This makes perfect sense. The AquaTune Hydrogen Fuel system I recently instal in my car, uses Venturi Nozzles which enter the intake manifold of the engine at a 90 degree angle(as shown in your drawing). The low pressure draws distilled water through the AquaTune Processor, then Hydrogen generator, where Resonance and Frequency break the covalent bond of the water molecule. Thank You, Great Video.
More importantly however, the creator of this video failed to differentiate the fundamental difference between flow and velocity as these concepts pertain to fluids. Flow actually refers to volume per unit of time and velocity is length per unit time. With that said, I think I was able to convey the basic, qualitative nature of the Venturi effect as I was not focusing on the rigorous mathematical concepts. You make a fair point in any event.
You may be right but I think that is trivial though as his focus was more about pressure decrease which in essence is the most useful principle of the Venturi effect, like in carburators.
Wow! Soooo much to learn! I have been racking my brain, trying to design an ideal nacelle that incorporates the Bernoulli principle, in an effort to have increased thrust from an all electric powered "fan jet". I truly believe, that we can achieve increased thrust, use less energy, by using the Bernoulli principle vs. not using it.
I am using the Venturi force to feed to inject fertilizer into a drip irrigation system. Thank you for the video as a I was confused on how it all works.
That was a great video! Thanks for explaining that. I used a radiator fill mechanism today that creates a vacuum, and fills in the coolant channels with coolant- purged of air! I was shocked that my air compressor +pressure could create a vacuum. So I see the venturi effect now :-) I'll be a ME Junior in the fall, so haven't got to fluids yet.
The pressure reduction is due to the expanding exit and not the narrow part of the system. The width of the entry may not be important but the exit, the wide exit creates a sudden increased volume hence the reduced pressure. I would like to see the same experiment be done without the expanding exit and see if there will be any differences
well iam pleasently surprized how clear this teaching is and simply understandable I am kinda of excited about this study here for some reason and like to find out few things pls.. how can you maximize the suction of the outside atmospheric air into the venturi ... for example.. larger pipe size ? smaller venturi size? more smooth or rounder shape venturi? longer run of venturi pipe area? (btw does this work with gases as well as liquids)
Yes, the Venturi effect can apply to both gases and liquids as both are fluids and exhibit similar behaviour. The suction concept is a good question. In general, a bigger or wider opening of the entrainment port will allow for the entrainment of more fluid. Clearly, this will only work to a point. I am not sure about building suction systems and so on as I have little knowledge of engineering. You may look at engineering or fluid dynamics texts for this information or research manufacturers.
It seems that somebody else already noticed this but I want to point out that the flow is constant everywhere (the substance doesn't go anywhere). This is what creates the increased speed in the smaller section. Otherwise everything is perfect.
You are thinking Boyle's law and that law is good at looking at a gas in an isolated system. In fluid dynamics, we are talking about how a gas flows or acts as a fluid. Therefore, we are talking about very different concepts. The fluid is not being compressed into a smaller volume per se it is moving through a smaller area and in order to abide by the continuity principle, the velocity changes or kinetic energy increases and to maintain energy conservation, pressure decreases.
The explanation of this video seems to be incorrect. Why does the angle of the diverging tube produce low pressure when it is less than 15 degrees? If there is a Venturi tube on a very long tube, will the pressure at the small hole position in the narrow area still be lower than atmospheric pressure? I think it's impossible to go below atmospheric pressure.
Why would the atmosphere pressure be necessarily higher? If the air pressure in all three segments was high (if it was a high pressure system), then no air would be sucked in from the atmosphere, no?
I think it's easier to picture thinking about an airplane wing. The air on top of the wing has further to travel, so it goes faster, and hence is spread out, so lower pressure. The same thing is going on here, but it's a little harder to imagine because the smaller tube is constricted. Still, the basic point is the same, for the flow to get through the small pipe it has to go a lot faster, and hence there is less "air" at any particular moment, so less pressure. (Think cars on a highway.)
