I am really grateful for this video. I am taking a course that just said, "make a venturi". So I googled it, wiki'ed it, and was still lost. A video is worth a trillion words. Well demonstrated. Thank you.
The principle is also used in old chemistry labs to provide vacuum for rotary evaporators. An adapter is connected to a faucet to create the vacuum. Wastes a good deal of water in the process.
Have been looking around for a good explanation of the Venturi effect since I've heard sports cars use it...this has been the most intuitive explanation I've found so far. Thanks! :)
You know the bucket of water with the hose pipe experiment you demonstrated, if you swapped the hose pipe with an airline like you used for the saw dust, I'm guessing that's what you're explaining? Water's way more dense than air, so the energy will dissipate and not push the water out as quick as water to water would... makes sense.
@@Johny40Se7en ⚠️ God has said in the Quran: 🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 ) 🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 ) 🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 ) 🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 ) 🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 ) ⚠️ Quran
It's specifically much more the venturi effect than the bernuli principle. The bernulli effect is about energy conservation, whereas this is about mixing of air streams. That's why a vernturi pump is a venturi pump, not a bernulli pump.
A Pelican fountain pen. Bought it in Germany Nice no nonsense fountain pens, work way better than the parker fountain pens (which are mostly for status)
You sir, are an artist and genius. I thoroughly enjoy your channel. Every video is a fascinating gem. Thank you for sharing your many varied creations.
Thank you good sir for demonstrating the venturi effect and giving a thorough explanation. It make a lot of sense now with what I am learning in the lab :)
Pelikan, with the regular blue Pelikan ink. Pelikan makes the best fountain pens. Plain, simple and relatively inexpensive, but they write way better than expensive Parker pens.
This is a fantastic video. I learn best with examples, and when learning a new concept, displaying several examples really paints the picture. Thank you.
In the sawdust (injection) pump, the compressed air pushes air out of the top section of the cylinder thereby reducing the pressure in the lower section, as you describe. It operates on the principle of induced current, not the Venturi effect (there is no Venturi tube). Likewise for the hose in the bucket. The flame thrower is an atomizer nozzle. While some atomizers use a Venturi tube, this one doesn't and relies solely on the Bernoulli effect.
I know this is an old video, but could the exhaust port of a vacuum be hooked up to the intake port of a vacuum to increase the suction effect using the Venturi effect? Or is there diminishing returns?
Excellent work; I'm going to use a clip of the first example with the paper tube for part of a presentation as an example of the venturi effect and how it relates to my research. Thank you!
By your reasoning, the direction that I blow the air wouldn't matter Bernoulli's principle is about conservation of energy in one flow, whereas this is about mixing of streams of fluid. Try thinking a bit more and parroting a bit less.
zakkyummms No need to be sarcastic, but then again you didn't say much either, I was making fun, and if you don't like it don't click that reply button.
I'm about to make up a new exhaust system for the car and I wondered if the angle of the very end of the tube, plays much of a part in better moving the exhaust gasses? Ie. a 45 degree angle (or less), coming out on one side with sliced section facing the 'wind' or with it facing away from the 'wind'. Just curious about how each might affect things. 2:10
Thanks for this - studying for a pilot’s license and this helped to (finally) conceptualize this. Got a video for aerodynamic lift / Bernoulli’s Principle?
That is also how a steam injector works for getting water pumped into a pressurized boiler (eg on a powerplant or a steam locomotive) and how a Giesl ejector creates a draft in the boiler of a steam locomotive. Airbrushes and many paint guns uses this to propel the paint.
Since your spray gun hose (straw) is placed in front of the compressed air nozzle, I would argue that the drop in pressure is caused by the Bernoulli Effect - fluids in an area moving faster than the the surrounding area possess less pressure. Since the air moving across the top of the straw is moving so quickly, the pressure drops and causes suction through the straw. Granted, I was a music major and my knowledge of the Bernoulli Effect is limited to its effect on vocal folds! Also granted, I had never heard of the Venturi Effect until just now. Thanks for learning me so good!
Matt Wallace Well, since all the air around me isn't moving either, I should then experience a tremendous vacuum from all the air that is not moving, according to your explanation.
