Surprising Science that Supercharges Your Fire - Bernoulli’s Principle in Action

[@felipedezotti5879]

I spent 5 years studying engineering + all the knowledge accumulated from life and KZbin videos, fell in love with hydrodynamics, went to work for a water supply and sewage company, did a lot of projects and just found out that I actually never truly learned Bernoulli's principle.Incredible explanation!!!

[@GreenhillForge]

Thanks! Yeah, it's a funny one. But when it clicks all sorts of other things click into place, at least for me. I love physics

[@Vikingwerk]

The small hole with fingers is a new trick to me, thanks!

[@wizbangdiving]

On the same line I use a drinking straw, which allows to give direction and some distance to the fire from your face. Helps heaps on damp days.

[@tikaanipippin]

My Mother used a simpler Bernouilli principle to encourage the fire by placing a sheet of newspaper over the fireplace,so that all the air went through the bottom of the hearth, through the coals, and up the chimney. The newspaper sealed itself around the fireplace as the suction increased and the fire burnt brighter. once it was clear the fire was burning fiercely, the paper was removed, rolled in a ball and added to the fire.

[@ebc1f7]

This is a fantastic video. There’s an inflatable air mattress that uses this principal and it inflated so much faster then normal ones that only use lung capacity. The mattress was meh but the feature was awesome. You have a fantastic ability to explain things my friend. Clear concise. Keep up the good work.

[@michaelheurkens4538]

This same principle is used to inflate emergency slides and liferafts in airliners. A CO2 cylinder could never inflate to the necessay volume fast enough to be of any use, so an "aspirator" with an incorporated venturi is used to accomplish this much like the garbage bag inflated when held at a stand-off distance. Great demo, by the way...

[@stevehaysham4678]

Excellent video. That last bit with the bag really clarifies it. Science always wins.

[@aaronjaben7913]

that fire blowing technique is gold

[@tatatatartine2588]

Random KZbin recommandation, but I am glad to have seen this. Cristal-clear explanation, very pedagogic, with demonstration... Bravo: I have learned something today, and in a way that I wont forget it. Thx!

[@lafamillecarrington]

I never realised it had such a significant effect - great demonstration.

[@savage6394]

You need to turn this into a “Short”. It would absolutely go viral. It's Incredible information laid out in an easily understandable way.

[@ABa-os6wm]

Filmimg vertically is a crime against humanity.

[@sergioelwing6442]

Man what a great video! Excellent explanation and demonstration, with no useless filler to pad the runtime.

[@cancel1913]

Best explanation on the Bernoulli effect i have yet seen.

[@Pc963It]

I'm amazed by your way of explaining this topic. When I studied physics, the only thing I remember is the name: Bernoulli, but now I can fully understand the principles, which I now believe were fundamental of Venturi's principles. I wish I had teachers like you

[@maximillianpatterson639]

We see this demonstrated in sailing and very dramatically. Great video

[@K12Reversal]

Wonderful explanation. I knew about Bernoulli's effect but never imagined this application. This opened my mind to several other uses. Thanks. 😊

[@Morbius1963]

I used to be a physics teacher. This was brilliant. The escape chutes on airliners use this effect too just as the black bags demonstrated.

[@mitesh8utube]

Finally, It makes sense to me how Venturi works. Thanks.

[@GreenhillForge]

yeah, venturi is a really great example of harnessing the principal. and super useful.

[@grumpy3543]

Now you know how the giant slide on an airliner can be filled with a tiny tank of nitrogen. There’s a Venturi and most of the air in that huge slide is from the outside air. 3:48

[@goatfiddler8384]

Me - Bachelor of Civil Engineering, Masters of Chemical Engineering that had a research project in Computational Fluid Dynamics, aka CFD, and all I can say is LEGEND!!!!!!! The pinched fingers is a top move. Great stuff!!!!!

[@GreenhillForge]

Thanks Mate!

[@Paladin7845]

Great Video!! What can be a complex principal in application, taught in a Concise, Simple, and EASY TO UNDERSTAND demonstrations!!

[@Karaon]

that blowing through fingers is a lifechanging tip

[@paulhare662]

Cool. I had to look because in 5th grade, my daughter and I did a wing/airfoil project for her science fair project. We even set up the "blow between two suspended paper cups" thing. Bernoulli is right up there with Fibinachi.

[@Pc963It]

Fibonacci (please! 🙏)

[@paulhare662]

@@Pc963It Flabby nacho.

[@user-sb3wh3dd4v]

Concise, accurate, clear demonstration with no BS. WELL DONE!