Hi, this is nicely done.. Just a question, why must it not be larger than 15degrees? Also lets say my flow rate Q1 is 220L/min and my P1 is 3MPa with D1 say 30mm. Now if I want to induce a vacuum so as to suck up some chemical, I can calculate D2. Now if I want to take the pressure back to say 3MPa do I just take the same D1 as D3 if it can be assumed that the chemical I induct is say 1L/min? I just dont understand the 15degrees? Thanks though
hi there,how the air is getting entrained...is it not a closed system.The revival of pressure is due to the increased area after venturi..this is my view...will u pls advise further.
Is angle theta coming from the third leg of a right angle triangle divided by two or does it just need to match up with P1's angle? Is there an optimal angle for theta?
Thank you for making such a great video! I have a question though. You say flow will increase at the constriction but don't you mean velocity?Flow and velocity are not the same thing. Flow should not change which is why velocity increases right? Flow maintains the same and in order to move the same volume of fluid, the velocity of that fluid must increase at the constriction as the pressure decreases. So in essence the flow is maintained and the velocity is increased in order to match flow, right? or am I way off?
I think it was just an inadvertent simplification for the masses that technically is a mistake. You are absolutely correct and thank you for clarifying that.
Yes I was gonna say it makes all the difference. Especially when you use the notation that was used, V with a dot above usually indicates volume flow rate.
Note that since the pressure P1 must be higher than atmospheric pressure (in order to get the fluid to flow through the venturi) the pressure drop at P2 may not be actually be enough for P2 to be below atmospheric pressure. Without measuring or calculating the pressure P2 all you can say for sure is that P2 is less than P1, not Patm.
Does the tube need to be cylindrical in cross section? Can it be rectangular? Can the area of the second tube after the restriction be removed, or must there be some tubing after the restriction?
The Bernoulli effect is basically an energy balance for non-viscous flow from point A to point B … when you introduce a hole (aka point C) in the constricted part of the pipe (aka venturi) can you use Bernoulli's eqn to describe flow from point A to point B?
i know with a car they sometime use the venturi effect with the air intake, the car factory makes things to small (to save on cost and weight of things) i know this im an auto tech, i also know changing the size of an exhaust pipe will help in many cases for better performance. my question how do i know what is to big or to small of a venturi size? what i want to do is make a more bigger one for my air intake system, how do i determine the size needed? thanks.. hope u understand what im saying.
@SMG516: FiO2 is known as the fraction of inspired oxygen. It is a measure of the percentage of oxygen in a certain gas mixture that will be inhaled by the patient.
Okay, I think the Venturi Effect is very easy to understand. But I am very skeptical about that "less than 15 degrees" part. I find it very hard to believe that anything in physics has hard hard line angle like that--it seems almost impossible to me. Maybe 15 degrees is some kind of optimum for some particular kind of fluid/air, but I cannot think of another instance with a hard number like that without some further explanation.
Hello, would love to reach out to you and ask whether this can be applied in building structures where I want air to vent out from the roof in increased pressure, only that the tube would be vertical. Perhaps you can provide email? That would be great and would highly appreciate it. Thanks!
But WHY does the pressure lower in the venturi? I know it has to do with fluid dynamics but never have I been able to get an explanation to WHY the pressure decreases in these points of the tube.
Check Bernoulli's principle. It is basically a specific case of energy conservation, which leads to the conclusion that if the speed of a fluid increases, the pressure decreases.
as velocity increases the fluid propagates towards the middle where there is less friction, aka path of least resistance. as it does this the pressure exerted on the inside diameter of the piping will decrease as the fluid is moving towards the center. the "contact time" between the wall of the pipe and the fluid is lessened as flow increases. the less time it has to press against the wall of the pipe the less pressure exerted. osdrog did what most do and just re-word the definition and not really explain anything.
Derek smith I like that you stick to the the term Velocity. Chris uses “Flow” and the reply above used “speed,” Bernoulli used Velocity (V), referring to the Velocity of the flow of the fluid. When being introduced to a new concept like this, it is more clear if either the single word Velocity, as you did, OR the whole whole phrase Velocity of Fluid Flow is used so that terms are not confused. I think when Chris uses “Flow is increased” that may leave some students to possibly confuse Velocity and Pressure which might result in them missing the whole point of Bernouli’s Principal and Venturi’s Description of The Effect. Otherwise this is a GREAT Video.