Matthias Wandel Matt Wallace The Venturi effect is a subset/example of the Bernoulli Principal. Either can be explained by particle replacement or the pressure/speed-of-flow relationship. Matthias, going off of Matt's explanation, we do experience pressure (not vacumm) from the air that is not moving ~1 atm of pressure. That applied pressure is actually quite important for biological functions! Some people can actually feel pressure differences caused by storm systems because the pressure inside their body is not equalized properly and then the pressure differential is then felt as a force on their joints, for example.
Matthias Wandel Bernoulli's equation is a relation between speed and pressure along a single streamline, that is, a path taken by particles through the fluid. It's not valid in this case because Andrew is trying to compare different streamlines, and because the flow is unsteady. (In fact, the pressure in the jet is more or less atmospheric!) The suction is (as you stated) due to the deceleration of the jet due to turbulence, which causes a rising pressure gradient. Since the air at the far end of the tube is atmospheric, the air at the jet end is must be below atmospheric pressure, hence suction. Your friendly neighbourhood engineering student
+Matt Wallace Bernoulli: Fluid pressure is inverse to velocity. Venturi: Fluid pressure in a pipe reduces in a constriction. Since we are talking in very oversimplified terms (compared to actually modeling this with CFD and being realistic about what is happening here), the process would be: #1. The ID of the pipe is expanded when it exits the nozzle into the paper towel roll - most directly relevant to the Venturi principle which relates fluid pressure to pipe ID. #2. The high velocity fluid pushes out the air inside the paper towel roll, and this high velocity compared to the static atmospheric air creates a pocket of low pressure (Bernoulli- ish), which creates a pressure differential that moves air up to fill behind it. That relationship is also the result of the conservation of mass (mass flux in needs to equal mass flux out, the high velocity air going out x the cross sectional area needs to be equal to the velocity of the air entering x the same cross section). It is probably best to phrase this system in the context of the conservation of mass because applying Bernoullis has a lot of requirements, which they would not discuss in music. For example, Bernoullis only applies to inviscid flow, but all fluid is viscous so it will have viscous forces along the inner walls of the paper towel (in the boundary layer). So Bernoullis could only apply outside the boundary layer, and in a pipe this small the boundary layer is significant. Source: Fluid mechanics is a subset of mech engr, I have BSME, MSME
+CoolRiffz Not sure if i understand (english is not my native language...), but Bernoulli principle can be related with limitations in flow, derived from pressure drop (that comes from viscous limitations) and pressure gains (inputs, pumps, for example). So you can apply in every system, taking in account the real limitations on a system.
I think that's how carburetors work. The engine pulls in air by the vacuum created from the piston on the intake stroke, and then the flow of air causes the fuel to come up to be mixed with the air (like your spray gun example). :)
I get the venturi effect now. I've heard of it in a number of contexts all my life but, really did not know what it was exactly. What I see happening is that you're creating a relative low pressure zone in the top of the straw which creates a vacuum which draws up the liquid or gas. Very cool.
A question for you if I may. I'm wondering if you're riding a small carbureted vehicle up a hill that it cannot accelerate on, is it counter productive to hold the throttle wide open versus just open enough that the engine can fully use? I've always wondered if the airflow would draw the correct amount of gasoline naturally or if it's better to have the jet needle slightly blocking the main jet and restricting gasoline so the mixture is not too rich. I'm talking about the point where the throttle is equal to engine output versus wide open where you can definitely hear the vacuum. My understanding of the theory is the fuel will correctly mix with air based on air speed alone regardless of throttle position above current engine demand. Hopefully I'm clear enough. The furnace seems to support my thoughts though it's a bit reversed.
The explanation of what happens is accurate. This name of the effect is, however, turbulent mixing, not the Venturi effect. The Venturi effect is the decrease in pressure at a restriction according to Bernoulli's law. This can also be used to create a low pressure, but it does not require turbulence nor viscosity. Thanks for the demonstration.
Thank you Matthias for such a simple presentation of a complex scientific phenomena. Do you know if the Dyson bladeless fan, which is using the Venturi effect, is more efficient by thrust to power?
If you lower the pressure on that makeshift sprayer, you could probably sustain the flame without using the torch (though it would still have to be high enough pressure to make the fluid flow through the straw, so I'm not sure if that would work.)
What would happen if you did this in a vacuum where there is no air for it to mix with?? Would it still fan out or just be a laser like beam coming out the nozzle
FYI, this application of the Venturi effect is known as an injector, there is a neat Wikipedia article on such devices. They used to be used to pump water into the boilers of steam locomotives using high pressure steam from the boiler.
