a sponsor spot. But... that bird.... I just.... couldn't.

[@Scott_C]

That's why he does it. It's also one of those rare occurrences where I look forward to the sponsor message in a YT video. :D

[@murphygay7606]

8:08 for ur viewing pleasure!

[@michaelprice3031]

Lol, I just muted it

[@brucelarsen6650]

Somebody playing with their bird, on camera, in front of everybody, really kinda grabs the 'ol attention, dunn't it?

[@bassett_green]

This is a really cool demonstration of something I had never even heard about before

[@kevinbyrne4538]

15:56 -- Wrap your coil around a rod of soft iron. Then move one end of the rod close to the magnet on the vibrating diaphragm. The moving magnetic will induce an oscillating magnetic field in the rod and that oscillating field will in turn induce an oscillating current in the coil. Using fine wire and many turns helps to increase the output voltage.

[@skaownz234]

Thank you dearly for spreading this knowledge. I studied physics in college and the fact that I hadn't discovered thermoacoustics until a few years after I graduated is flabbergasting.

[@C_U_R_I_E_L]

Very well explained obscure concept, sleek video with great cinematography, no stupid thumbnail (usually acting as a barometer of intelligence in many facets), no screeching voice that is extremely stylized with ethnicity and gender, and excellent lack of horrendous-3 major-chords-only song made with the same .wav sample whistle and bell decibly amped over any previously inteligible dialogue. Perfect for my ears and mind. Subscribed. Thank you so much for sharing.

[@AngDavies]

Reminds me of a pulsejet/barking dog experiment- the resonant kind, with the flammable gas in side of the tube, and the compression and heat needed to ignite it oscillating rapidly Edit: I guess all pulsejets are resonant in the same way as the valves aren't controlled actively

[@TheHarleyEvans]

now could you build a setup of many tubes of varying lengths across the top of a ruben's tube, to emulate the original piece of music in the new "thermo-resonance" instrument ?

[@TheGrinningViking]

Oooo, classic pyrophone technology. Though the pyrophone involves a variable strength flame below what is essentially an organ tube (though they are usually glass, for the visual effect.)

[@MineYamato]

I got recomended this video and first watched the sponsorship because of the parrot and then the rest of the video. You sir are a genious

[@PoisonNuke]

the open end of a tube does in fact reflect the wave back inside. Its the rapid change of acoustic impedance, which causes the reflection. Its a "soft" reflection, meaning the low-pressure part of the wave with high velocity is at the point of opening. When you have an exponential opening (horn, waveguide), there is no reflection and no resonance.

[@Nighthawkinlight]

You're right in what you say, but I don't think reflect is a good word to describe it. It's a different phenomenon, caused by the velocity of the particles carrying them out of the tube so pressure inside the tube briefly drops, until atmospheric pressure forces its way back in. It's sort of reflected, but not in a very simple way. I use the word reflect in a way synonymous with the word bounce.

[@PoisonNuke]

@@Nighthawkinlight isnt it a "bounce"? Because the first wave-front is a high-pressure area moving from within the tube to the outside. At the opening, the high-pressure will decrease rapidly and because of the inertia of the molecules, overshoot the equilibrium with the following expansion-zone. Thus some of the air is "sucked" back into the tube. So it is not bounce like when a ball hits the ground, but more like something falling onto a trampoline, isnt it? I call this soft and hard bounce, as it describes the difference between acoustically hard and acoustically soft.

[@Nighthawkinlight]

You could look at it that way. I suppose that's the trouble with using non technical terms, the definitions get messy.

[@PoisonNuke]

@@Nighthawkinlight "acoustically soft" is a technical term used for exactly this situation. So its well defined. Where is the issue?

[@ashketchup247]

Screw science classes in high school, just sub to this channel you'll learn more and have a more fun time doing it.

[@Stadtpark90]

The use of the bird to make me stay through the Ad was „brilliant“.

[@justinholtkamp9972]

Does this have anything to do with the frequency of ignition in a pulse jet engine? ( my thought is that the heat and expansion push air out of the pipe. And then cooler air is drawn back in before the cycle repeats)

[@singmenow4u]

Oh oh, now yer talking about ufo stuff. Good ole USA tech.