Loved the example. But instead of saying flow it’d be nice if you said velocity. Because the idea is to give persons an intuitive sense of how this works, ppl need not confuse flow rate staying constant with the changes in velocity.
i think i need an air flow meter or something to let me know how much air is moving past i dont know. i know with headers long ones give you top end power and shot ones low end power. will changing the lenght of the venrui help? if i make a small hole in the bottem of my venturi will it help? thanks
Dear friend can you tell me if i attach a small tube for the place where the venturi valve sucks the air and the other side of that tube is dipping in a water bucket approx one meter below the venturi valve will it sucks the water from the bucket ??
Could you help me out. What about 14 x 1/2in holes free-flow vs two small turbos that amount to a 20% increase each? I guess you could use the information one big turbo at 40% too. Would they parallel or would the hole provide no increase at low speeds?
Why does the pressure decrease isnt it a small space wouldn't the particles being constricted be constantly pushing against each other and the object constricting them
Research the continuity equation. For subsonic flow, cross-sectional area of fluid's flow path is inversely proportional to flow velocity. As the path through which the fluid flows becomes narrower, the molecules of the flow 'speed up' to pass through the constriction. More of the energy of the flow becomes kinetic, and that additional energy comes from the pressure energy. The pressure decreases and gives energy to movement.
GDarkGoombaG Not quite right. The molecules of the flow do not actually speed up. Instead, thermal energy gets changed to kinetic energy by orienting the vectors of the individual molecules into (nearly) the same direction as the flow. This decreases the temperature and pressure and increases the speed of the flow, but the speed of the molecules don't change. They just make more forward progress and collide less with their neighbors.
ok and why is the atmospheric pressure higher than than P2. lets say if P1 is 3bars and P2 is 1.5bars the atm.pr. is still lower with 1bar? --> no suckingi?
Hi Chris. Great video. Just a quick question. In the diagram you have in the video. What are V2 and P3 in comparison to V1 and P1? Are they greater? (In the diagram you said V2 decreases and P3 increases but this is before you talked about the hole in the contrisction), because at the end of the video (2.40) you said it increases the overall flow of air, hence i assumed that due to the venturi effect and the hole in the contriction, the overall flow of air at the end of the tube (velocity) increases? Hope I made sense ?
I'm wondering what is purpose the fluid exiting at an angle? As long as the fluid is going through a small channel at P2 should that not be enough to make the venturi work? What is it's function, is it to increase the pressure in P3 gradually as opposed to all at once? Is more air drawn in depending on how long the constriction chamber (P2) is? I have designed a venturi that goes through a T in a brass fitting using a cone end of a pen (for V1) I suppose the 'constriction' is happening like in your diagram... but there isn't enough time for the velocity to increase as there is no chamber that actually holds the water at a higher velocity like in your diagram... basically it's just flowing right from P1 back to P3 since there is no small union it is travelling through... My question is.... if I had a longer chamber at P2 would this increase the velocity and therefore draw more air/or water in from the venturi opening? Your response is appreciated.
Timothy Crusing From point 2 to 3, that is the case. At point 2, the velocity increases due to decreased cross-sectional area to maintain the same flow rate (mass flow is always constant for a steady state operation, and likewise volumetric flow provided the density of the transported stream remains constant). By representing points 1 and 2 with the Bernoulli equation, Pressure head (1) + Velocity Head (1) = Pressure head (2) + Velocity Head (2) + Friction Loss Head assuming horizontal flow. From this equation, a. The two sides must be equal b. The velocity head at (2) increases due to the reduced X-sectional area in the restriction c. Friction loss head is a positive quantity on the RHS (not required for this analysis, but included for completeness) Thus, the only way for (a) to be satisfied is for the pressure head at (2) to decrease.