Hello, awesome video. I am trying to calculate the air intake flow rate related to the pressure drop. Should I just calculate the pressure drop inside the blower and then relate the pressure from the vena contracta with the atm pressure to calculate the intake? Thank you
As Matt Wallace pointed out, you have confounded Bernoulli's principle with the Venturi effect. Bernoulli's principle is that pressure decreases when velocity of a fluid increases. The Venturi effect is a consequence of Bernoulli's principle in the special case of a fluid flowing through a constricted pipe. It states that a fluid that does not compress will lose fluid pressure at the constriction. It results because the fluid must move faster in a narrow pipe than a wide pipe to move an equivalent volume which leads to a lower pressure by Bernoulli's principle. You provided some very neat demonstrations of Bernoulli's principle, and a couple of them may incidentally also involve the Venturi effect, but Matt Wallace is correct, this video should be titled "Bernoulli's Principle."
it doesnt create a negative pressure, it creates a low pressure zone in the fast moving air.. the ambient pressure in the straw is what pushes out to meet the lower pressure zone
just trying to help you keep it real. you created a lower pressure zone. vacuum does nothing, pressure does the work. dont you remember this from school?? in physics its good to get the terminology correct.
It's not pedantry to say your video is factually inaccurate. It might not seem important once you understand the principle but for kids or beginners coming into fluid dynamics the wrong terminology can really set them back in understanding the basics. They need to realise that it isn't 'negative' pressure, it is merely a lower pressure than the surrounding fluid.
Man I wish I was as smart as Matthias ... I could do fun crazy things like this without either burning myself, or burning the house down... I love watching you fun videos like this
hi, what a great video !! very interesting effect that a few people in the diy gas turbine forums are looking at, to use as a argumentation for there gas turbine engines. either running dry or using a afterburner.i was talking to someone in regards for using this to help the thrust on there jet powered gokarts .i really liked the way you explained it, and made it very clear. regards jon
Matt, I'm trying to understand the maximum force that can be exerted through the straw on your spraygun, do you know of an equation? I'm interested in using the venturi effect to spray aggregate free concrete, but would like to run the math to make sure it's possible to move that much weight, and if it is possible how much PSI I would need coming through the hose.
IIRC the Bernoulli equation relates the speed of a fluid to it's drop in pressure, assuming density and temperature are unchanged. The Venturi effect is when you constrict a fluid stream, causing the fluid speed to increase so the pressure drops. A jet of air is using entrainment to transfer momentum to the ambient air mass, and may be higher or lower pressure than ambient depending on the nozzle orifice. Basically, this video is showing a whole bunch of physical effects!
What you would have to do is downsize the size of the suction hose going to the insulation to create more vacuum force. You could make a venturi out of PVC pipe, and try the air from reversing a large vacuum, but I think you would most likely need compressed air to do it correctly.
Your a really smart and inspiring guy when I graduate from high school in gonna go for a degree in things like this thank you for all your knowledge and your videos are inspireing keep up the great work I hope to be like you someday p.s. your dad must have been very proud of the great work you do and all your accomplishments....take care and make a wooden fidget spinner plzzz i started a business making these things....
Matthias: I need to move about 18 inches of blow-in insulation from one part of my attic (approx 400 sqft) to another, and doing it by lifting & carrying would not work (the spaces are separated). Do you think I could aim a hose attached to the outlet side of my shop vac into the side of a larger hose (4"?) then suck the insulation from the "back" end of the 4" hose and blow it out the "front" end in the new location? Or a leaf blower instead of shop vac?
The Venturi effect is shown here. You have to have a high moving air stream for the Venturi effect to even take place hence the air compressor. Take the paper towel roll in the first part of video as the restriction or the narrow part in a closed tube system and the surrounding air around it as the larger tube that you described. The same principle is applied here.