[@TheMadMagician87]

Brilliant demonstration with the bag, thanks for sharing :)

[@elpatosilva]

Very good video, the Bernoulli effect is one of many examples of how counterintuitive hydrodynamics is.

[@bodiddly12]

Thank you! I didn't fully appreciate the role of the Bernoulli Principle until I saw this video.

[@BlackmerStudios]

I just learned more in a couple of minutes than all the hours in science class!

[@niceguy191]

This effect is commonly used by backpackers when filling their air pad using an inflation sack. A quick blow of air towards the open sack fills it instantly, way faster than blowing directly in the pad's valve (and less moisture too)

[@Dmbyers2002]

Great video, blowing through a small hole in your fingers is a new trick to me but it makes sense!

[@realvanman1]

Thank you for not making this a “short”. I hate them and almost never watch them.

[@BudKash]

That's another thing, it's also how a vacuum generator works, driving a vacuum through a venturi with air pressure. We use them in automation systems to power robot end-effectors for picking up various objects, like semi-conductor wafers, or whatever we built an automation platform for manipulating with robots, where they can be used.

[@Lucian0093]

Wow, this is just a great video. Informative, on point, understandable examples, all day life use. I'm fascinated. 😮

[@nealesmith1873]

Great bag-filling technique!

[@SwedeEad]

Thanks to the You Tube Al Gore Rhythm Section for putting your channel in front of me! Lots of good stuff in here. And thank you for creating this!

[@f.demascio1857]

Great demonstration of the principle. Trying the finger tip technique tonight! No more "where's the darn blow pipe?"

[@holysmoke7043]

Thank you for this instruction.

[@Matt-d8m]

Learned something new! Thanks

[@wolfgangkranek376]

Great demonstration. On first glance it sounds counterintuitive, but looking closer it makes total sense.

[@stevehood10]

What a great explanation! Always found Bernoulli and venturi confusing.

[@roybatty2030]

This is why ships sailing parallel with each other can get sucked together if they get too close and fast, hence the need to steer slightly outwards to maintain a parallel path eg. when transferring personnel and equipment via cables.

[@tabula_rosa]

Also the waves push boats together even if they aren't moving because they're blocking the waves from getting between them. If two boats are aligned north-south like this | |, any wave that comes from the left ->| | and would push the right boat to the right & away, will first hit the left boat first and push it towards.

[@thomcdixon]

SCIENCE! awesome vid, thanks.

[@royster3345]

Like one of those moments you had back in school where you go "I never knew that" Every day a learning day 👍

[@affintlewoodlewix]

Now why did nobody teach me useful stuff like this at school? Very insightful and living with wood stoves that fingers trick is going to come in very useful.

[@GreenhillForge]

straws or the hollow part of a pen work really well too and if it's for home use you can just keep one by the stove

[@fxm5715]

Great little demo, clearly and simply explained, and I love the blowing through your fingers trick. I'll definitely be putting that one to use!👍

[@northidahodreaming5657]

a natural teacher!

[@slavkochepasov8134]

As one psychologist said: There is nothing more practical than a good theory. :)

[@ncooty]

Venturi effect

[@benjamineide6687]

Good explanation! Thx for your time.

[@daveh777]

Great video!!!!👍👍

[@robfox5562]

Outstanding video. 👍🏻

[@funkybongo00]

Thanks for that ! Nice short and to the point !

[@DrNickBailey]

Wow - this is quite revolutionary - what a great video. I have a fire on... so lets find out...

[@GreenhillForge]

report back my friend

[@DrNickBailey]

@@GreenhillForge I can't say that the finger trick worked for me, I think I'll stick to my pursed lips. But great explanation and demonstration in the videos.

[@GreenhillForge]

@@DrNickBailey NOOOOO! everyone look away.😅 I need more people to try it so we can have a poll of who it worked for

[@sciencetoymaker]

Well done, thumbs up!

[@overlordsshadow]

Tried teh small air hole with fingers... wow!

[@brent1387]

Very very cool…Thank-you !!!!

[@bruce-le-smith]

fantastic video, thank you!

[@k.chriscaldwell4141]

Great, however: The pressure decrease is the pressure perpendicular to the fluid’s flow-it’s dynamic pressure. And Bernoulli has nothing to do with lift generation over an airfoil/wing.

[@GreenhillForge]

Thanks! As I understand it, the "equal transit time theory" (basically the 100% bernoulli based theory) is definitely wrong concerning lift. But Bernoulli's equation is actually part of a more complex explanation of lift that together with Newton's second law and angle of attack do explain lift. If you know differently I'd love to hear about it so I could look into it. I always want to learn more if I misunderstand something.