Hi there, I just wanted to ask why does the decrease in cross-sectional area result in a decrease in pressure? Doesn't Pressure = forcre/area apply here, or is the velocity change such a dramatic increase (i.e large acceleration so larger force) that the reduction in area has a negligible effect?
f i o twos? 15 degrees? I'll keep looking. Why expanded - constricted - expanded, if it was just a delta in pressure you could poke the hole into just a constricted spot
Hello sir, Really nice vdo. And I have some question: 1) how to calculate the amount of air sucked inside (mass flowrate)the tube while the venturi effect is started? 2) how to calculate the negative pressure P2 that allowed the Patm sucked inside the tube? Please kindly let me know... Thanks.
Flow should never be used as a term that is interchangeable with velocity like this video has done. Flow is remaining constant throughout the pipe, but velocity is changing. Flow = Velocity * (Cross-sectional Area)
That kind of a doesnt make sense,because if we us venturi effect and mix atmospheric pressure with liquid,he says that the flow will increase,that sounds like a free energy source.How can a flow increase when the pressure source is the same and now your having air bubbles entering in the tube,that will prevent the liquid to pass trough the tube.I think that the pressure in this small area will be much further reduced,because air bubbles will reduce the water flow,but the velocity will increase.
the low static pressure is an effect of the second law of Newton and it's low pressure is just existing because of inertia. the low pressure in the venturi vent representing the inner core of a vortex. higher pressure from outside flow in the core and lifts the stream off into turbulence. the existance of a dynamic pressure instead is void. because people don't really look close enough to see the contradiction bernoulli causes to newtons laws of motion! look at my channel if you want the answer
The flow increases but the pressure decreases. Basically, the potential energy (pressure) is converted into kinetic energy (increased flow). This is why the pressure at P2 is lower, but the flow is higher.
Mechanical engineering masters student and from watching this ive finally understood how a spray bottle works thank you
I found this video very percise and helpful!! Thanks for making this video.
No problem, thanks for the comments. I think I may actually do a video about Q versus V to clear any confusion I may have caused.
This makes perfect sense. The AquaTune Hydrogen Fuel system I recently instal in my car, uses Venturi Nozzles which enter the intake manifold of the engine at a 90 degree angle(as shown in your drawing). The low pressure draws distilled water through the AquaTune Processor, then Hydrogen generator, where Resonance and Frequency break the covalent bond of the water molecule. Thank You, Great Video.
This just helped me understand the basic principle of the Venturi effect, thanks!
More importantly however, the creator of this video failed to differentiate the fundamental difference between flow and velocity as these concepts pertain to fluids. Flow actually refers to volume per unit of time and velocity is length per unit time. With that said, I think I was able to convey the basic, qualitative nature of the Venturi effect as I was not focusing on the rigorous mathematical concepts. You make a fair point in any event.
You may be right but I think that is trivial though as his focus was more about pressure decrease which in essence is the most useful principle of the Venturi effect, like in carburators.
Wow! Soooo much to learn! I have been racking my brain, trying to design an ideal nacelle that incorporates the Bernoulli principle, in an effort to have increased thrust from an all electric powered "fan jet". I truly believe, that we can achieve increased thrust, use less energy, by using the Bernoulli principle vs. not using it.
I cannot understand why in a constriction pressure decrease? Logically it should be more pressure there.
I am using the Venturi force to feed to inject fertilizer into a drip irrigation system. Thank you for the video as a I was confused on how it all works.
Brilliant. Thanks I can use this for my next project.
Very quality teaching in this video, thanks a lot!
That was a great video! Thanks for explaining that. I used a radiator fill mechanism today that creates a vacuum, and fills in the coolant channels with coolant- purged of air! I was shocked that my air compressor +pressure could create a vacuum. So I see the venturi effect now :-) I'll be a ME Junior in the fall, so haven't got to fluids yet.
The pressure reduction is due to the expanding exit and not the narrow part of the system. The width of the entry may not be important but the exit, the wide exit creates a sudden increased volume hence the reduced pressure. I would like to see the same experiment be done without the expanding exit and see if there will be any differences
well iam pleasently surprized how clear this teaching is and simply understandable
I am kinda of excited about this study here for some reason and like to find out few things pls..
how can you maximize the suction of the outside atmospheric air into the venturi ...
for example..
larger pipe size ?
smaller venturi size?
more smooth or rounder shape venturi?
longer run of venturi pipe area?