Heating up a gas to combustion causes it to expand very quickly, the rushing of the excited gas and the pushing of the air around it causes it to make a noise, in other words an "explosion", when you atomize a flammable liquid with air it creates a lot of turbulence so rather than the whole thing being a big stable flame, it's lots of little explosions all at once with the added movement of the high pressure air you get a lot of them all at once, which is why it roars. Same thing as when you blow on a camp fire, heat up a stick enough... and it produces something called "wood gas" which sets on fire, you blow on the gas coming from the stick, it creates little air pockets mixed in with the gas...so rather than it being a stable fire (like a candle) the gas is blown around and sets on fire at different times with small "explosions" giving you a roaring fire (like when wind is blowing on it)
xthorpyx That same principle is happening in a greater scale with a thuner bolt where the changing in pressure is such due to the extreme heat that the air around it pass the sound barrier, hence " *CRKRRKRRKCKRRKKRRBRRRRRRRRoooowww* "
This is the same method used in those diesel "cannon" style space heaters, there is no high pressure fuel pump - at least for the cheap ones. Just a small air pump, sucking up fuel from the tank by ventury effect and mixing it with air. Just recently found this out after servicing one...
Great videos. I'm an amateur woodworker who's learning a lot thanks to them. In this video ("The Venturi Effect"), you used a fountain pen. What blue ink was in it? I use fountain pens, too, and I'm still looking for the "perfect" blue. The one you used looked good on camera. Just wondering. DPA
Sir Wandel this is my correction, Venturi effect describes drop of static pressure in fluid entering a narrower tube from a wider tube, Coanda effect describes a drop of pressure in ambient fluid around a jet of fast moving fluid I'm a big fan
I am really grateful for this video. I am taking a course that just said, "make a venturi". So I googled it, wiki'ed it, and was still lost. A video is worth a trillion words. Well demonstrated. Thank you.
My dude here from explaining the venturi effect to building a flamethrower
What a great video. I'm studying for the MCAT and having all these visual examples so much more effective than reading about in a text book.
lol cam here after CP FL2
@@musicrocksfu same tho
musicrocksfu woah holy shit same
@@musicrocksfu same lmaoo
Fl2 question 25?
I have never seen this topic explained like this before. The visuals you create are VERY clear and informative.
Actually, I filmed this during the drought. I hosed down the grass and the trees around before doing the flame experiments.
So basically does this Venturi effect help fan out for example fuel to help spread it out more easily if it’s either for liquid or gas fuels?
The principle is also used in old chemistry labs to provide vacuum for rotary evaporators. An adapter is connected to a faucet to create the vacuum. Wastes a good deal of water in the process.
Have been looking around for a good explanation of the Venturi effect since I've heard sports cars use it...this has been the most intuitive explanation I've found so far. Thanks! :)
Should have used this on the wasps
or spiders...
That's what I was about to say...
what have the spiders done?
+LemonSpy_ we are used to them. Everyone that visits has a heart attack
369 likes
The Bernoulli equation is based on conservation of energy, and energy is not conserved when fluids of different speeds mix.
You know the bucket of water with the hose pipe experiment you demonstrated, if you swapped the hose pipe with an airline like you used for the saw dust, I'm guessing that's what you're explaining?
Water's way more dense than air, so the energy will dissipate and not push the water out as quick as water to water would... makes sense.
@@Johny40Se7en ⚠️ God has said in the Quran:
🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 )
🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 )
🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 )
🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 )
🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 )
⚠️ Quran
Excellent visual display of the Venturi effect. Just what I needed!
Adding fire is always good.
It's specifically much more the venturi effect than the bernuli principle. The bernulli effect is about energy conservation, whereas this is about mixing of air streams. That's why a vernturi pump is a venturi pump, not a bernulli pump.
A Pelican fountain pen. Bought it in Germany Nice no nonsense fountain pens, work way better than the parker fountain pens (which are mostly for status)
The best explanation out of all the videos I saw. I like how your video is simple and to the point.
You sir, are an artist and genius. I thoroughly enjoy your channel. Every video is a fascinating gem. Thank you for sharing your many varied creations.
This video is great. I think I’ll check out more of his.
I never knew woodworkers could be this badass
Thank you good sir for demonstrating the venturi effect and giving a thorough explanation. It make a lot of sense now with what I am learning in the lab :)
I wanted to try it with sawdust, but it's really hard to ignite. I think if I had a bonfire to spray it into, it might work.
Pelikan, with the regular blue Pelikan ink. Pelikan makes the best fountain pens. Plain, simple and relatively inexpensive, but they write way better than expensive Parker pens.
The opening on the metal tube is about 1.5 mm in diameter. The numbers I quoted were to illustrate, I have no idea what the actual speed was.
This is a fantastic video.