[@k.chriscaldwell4141]

@ Bernoulli has nothing to do with lift generation. As an airfoil moves through the air, a vacuum is formed on its upper-rear surface. This vacuum pulls down air from above, which in turn pulls down more air (like a scoop.). All of this air is then accelerated down the airfoil’s trailing edge-opposite and equal creating lift. Because of the pressure deferentials involved, Bernoulli’s formulas are used as an approximation. As lift is Newtonian, an incredible fact then becomes clear.

[@BrandonAbel01]

Can you please go back in time and teach my highschool physics class?

[@TheIronHeadRat]

Great video, thanks for sharing 👍

[@1rober2]

Thank you that was very cool and helpful.

[@Count_Smackula]

Gonna have to try the small hole finger trick when I light my next fire.

[@ashleylaw]

And that is how the hurricanes are manipulated.

[@kylehayden8769]

Awesome! Great video

[@larstueschjth2658]

Like in a 'pump sack' for outdoor air mattress! 😉🤠

[@RobCardIV]

Why dont i remember my science teacher fucking doing this. he was cool and smart, his name was even Mr Snow, literally. I never 100 percent believed my grandfather when he tried to explain to me why airplane wings work. that they arnt riding on the air, but being pulled up from a lack of air pressure above. I believed him 98 percent, because he was an engineer. but no theory is flawless, we always have more to learn, i thought. this is a great, great demonstration of why im not 99 percent sure.

[@motormaker]

Great content.

[@gertmana1789]

Cool dude!

[@MichaelBarnes-ey7sj]

Too cool.

[@Joseph-Colin-EXP]

Whoa!

[@corvus1238]

Mr Bernoulli can be nefarious, he is responsible for slamming my front door when I open the back door.

[@alanjackson1015]

A straw does exactly the same thing and I never have one far from my fireplace

[@bruce-le-smith]

smart

[@joemccarthywascorrect6240]

I have several old retractable ballpoint pen bodies by my wood stove for that reason - they work a treat!

[@patrickohara1653]

To cool for school - Fantastic demonstration - I bet everyone who watches this will try blowing through their fingers next fire.

[@godislove8740]

Bernoueeeeeeeeeee! but thanks. nice vid

[@rawbacon]

That trash bag understands science better than me.

[@russellsullivan8947]

I read this comment before the trash bag showed up, thought you were insulting the guy in the video hahaha

[@paddyglenny]

What a great video, very informative. I'm intrigued by your location...I saw UK plug sockets on the wall but your accent seems North American. What's with that?

[@n085fs]

I question if the math is done correctly for the size of the exhaust vs the size of the intake for most combustion chambers. For my tankless water heater, the exhaust and intake pipes are the same diameter. This causes the intake air to be moving at a different speed than the exhaust. Is there any benefit to making them equal in airflow speed anyway? I don't know, but it's stuff I think about without knowing how to find out accurately.

[@GreenhillForge]

The supply and exhaust are basically never equal on a wood stove. And even if they were as soon as you adjust either the air supply or a damper on a flue they'd no longer be equal. The supply will always be smaller and therefore the air entering the stove will be faster which you can adjust to feed the fire as desired. The exhaust is then bigger so the air is moving more slowly which you want so that it lingers longer so you can extract more heat before it's gone. And both will be sized to suit the size of the firebox.

[@geobernadotte]

It would be really great if someone would come up with a bunch of simplified rule-of-thumb calculations for all this, just so that "ordinary" people get the basic ideas behind it. The first basic principle is the expansion of gases in relation to their temperature. As normal stoves depend on a draft from a chimney which is only a tiny fraction of the general air pressure, this parameter could be set as a constant (I think). As nearly 80% of air and also of the flue gases are Nitrogen, I would not bother to try to find out the exact consistence of the flue gases but just calculate with "normal" air values. You have an intake diameter where a certain volume of air at room temperature enters per time unit. This expands into the burn chamber. Here the burn gases should pass through at 500 to 800 °C for a minimum of 2 seconds for a clean and complete combustion. The expansion of air volume from room temperature to 800 °C is around 3.8 times. While loosing heat, the flue gases contract again. For modern stoves, there are numbers given for the needed draft, the exhaust temperature and the mass of the flue gases per time unit at the rated heating output. From all this, it should be possible to make some raw calculations, but so far, I failed with this myself.

[@garytango]

👍

[@janetcohen9190]

🎉🎉🎉

[@kerravonsen2810]

That is pretty cool! Or hot, as the case may be.