(btw does this work with gases as well as liquids)
Excellent excellent visual description
Yes, the Venturi effect can apply to both gases and liquids as both are fluids and exhibit similar behaviour. The suction concept is a good question. In general, a bigger or wider opening of the entrainment port will allow for the entrainment of more fluid. Clearly, this will only work to a point. I am not sure about building suction systems and so on as I have little knowledge of engineering. You may look at engineering or fluid dynamics texts for this information or research manufacturers.
It seems that somebody else already noticed this but I want to point out that the flow is constant everywhere (the substance doesn't go anywhere). This is what creates the increased speed in the smaller section. Otherwise everything is perfect.
yes he wrote V which is velocity of molecules in this case but was talking flow (Q), flow should be constant
You are thinking Boyle's law and that law is good at looking at a gas in an isolated system. In fluid dynamics, we are talking about how a gas flows or acts as a fluid. Therefore, we are talking about very different concepts. The fluid is not being compressed into a smaller volume per se it is moving through a smaller area and in order to abide by the continuity principle, the velocity changes or kinetic energy increases and to maintain energy conservation, pressure decreases.
Sir thank you so much
What that manipulating mean?
By manipulating the venturi effect
What does that mean?
The explanation of this video seems to be incorrect. Why does the angle of the diverging tube produce low pressure when it is less than 15 degrees?
If there is a Venturi tube on a very long tube, will the pressure at the small hole position in the narrow area still be lower than atmospheric pressure? I think it's impossible to go below atmospheric pressure.
Why would the atmosphere pressure be necessarily higher?
If the air pressure in all three segments was high (if it was a high pressure system), then no air would be sucked in from the atmosphere, no?
What happens if the restrictive tube is all there is, and is simply open to the atmosphere?
But how does this work with propane Gaz ? Is just an Hole to the tube which suck air from atmosphere?
Just out of interest if this hole structure was moving though the air at a speed of 200mph will the angels create drag causing the air flow to stall
Why does the pressure drop in the center?
I think it's easier to picture thinking about an airplane wing. The air on top of the wing has further to travel, so it goes faster, and hence is spread out, so lower pressure. The same thing is going on here, but it's a little harder to imagine because the smaller tube is constricted. Still, the basic point is the same, for the flow to get through the small pipe it has to go a lot faster, and hence there is less "air" at any particular moment, so less pressure. (Think cars on a highway.)
Hi, this is nicely done..
Just a question, why must it not be larger than 15degrees? Also lets say my flow rate Q1 is 220L/min and my P1 is 3MPa with D1 say 30mm. Now if I want to induce a vacuum so as to suck up some chemical, I can calculate D2. Now if I want to take the pressure back to say 3MPa do I just take the same D1 as D3 if it can be assumed that the chemical I induct is say 1L/min? I just dont understand the 15degrees?
Thanks though
hi there,how the air is getting entrained...is it not a closed system.The revival of pressure is due to the increased area after venturi..this is my view...will u pls advise further.
Is angle theta coming from the third leg of a right angle triangle divided by two or does it just need to match up with P1's angle? Is there an optimal angle for theta?
Thank you for making such a great video! I have a question though. You say flow will increase at the constriction but don't you mean velocity?Flow and velocity are not the same thing. Flow should not change which is why velocity increases right? Flow maintains the same and in order to move the same volume of fluid, the velocity of that fluid must increase at the constriction as the pressure decreases. So in essence the flow is maintained and the velocity is increased in order to match flow, right? or am I way off?
+Mariana Ehrlich you are right ! i am wondering why no one wrote it at the top since it is an obvious mistake
THANK YOU for pointing this out. It was bothering me the whole time.
As a converter furnace & scrubbing system operator, I cringed very hard when he said that. Thanks for pointing it out.
Thank you for your explanation. I could not understand it without your comment.