I learn best with examples, and when learning a new concept, displaying several examples really paints the picture.
Thank you.
A sandblaster might have been worth mentioning.
That was the first thing that came to mind for me.
jet engin for me its how the after burner works if im not mistaken.
For me it's a carburetor
For ceramic glazing, you wouldn't want to use a real spray gun. That stuff is thick and abrasive, so the straw is an excellent idea.
Thanks!
People know about bernoulli, and think it applies to all flow situations. It doesn't.
Damn, I was wondering about the same. Could you please explain more
How does Bernoulli's principle not apply here?
This is awesome! Love the thorough explanations, diagrams, and most of all the demonstrations. Subbed.
This is the best video I have found on the Venturi effect
Your curiosity about just about everything is refreshing.
The fact that you explain how ik works makes it even more fun to watch!!!!!!!!!!!!
Fantastically clear and precise explanation. Thanks Matthias
In the sawdust (injection) pump, the compressed air pushes air out of the top section of the cylinder thereby reducing the pressure in the lower section, as you describe. It operates on the principle of induced current, not the Venturi effect (there is no Venturi tube). Likewise for the hose in the bucket.
The flame thrower is an atomizer nozzle. While some atomizers use a Venturi tube, this one doesn't and relies solely on the Bernoulli effect.
I know this is an old video, but could the exhaust port of a vacuum be hooked up to the intake port of a vacuum to increase the suction effect using the Venturi effect? Or is there diminishing returns?
No
Excellent work; I'm going to use a clip of the first example with the paper tube for part of a presentation as an example of the venturi effect and how it relates to my research. Thank you!
By your reasoning, the direction that I blow the air wouldn't matter
Bernoulli's principle is about conservation of energy in one flow, whereas this is about mixing of streams of fluid.
Try thinking a bit more and parroting a bit less.
Great video! Mattias, you have a talent at clearly explaining concepts. I would love more physics videos.
0:10
*Cocaine Snorting 101*
That comment was so very insightful. Please, I hope you continue.
zakkyummms No need to be sarcastic, but then again you didn't say much either, I was making fun, and if you don't like it don't click that reply button.
Thats joke
Watch "the most important meal of the day" by the minor prophets
r/woooosh@@zakkyummms
I'm about to make up a new exhaust system for the car and I wondered if the angle of the very end of the tube, plays much of a part in better moving the exhaust gasses? Ie. a 45 degree angle (or less), coming out on one side with sliced section facing the 'wind' or with it facing away from the 'wind'. Just curious about how each might affect things. 2:10
Thanks for this - studying for a pilot’s license and this helped to (finally) conceptualize this. Got a video for aerodynamic lift / Bernoulli’s Principle?
This looks like a bot reply... The video is bad science.
That hose-in-the-bucket thing blew my mind! Really cool effect.
That is also how a steam injector works for getting water pumped into a pressurized boiler (eg on a powerplant or a steam locomotive) and how a Giesl ejector creates a draft in the boiler of a steam locomotive. Airbrushes and many paint guns uses this to propel the paint.
Since your spray gun hose (straw) is placed in front of the compressed air nozzle, I would argue that the drop in pressure is caused by the Bernoulli Effect - fluids in an area moving faster than the the surrounding area possess less pressure. Since the air moving across the top of the straw is moving so quickly, the pressure drops and causes suction through the straw.
Granted, I was a music major and my knowledge of the Bernoulli Effect is limited to its effect on vocal folds! Also granted, I had never heard of the Venturi Effect until just now.
Thanks for learning me so good!
Matt Wallace Well, since all the air around me isn't moving either, I should then experience a tremendous vacuum from all the air that is not moving, according to your explanation.
Matthias Wandel Matt Wallace The Venturi effect is a subset/example of the Bernoulli Principal. Either can be explained by particle replacement or the pressure/speed-of-flow relationship.
Matthias, going off of Matt's explanation, we do experience pressure (not vacumm) from the air that is not moving ~1 atm of pressure. That applied pressure is actually quite important for biological functions!
Some people can actually feel pressure differences caused by storm systems because the pressure inside their body is not equalized properly and then the pressure differential is then felt as a force on their joints, for example.
Matthias Wandel Bernoulli's equation is a relation between speed and pressure along a single streamline, that is, a path taken by particles through the fluid.