[@giovannimazzocco499]

I just discovered this absolutely brilliant channel about popular science. Amazing! Looking forward to seeing more experiments! 👏👏

[@ui4287]

Even though the copper coil wasn't optimal for electrical generation... it would have been cool to attach a multimeter to measure what was generated! Great job partner! Keep em coming... thank you!

[@MrRoboskippy]

I think some are using thermoacoustics to make stirling engines more efficient.

[@diceblue6817]

all this time... his bird has secretly been the sponsor 🦜

[@ianmelzer]

You can get beats in a crowd of screaming people.

[@bibicatb9362]

your point?

[@abdulmuneem7347]

@@bibicatb9362 He's just stating an interesting fact.

[@agnosjr]

Awesome video, thank you for sharing and doing all of the research about it. One thing we can notice is that on the big tube when tilted horizontally without the air flow the heat on the resistance rises as it glows stronger. Cheers Ben and again thank you.

[@amazonicscircuitri3762]

It's like a Sterling Engine 🔥🔥🔥🔥 You are Brilliant man👏

[@thePyiott]

Me: Im so tired and want to sleep KZbin: Acoustic Energy & Surprising Ways To Harness It Brain: yes

[@zeekjones1]

You can get a pre-made coil for your light from an old pair of headphones.

[@_B_K_]

You could use an oscilloscope instead of an LED.

[@pixelpatter01]

You could use a voltmeter on AC also.

[@jurajvariny6034]

He didn't even use a LED, but incandescent lightbulb. I was sad to see this missed learning opportunity. LED needs much less energy and would light up easily. We did many experiments like that as kids with LEDs, coils and magnets. And that was in 90s with much dimmer LEDs than we have now! Plus if you wire two LEDs parallel but in opposite directions you can nicely see it's AC as each one blinks every other half wave.

[@SP-mp9yi]

Fantastic. I found a Beautiful model Stirling Engine at a flee market, the seller had no idea what it was and I think he had his doubts on my theroy once I did my best to explain the history of the External Combustion process haha, it works flawless and it's painted in an old time Red and Green.

[@RonaldPeterson1]

You made the very most coolest video on the internet! I have read so much about this. It is fascinating to me. I have never seen such a wonderful demonstration. The chalkboard is interesting, but real life is so much better.

[@kpatton-ir9oc]

You should show sound making heat 🤔

[@Nighthawkinlight]

That will come later in the thermoacoustic refrigeration video!

[@kiffsimprovedchannel5022]

На канале "Игорь Белецкий" есть много классных видео про этот эффект

[@mattp3518]

The reason it vibrates is because of the energy flowing through it. Heat is vibration. Sound/light is the same thing. Makes sense it would vibrate when a shit ton of energy is flowing through it.

[@directorsofradiantcipher1996]

I'll leave a more detailed message later. In quick time twas necessary to express my significant appreciation for your videos which have indeed changed the course of my life steeply upwards expiditing my comprehension and proficiency with applied physics

[@andythedishwasher1117]

So pumped for this next video! My survivalist musician friends are gonna flip!

[@Tassie-Devil]

Spectacular clarity of explanation! For me you find the perfect balance between insulting dumbing-down and confusing 'teknospeke' that assumes too much of the listener. Quite separately, it was a helpful introduction to thermo-acoustics, as I'd seen model engines in action but never understood the science behind them.

[@AVOWIRENEWS]

Wow, a video about "Acoustic Energy & Surprising Ways To Harness It (Intro To Thermoacoustics)" sounds absolutely fascinating! The field of thermoacoustics is so intriguing, especially considering the innovative ways in which sound energy can be utilized. It's amazing to think about how sound, something we experience in our daily lives, can have such a significant impact in scientific and technological realms. The exploration of acoustic energy really opens up a world of possibilities for sustainable and efficient energy solutions. I'm always excited to learn about the creative and unexpected ways science can be applied to improve our world! 🌍🔊🌱

[@TheSupershoz]

The way you're demonstrating acoustic Technologies is going to explain a lot of ancient Technologies... this s*** is amazing... more please Scott

[@2550205]

2:05 that is a B4 and 495 hz according to the Hz meter on the pocket computer here the smaller tube is producing a B3 which is 475 hz when you put them together they are producing a wave of 485 hz

[@lukestockett252]

Dude, you're getting really good a speaking the language of science!