I think it was just an inadvertent simplification for the masses that technically is a mistake. You are absolutely correct and thank you for clarifying that.
So do you decrease the pressure of the entire atmosphere through a little bendy straw?
Yes I was gonna say it makes all the difference. Especially when you use the notation that was used, V with a dot above usually indicates volume flow rate.
Note that since the pressure P1 must be higher than atmospheric pressure (in order to get the fluid to flow through the venturi) the pressure drop at P2 may not be actually be enough for P2 to be below atmospheric pressure. Without measuring or calculating the pressure P2 all you can say for sure is that P2 is less than P1, not Patm.
i would say the same... without numbers you cant just say P2 is lower then atmosph.pressure ... so the video is bullshit?
@damokeena; I am glad you found the video helpful.
Does the tube need to be cylindrical in cross section? Can it be rectangular?
Can the area of the second tube after the restriction be removed, or must there be some tubing after the restriction?
thanks for video. please clarify that P1= P3 or P3> P1 if later is correct will be correct that P3=P2+ Atmospheric pressure? thanks
can this be used to increase gas pressure to a fire place? Are there standard products?
The Bernoulli effect is basically an energy balance for non-viscous flow from point A to point B … when you introduce a hole (aka point C) in the constricted part of the pipe (aka venturi) can you use Bernoulli's eqn to describe flow from point A to point B?
Why 15 degrees ?
Is 10 deg better than 5 deg?
If I don't make holes in the smaller tube
would the tube get colder ?
I thought so! The second he said that, I thought, wait, how can the flow be increasing? Thank you for verifying this for me.
i know with a car they sometime use the venturi effect with the air intake, the car factory makes things to small (to save on cost and weight of things) i know this im an auto tech, i also know changing the size of an exhaust pipe will help in many cases for better performance. my question how do i know what is to big or to small of a venturi size? what i want to do is make a more bigger one for my air intake system, how do i determine the size needed? thanks.. hope u understand what im saying.
We almost have a gadget at work almost exactly like that and we call it foam making branch 👨🏻🚒
@SMG516: FiO2 is known as the fraction of inspired oxygen. It is a measure of the percentage of oxygen in a certain gas mixture that will be inhaled by the patient.
Okay, I think the Venturi Effect is very easy to understand. But I am very skeptical about that "less than 15 degrees" part. I find it very hard to believe that anything in physics has hard hard line angle like that--it seems almost impossible to me. Maybe 15 degrees is some kind of optimum for some particular kind of fluid/air, but I cannot think of another instance with a hard number like that without some further explanation.
Just found this - very elucidating
Hello, would love to reach out to you and ask whether this can be applied in building structures where I want air to vent out from the roof in increased pressure, only that the tube would be vertical. Perhaps you can provide email? That would be great and would highly appreciate it. Thanks!
But WHY does the pressure lower in the venturi? I know it has to do with fluid dynamics but never have I been able to get an explanation to WHY the pressure decreases in these points of the tube.
Check Bernoulli's principle. It is basically a specific case of energy conservation, which leads to the conclusion that if the speed of a fluid increases, the pressure decreases.
as velocity increases the fluid propagates towards the middle where there is less friction, aka path of least resistance. as it does this the pressure exerted on the inside diameter of the piping will decrease as the fluid is moving towards the center. the "contact time" between the wall of the pipe and the fluid is lessened as flow increases. the less time it has to press against the wall of the pipe the less pressure exerted. osdrog did what most do and just re-word the definition and not really explain anything.
Derek smith I like that you stick to the the term Velocity. Chris uses “Flow” and the reply above used “speed,” Bernoulli used Velocity (V), referring to the Velocity of the flow of the fluid. When being introduced to a new concept like this, it is more clear if either the single word Velocity, as you did, OR the whole whole phrase Velocity of Fluid Flow is used so that terms are not confused. I think when Chris uses “Flow is increased” that may leave some students to possibly confuse Velocity and Pressure which might result in them missing the whole point of Bernouli’s Principal and Venturi’s Description of The Effect. Otherwise this is a GREAT Video.