It's not valid in this case because Andrew is trying to compare different streamlines, and because the flow is unsteady. (In fact, the pressure in the jet is more or less atmospheric!)
The suction is (as you stated) due to the deceleration of the jet due to turbulence, which causes a rising pressure gradient. Since the air at the far end of the tube is atmospheric, the air at the jet end is must be below atmospheric pressure, hence suction.
Your friendly neighbourhood engineering student
+Matt Wallace
Bernoulli: Fluid pressure is inverse to velocity.
Venturi: Fluid pressure in a pipe reduces in a constriction.
Since we are talking in very oversimplified terms (compared to actually modeling this with CFD and being realistic about what is happening here), the process would be: #1. The ID of the pipe is expanded when it exits the nozzle into the paper towel roll - most directly relevant to the Venturi principle which relates fluid pressure to pipe ID. #2. The high velocity fluid pushes out the air inside the paper towel roll, and this high velocity compared to the static atmospheric air creates a pocket of low pressure (Bernoulli- ish), which creates a pressure differential that moves air up to fill behind it. That relationship is also the result of the conservation of mass (mass flux in needs to equal mass flux out, the high velocity air going out x the cross sectional area needs to be equal to the velocity of the air entering x the same cross section). It is probably best to phrase this system in the context of the conservation of mass because applying Bernoullis has a lot of requirements, which they would not discuss in music. For example, Bernoullis only applies to inviscid flow, but all fluid is viscous so it will have viscous forces along the inner walls of the paper towel (in the boundary layer). So Bernoullis could only apply outside the boundary layer, and in a pipe this small the boundary layer is significant.
Source: Fluid mechanics is a subset of mech engr, I have BSME, MSME
+CoolRiffz Not sure if i understand (english is not my native language...), but Bernoulli principle can be related with limitations in flow, derived from pressure drop (that comes from viscous limitations) and pressure gains (inputs, pumps, for example). So you can apply in every system, taking in account the real limitations on a system.
"don't try this at home" has no impact on people trying it, and even if you try it and hurt yourself, it's your problem, not mine, regardless.
Thanks for the great explanation. 10 years in the making
This is great! I have a fog effect that is more effective is there is a gap between the nozzle and pipe I use for routing. Thank you for sharing.
I found no better explanation than this example, thanks.
I'm from Colombia!
Dude you are so smart I don't even know how you have made it this far... WOW. You are amazing!
I think that's how carburetors work. The engine pulls in air by the vacuum created from the piston on the intake stroke, and then the flow of air causes the fuel to come up to be mixed with the air (like your spray gun example). :)
I get the venturi effect now. I've heard of it in a number of contexts all my life but, really did not know what it was exactly. What I see happening is that you're creating a relative low pressure zone in the top of the straw which creates a vacuum which draws up the liquid or gas. Very cool.
A question for you if I may. I'm wondering if you're riding a small carbureted vehicle up a hill that it cannot accelerate on, is it counter productive to hold the throttle wide open versus just open enough that the engine can fully use? I've always wondered if the airflow would draw the correct amount of gasoline naturally or if it's better to have the jet needle slightly blocking the main jet and restricting gasoline so the mixture is not too rich. I'm talking about the point where the throttle is equal to engine output versus wide open where you can definitely hear the vacuum. My understanding of the theory is the fuel will correctly mix with air based on air speed alone regardless of throttle position above current engine demand. Hopefully I'm clear enough. The furnace seems to support my thoughts though it's a bit reversed.
carboureator not working right or fuel filter clogged
The explanation of what happens is accurate. This name of the effect is, however, turbulent mixing, not the Venturi effect. The Venturi effect is the decrease in pressure at a restriction according to Bernoulli's law. This can also be used to create a low pressure, but it does not require turbulence nor viscosity. Thanks for the demonstration.
Thanks for the fantastic quick explanations and demonstrations. I wish more more informative videos on youtube were of this quality
There's this tool called the Uniweld 40000 Sludge Sucker. Does this tool work on the same principle?
Nice video thank you.
Thank you Matthias for such a simple presentation of a complex scientific phenomena. Do you know if the Dyson bladeless fan, which is using the Venturi effect, is more efficient by thrust to power?
actually, the venturi effect is very inefficient. And the bladeless fan has a blower inside, which * surprise* has blades!