[@ericwilliams1659]

Musical instrument that takes advantage of Bernoulli's principle?

[@ericwilliams1659]

Bullroarer? - like in Crocodile Dundee films.

[@Jackofalltrades2x]

Hmmm 🤔 I always thought air coming out of a restricted hole is higher pressure.

[@GreenhillForge]

the high pressure is actually on the other side of the hole. like if you let the air out of a balloon, the air in the balloon is higher pressure and as it leaves the balloon through the hole the pressure of that air drops. hydrodynamics is often counterintuitive.

[@Iowa599]

needs a carburetor 😂

[@RobCardIV]

Sub'A'Lub'A;dubDUUUBBBEED. I started two hobbies at age 45. im not 46. Woodworking and fishing. I had no idea how wonderful they are. My first stool was great. my first chair was a total failure. my first table... well.. ill do better next time. Went fishing ten times before I caught a fish. I blame it on this boring city river in Nagoya. my first fish was a 40cm mullet ! it was huge .

[@celebvoncelebrus4429]

if you are not teaching physics, you're wasting your potential

[@WW5RM]

Im sorry but i have to disagree. Fluids cant be compressed like air! The flow characteristics of the two are completely different! Bernoulli's Principle is about fluid dynamics, pressure, density, speed and pressure differential typically in a closed system. Air in our atmosphere is completely different! Im pretty sure he said that flowing pressure decreases! Not that it creates "low" pressure, the pressure is still higher than 1 atmosphere or a positive / high pressure. You said "a low" pressure, maybe a lower pressure differential, that i would buy. The air coming out of the bellows or air nozzle is a positive pressure (compressed air or more than 1X atmosphere). The area around that high pressure is a lower pressure thus causing the rush of air / flow and it equalizes. Thus the reason you can fill the trash bag faster. To equalize, air must flow and leaving the bag open takes advantage of the equalizing air flow from our atmosphere. But what is coming out of the nozzle is still a higher pressure than 1 atmosphere or a positive pressure. Although while it is flowing and equalizing measuring its pressure in a atmosphere is difficult to do and is taking place at fractions of a second. But until it equalizes its still a positive pressure. Same as with a vacuum released into a atmosphere its just a negative pressure. For air to flow there MUST be a imbalance, either a positive or negative air pressure. A fan for example creates a positive pressure in the front and a negative pressure behind it. An air bellow is compressing air similar to how an air compressor does its just at a much lower pressure. More volume but less pressure.

[@timg745]

@WW5RM You're confusing fluids with liquids. Gasses are absolutely fluids and the Bernoulli principal 100% applies to gasses.

[@WW5RM]

@timg745 point taken, but for most of us, the difference between the two is irrelevant. My point is they can't be compressed. Their flow characteristics are completely different. Also, the air coming out of the nozzle of the belows is not "low" pressure. It's more than atmospheric pressure. The column of air surrounding the pressurized air coming out of it is a lower pressure. The air flow between the two differentials is equalization. Taking advantage of that air flow between the two is why the trash bag will fill up faster. NOT because the air coming out of the belows is low pressure as he described it in the video.

[@smurface549]

Actually, your explanation doesn't hold true for the air hose. If you have air under (high enough) pressure and release it through some orifice, the expelled air will reach Mach 1 (speed of sound) in the smallest cross section of the orifice, and the pressure in that point will be 0.5283 times the stagnation pressure (tank pressure, in this example). That means, as soon as the pressure in your air system is above 1.89 bars absolute (about 27.4 bananas), so every sensible air system, the pressure in the jet leaving the orifice won't be below ambient pressure anymore. That's just a physical fact, no way to argue around it. And therefore it can't suck in any of the surrounding air, if the reason would be how you explained it. What's happening in reality is a bit more complex. The contrary will happen, the air jet will expand and push air out of the way. But in that process it'll also transfer some of it's momentum to the surrounding air, dragging it along. And THAT effect might suck in more of the surrounding air. So, while the bag does in fact inflate much quicker with the air hose, the reason isn't what you have explained. Still you have given a really nice example that fluid dynamics are way less intuitive than people think. Bernoulli's principle is one of the most commonly used examples for an explanation that sounds completely logic, but isn't physically true (usually in the context of aircraft wings). The trick with the fingers is nice though. Didn't know about it, and I'll happily keep it in my repository for the next time I'll light a campfire 🙂

[@petejandrell4512]

This is really interesting and useful, I hope you don't mind but I'm going to give you some useful information too :) Start eating a carnivore diet, try it for 30 days. That's it.