Loved the example. But instead of saying flow it’d be nice if you said velocity. Because the idea is to give persons an intuitive sense of how this works, ppl need not confuse flow rate staying constant with the changes in velocity.
i think i need an air flow meter or something to let me know how much air is moving past i dont know. i know with headers long ones give you top end power and shot ones low end power. will changing the lenght of the venrui help? if i make a small hole in the bottem of my venturi will it help? thanks
Dear friend can you tell me if i attach a small tube for the place where the venturi valve sucks the air and the other side of that tube is dipping in a water bucket approx one meter below the venturi valve will it sucks the water from the bucket ??
I don’t know anything about this😢but I’m wondering if this has to be or explain the MY painting SPRAYER HVLP😳
can this apply to marbles spud gun chamber for increase blow pressure..can the atmosfera air mixed with output blow air in 1 second period
Could you help me out. What about 14 x 1/2in holes free-flow vs two small turbos that amount to a 20% increase each? I guess you could use the information one big turbo at 40% too. Would they parallel or would the hole provide no increase at low speeds?
Why does the pressure decrease isnt it a small space wouldn't the particles being constricted be constantly pushing against each other and the object constricting them
Research the continuity equation. For subsonic flow, cross-sectional area of fluid's flow path is inversely proportional to flow velocity. As the path through which the fluid flows becomes narrower, the molecules of the flow 'speed up' to pass through the constriction. More of the energy of the flow becomes kinetic, and that additional energy comes from the pressure energy. The pressure decreases and gives energy to movement.
thank you
GDarkGoombaG
Not quite right. The molecules of the flow do not actually speed up. Instead, thermal energy gets changed to kinetic energy by orienting the vectors of the individual molecules into (nearly) the same direction as the flow. This decreases the temperature and pressure and increases the speed of the flow, but the speed of the molecules don't change. They just make more forward progress and collide less with their neighbors.
Thank you! Very well explained!
Will it stop pulling air into the nozzle if pressure increases lets say to one thousand psi?
Finally I get it thanks for the video
Great explination!
hi, i have a question... if it is the case where the opening of the tube is less than 15 degree... can i say P2
Great! this told be allot about the venturi effect and added more to what I knew about it. (It also helped with my carburettor study :p)
Big pipe to small pipe...
Less flow more pressure
Correct or not???
where is the highest point of vaccum in just above the venturi, below or narrowest point of the venturi
Now I get it...!!!! Thanks
ok and why is the atmospheric pressure higher than than P2.
lets say if P1 is 3bars and P2 is 1.5bars the atm.pr. is still lower with 1bar? --> no suckingi?
Hi Chris. Great video. Just a quick question.
In the diagram you have in the video.
What are V2 and P3 in comparison to V1 and P1? Are they greater?
(In the diagram you said V2 decreases and P3 increases but this is before you talked about the hole in the contrisction), because at the end of the video (2.40) you said it increases the overall flow of air, hence i assumed that due to the venturi effect and the hole in the contriction, the overall flow of air at the end of the tube (velocity) increases?
Hope I made sense ?
I'm wondering what is purpose the fluid exiting at an angle? As long as the fluid is going through a small channel at P2 should that not be enough to make the venturi work?
What is it's function, is it to increase the pressure in P3 gradually as opposed to all at once?
Is more air drawn in depending on how long the constriction chamber (P2) is?
I have designed a venturi that goes through a T in a brass fitting using a cone end of a pen (for V1)
I suppose the 'constriction' is happening like in your diagram... but there isn't enough time for the velocity to increase as there is no chamber that actually holds the water at a higher velocity like in your diagram...
basically it's just flowing right from P1 back to P3 since there is no small union it is travelling through...
My question is.... if I had a longer chamber at P2 would this increase the velocity and therefore draw more air/or water in from the venturi opening?
Your response is appreciated.
I'd imagine that if you opened up in a right angle instead of a slope, you'd create turbulence
Hello, could you explain what is balloning effect in fluid flow? And also what is the effect in fluid flow in a annuli with excentricity? Thank you!
Is the angle really that important? Or will the fluid/gas become that angle to create the vacuum?