If you lower the pressure on that makeshift sprayer, you could probably sustain the flame without using the torch (though it would still have to be high enough pressure to make the fluid flow through the straw, so I'm not sure if that would work.)
Sir, that last bit was also a perfect demonstration of how an 'afterburner' in a jet engine works...spray fuel into the hot gas stream, and *WOOSH*!
What was the flammable liquid you sprayed? Awesome video. 😄
Crystal clear explanation 😃. It cleared all of my doubts.
Great job explaining in such a simplistic format!
But wrong.
Kind of new to your channel but love your work...Keep doing what your doing man!
I noticed you using a fountain pen there. On a different geeky subject, what model of pen was it and what ink? That looked like a nice blue.
Your neighbors must love you! Great explanation of the Venturi effect. Thank you
What would happen if you did this in a vacuum where there is no air for it to mix with?? Would it still fan out or just be a laser like beam coming out the nozzle
FYI, this application of the Venturi effect is known as an injector, there is a neat Wikipedia article on such devices. They used to be used to pump water into the boilers of steam locomotives using high pressure steam from the boiler.
Hello, awesome video. I am trying to calculate the air intake flow rate related to the pressure drop. Should I just calculate the pressure drop inside the blower and then relate the pressure from the vena contracta with the atm pressure to calculate the intake?
Thank you
Very Cool, I have a question what software have you used to processing your video ?
When you thought you knew how things work! I love looking at things with great detail, you often learn it's much more interesting than you thought!
But the explanation is incorrect. It is NOT the "venturi effect", but *entrainment* .
I really liked they way you explained it. Seen so many and was hard to grasp- you put it very easy. With fire -and math too :)
As Matt Wallace pointed out, you have confounded Bernoulli's principle with the Venturi effect. Bernoulli's principle is that pressure decreases when velocity of a fluid increases. The Venturi effect is a consequence of Bernoulli's principle in the special case of a fluid flowing through a constricted pipe. It states that a fluid that does not compress will lose fluid pressure at the constriction. It results because the fluid must move faster in a narrow pipe than a wide pipe to move an equivalent volume which leads to a lower pressure by Bernoulli's principle.
You provided some very neat demonstrations of Bernoulli's principle, and a couple of them may incidentally also involve the Venturi effect, but Matt Wallace is correct, this video should be titled "Bernoulli's Principle."
I came here from "Everything Wrong With Man of Steel".
Me too!
That shit is hilarious!
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Great video. Thanks. I saw a comment mentioning all your videos are very informative and good like this so I will be checking out more.
I think it is the same concept used in bunsen burners… To mix the gas with the air. Is it?
yep
it doesnt create a negative pressure, it creates a low pressure zone in the fast moving air.. the ambient pressure in the straw is what pushes out to meet the lower pressure zone
sorry, couldn't be bothered to make a version for pedantic types.
just trying to help you keep it real. you created a lower pressure zone. vacuum does nothing, pressure does the work. dont you remember this from school?? in physics its good to get the terminology correct.
It's not pedantry to say your video is factually inaccurate. It might not seem important once you understand the principle but for kids or beginners coming into fluid dynamics the wrong terminology can really set them back in understanding the basics. They need to realise that it isn't 'negative' pressure, it is merely a lower pressure than the surrounding fluid.
Pedantic? No. Accurate, yes.
zanick2 ]
Is this how the dyson air multipliers work? Is there a project in the works taking advantage of this?
How can I use this blowing mulch from a hopper? Thank you.
Man I wish I was as smart as Matthias ... I could do fun crazy things like this without either burning myself, or burning the house down... I love watching you fun videos like this
But the explanation is incorrect. It is NOT the "venturi effect", but *entrainment* .
which one is efficient? jet water pump or air compressor ?
I love this guy. Everyone needs a neighbor like that
hi, what a great video !! very interesting effect that a few people in the diy gas turbine forums are looking at, to use as a argumentation for there gas turbine engines. either running dry or using a afterburner.i was talking to someone in regards for using this to help the thrust on there jet powered gokarts .i really liked the way you explained it, and made it very clear. regards jon
Would a smaller straw make the flame hotter? Because then it gets more air and less fuel I suppose?
Matt, I'm trying to understand the maximum force that can be exerted through the straw on your spraygun, do you know of an equation? I'm interested in using the venturi effect to spray aggregate free concrete, but would like to run the math to make sure it's possible to move that much weight, and if it is possible how much PSI I would need coming through the hose.
You would need a VERY large compressor to do anything of the sort.
@@matthiaswandel How big are we talkin
I love this guy! So many great tutorials! Spreading the knowledge! Thanks!
This is awesome! Love the thorough explanations. Subbed.
always wondered about that phrase. are they suggesting you try it, just not at home?
IIRC the Bernoulli equation relates the speed of a fluid to it's drop in pressure, assuming density and temperature are unchanged. The Venturi effect is when you constrict a fluid stream, causing the fluid speed to increase so the pressure drops.
A jet of air is using entrainment to transfer momentum to the ambient air mass, and may be higher or lower pressure than ambient depending on the nozzle orifice.
Basically, this video is showing a whole bunch of physical effects!
I love how you are mixing things up. I love the vids
What you would have to do is downsize the size of the suction hose going to the insulation to create more vacuum force. You could make a venturi out of PVC pipe, and try the air from reversing a large vacuum, but I think you would most likely need compressed air to do it correctly.
Your a really smart and inspiring guy when I graduate from high school in gonna go for a degree in things like this thank you for all your knowledge and your videos are inspireing keep up the great work I hope to be like you someday p.s. your dad must have been very proud of the great work you do and all your accomplishments....take care and make a wooden fidget spinner plzzz i started a business making these things....
Matthias: I need to move about 18 inches of blow-in insulation from one part of my attic (approx 400 sqft) to another, and doing it by lifting & carrying would not work (the spaces are separated). Do you think I could aim a hose attached to the outlet side of my shop vac into the side of a larger hose (4"?) then suck the insulation from the "back" end of the 4" hose and blow it out the "front" end in the new location? Or a leaf blower instead of shop vac?
I'd like to know the brand and model of that pen...
The Venturi effect is shown here. You have to have a high moving air stream for the Venturi effect to even take place hence the air compressor. Take the paper towel roll in the first part of video as the restriction or the narrow part in a closed tube system and the surrounding air around it as the larger tube that you described. The same principle is applied here.
I wonder if u can make a oil burner with that setup
Where does the noise come from when you used the flammable liquid?
Heating up a gas to combustion causes it to expand very quickly, the rushing of the excited gas and the pushing of the air around it causes it to make a noise, in other words an "explosion", when you atomize a flammable liquid with air it creates a lot of turbulence so rather than the whole thing being a big stable flame, it's lots of little explosions all at once with the added movement of the high pressure air you get a lot of them all at once, which is why it roars.
Same thing as when you blow on a camp fire, heat up a stick enough... and it produces something called "wood gas" which sets on fire, you blow on the gas coming from the stick, it creates little air pockets mixed in with the gas...so rather than it being a stable fire (like a candle) the gas is blown around and sets on fire at different times with small "explosions" giving you a roaring fire (like when wind is blowing on it)
xthorpyx That same principle is happening in a greater scale with a thuner bolt where the changing in pressure is such due to the extreme heat that the air around it pass the sound barrier, hence " *CRKRRKRRKCKRRKKRRBRRRRRRRRoooowww* "
This is the same method used in those diesel "cannon" style space heaters, there is no high pressure fuel pump - at least for the cheap ones. Just a small air pump, sucking up fuel from the tank by ventury effect and mixing it with air. Just recently found this out after servicing one...
Might be true. But I wanted as long and big a flame as possible. I was actually kind of disappointed in the size of flame that I got!
This is exactly what I was looking for! Now I won't need to experiment as much. TY
Paint thinner. Tried gasoline first, but paint thinner was easier to ignite.
Great videos. I'm an amateur woodworker who's learning a lot thanks to them. In this video ("The Venturi Effect"), you used a fountain pen. What blue ink was in it? I use fountain pens, too, and I'm still looking for the "perfect" blue. The one you used looked good on camera.
Just wondering.
DPA
Where do you get your fountain pens? At least that's what I think you are using to write with.
Where was this for the wasps?
Sir Wandel this is my correction, Venturi effect describes drop of static pressure in fluid entering a narrower tube from a wider tube, Coanda effect describes a drop of pressure in ambient fluid around a jet of fast moving fluid
I'm a big fan
How can the Venturi effect be used to shoot an object at a supersonic speed? I mean, what happens if the compressed air-flow encounters a vacuum?