This might be a stupid question but why does flow increase and pressure decrease instead of pressure increasing and flow decreasing
Timothy Crusing From point 2 to 3, that is the case. At point 2, the velocity increases due to decreased cross-sectional area to maintain the same flow rate (mass flow is always constant for a steady state operation, and likewise volumetric flow provided the density of the transported stream remains constant). By representing points 1 and 2 with the Bernoulli equation,
Pressure head (1) + Velocity Head (1) = Pressure head (2) + Velocity Head (2) + Friction Loss Head
assuming horizontal flow. From this equation,
a. The two sides must be equal
b. The velocity head at (2) increases due to the reduced X-sectional area in the restriction
c. Friction loss head is a positive quantity on the RHS (not required for this analysis, but included for completeness)
Thus, the only way for (a) to be satisfied is for the pressure head at (2) to decrease.
Hi there, I just wanted to ask why does the decrease in cross-sectional area result in a decrease in pressure? Doesn't Pressure = forcre/area apply here, or is the velocity change such a dramatic increase (i.e large acceleration so larger force) that the reduction in area has a negligible effect?
Does P1=P3 with the pilot opening? how does the angle change the results?
Thank you.
What happens if when the tube opens back up, the gas encounters a vacuum?
holy shit. this is actually interesting.
f i o twos? 15 degrees? I'll keep looking. Why expanded - constricted - expanded, if it was just a delta in pressure you could poke the hole into just a constricted spot
good info-subscribed!
Thanks, I hope you find the videos helpful.
Thank you
Hello sir, Really nice vdo. And I have some question:
1) how to calculate the amount of air sucked inside (mass flowrate)the tube while the venturi effect is started?
2) how to calculate the negative pressure P2 that allowed the Patm sucked inside the tube?
Please kindly let me know... Thanks.
I am thinking of using this for a potery kilm
I never knew tampons were so technical happy flowing ladies.
thanks for the info, very helpfull
does it increase the air's temperature?
Hi sir, does this work for solid flow also? Meaning instead of water or air, it is dry powders.
I cant find any info on what happens to the temp of the mass at different points along the flow. Any basic info would he greatly appreciated.
Just seems like the restriction would be a high pressure area....sorry I'm new!
How does this link to ships and water displacement?
how does the increase the venturi effect?
I have a doubt the pressure P3 is greater than P2.. Wont there be a back flow?? I am not able to understand.. Plz help me out.. !!
MADDAMSETTI KOMAL MANIDEEP i believe it would flow in least resistance... the end of the tube on the right has lower pressure than p2
very nice!!
Flow should never be used as a term that is interchangeable with velocity like this video has done. Flow is remaining constant throughout the pipe, but velocity is changing. Flow = Velocity * (Cross-sectional Area)
That kind of a doesnt make sense,because if we us venturi effect and mix atmospheric pressure with liquid,he says that the flow will increase,that sounds like a free energy source.How can a flow increase when the pressure source is the same and now your having air bubbles entering in the tube,that will prevent the liquid to pass trough the tube.I think that the pressure in this small area will be much further reduced,because air bubbles will reduce the water flow,but the velocity will increase.
Y pressure decreases at p2? ?? Reason
Thank you so much Sir for explaining the Venturi Effect...
one more thing, What's FI02 (or O2)
good to apply in wind turbine design
Awesome thank you.
the low static pressure is an effect of the second law of Newton and it's low pressure is just existing because of inertia. the low pressure in the venturi vent representing the inner core of a vortex. higher pressure from outside flow in the core and lifts the stream off into turbulence. the existance of a dynamic pressure instead is void. because people don't really look close enough to see the contradiction bernoulli causes to newtons laws of motion! look at my channel if you want the answer
if the flow at p2 increases how come it is lower than p1?
The flow increases but the pressure decreases. Basically, the potential energy (pressure) is converted into kinetic energy (increased flow). This is why the pressure at P2 is lower, but the flow is higher.
To correct you guys, the #velocity# increases but the flow remains constant !
Is p3 greater thn p1
Still appreciated the video though.