Poiseuille's Law - Pressure Difference, Volume Flow Rate, Fluid Power Physics Problems

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Күн бұрын

This physics video tutorial provides a basic introduction into Poiseuille's law. It explains how to calculate the pressure difference required to maintain a constant volume flow rate using poiseuille's equation given the coefficient of viscosity, the cross-sectional radius and the length of the pipe. It also explains how to calculate the volume flow rate and the mass flow rate given the pressure difference. Finally, it explains how to calculate the power required to maintain a constant volume flow rate with a given difference in pressure. This video contains plenty of examples and practice problems.
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Пікірлер: 97

@TheOrganicChemistryTutor Жыл бұрын

Next Video: kzfaq.info/get/bejne/jaibatB4x524e6s.html Final Exams and Video Playlists: www.video-tutor.net/

@user-op1xk2yz8d 2 жыл бұрын

I won't forget poiseuille's law again, since you have perfectly described the effect of cholesterol in our body using this law. Thank you so much!

@klam77 Жыл бұрын

OLIVE OIL.😃

@yourfuturedocburenbeiya 3 жыл бұрын

Excellent explanations as always! Thank you!!

@demonslayer4607 4 жыл бұрын

Your voice is soothing

@christynovasio114 3 ай бұрын

Love this, thank you for the fantastic explanation. Particularly the relationship of how vascular plaque increases cardiac workload

@user-lr7ey4qh6e 4 жыл бұрын

Really helpful.Thanks very much

@simranjoharle4220 6 жыл бұрын

Thank you so much......this really helped!

@dinarahal9165 3 жыл бұрын

thanks a lot , you explain perfectly

@hornedlobster 2 жыл бұрын

I came here to learn how to pronounce Pouiseuille, so thank you.

@flowaagurl1396 Жыл бұрын

youre seriously the best

@sazkiaabuela791 8 ай бұрын

The best teacher🎉

@user-hv6ef9ie1g 2 ай бұрын

Very great explanation!

@sohansouri3928 6 жыл бұрын

Best vedio ever 😍😘😍love u "O.Ctutor"#BEST

@matthewbrennan3127 4 жыл бұрын

Should be Poseidon's Law

@abdoulazizdabo9064 Жыл бұрын

It’s just the name, not a big deal

@arianagm2332 7 ай бұрын

LOL! AWW MAN... THEY MUST BE COUSINS 🐟🎣🐠🧜🏻‍♂️

@LawrenceNdelemani 2 ай бұрын

@athiesobada7773 2 жыл бұрын

Thank you for the video. No one know what is the 8 represent in the equation? Is it just a constant?

@TUYISHIMIRE 2 жыл бұрын

Good job

@ZULFERISYAHPUTRA 3 жыл бұрын

Dear Sir............Example Problem : One hydraulic cylinder, the end is connected to the Threaded rod so that it can be rotated. Cylinders with a bore size of 18 mm, 10 mm rod and a stroke of 300 mm single acting in a condition that is filled with oil. If the cylinder is rotated 10 mm. a. How to calculate it b. What is the gauge pressure

@rjtech-1993 4 жыл бұрын

can we apply this to a pneumatic pressure lines

@HanafiMdoka 2 ай бұрын

Thanks sir

@JamesVestal-dz5qm 10 ай бұрын

This is a specific application of the navier stokes equation.

@user-km5oy5sl3d 3 жыл бұрын

Do you hqve other examples about both poisselle formula and stock formula

@bolekmellerowicz8441 3 жыл бұрын

Thanks for the video. Does this equation only apply for horizontal pipes? What happens if is vertical?

@8tchprod.446 2 жыл бұрын

fluids and gases preassure acts equally in all directions simultaniously

@beinkoraa9818 2 жыл бұрын

I wish you to add an Arabic translation because we benefit from you a lot. Thank you

@jonathansanchez8802 4 жыл бұрын

Let’s get those likes up!

@jaedamattis6606 3 жыл бұрын

I actually love u

@MrWookie21 3 жыл бұрын

Academical science makes knowledge and humility Applied science makes money and greed Ideological science makes war and prejudice

@wizzyogwanz2750 Жыл бұрын

Thank you bro, for the lecture. You're just the best 🤌

@bemnetanley982 4 жыл бұрын

If there is f net there must be acclerate not constant velocity according Newton's 2 law?

@defacto3208 6 жыл бұрын

0:54 how can the fluid flows at constant speed if there is no pressure difference? (except if the constant speed is 0 of course). The flow is intrinsically defined by a pressure difference no ?

@hajarmouqadem7671 4 жыл бұрын

The fluid can flow at constant speed without a difference of pressure. However, the pressure difference causes the speed of the flow to change.

@VyvienneEaux 4 жыл бұрын

He was referring to an "ideal fluid" in which friction does not factor. I assume that the fluid, once already flowing, should continue to flow unless acted upon by an outside force (in this case internal friction), as stated in Newton's first law. However, in the real world, a fluid requires a pressure differential in order to continue to flow (as you stated).

@dyn274 4 жыл бұрын

You should know about Newton's first and second law. If we applied a difference pressure then velocity will change (accelerate or decelerate)

@princesspat5239 3 жыл бұрын

In an ideal fluid, there is no viscocity, therefore no friction due to the layers of fluid so the velocity will remain constant. However, ideal fluids are theoritical, in real life there is no such thing. So friction is present and therefore will cause the speed of the fluid to decrease but since in real life there is pressure difference, the pressure difference causes the real fluid to remain at constant speed.

@princesspat5239 3 жыл бұрын

well maybe not constant speed but remain to flow*

@alokdas7443 6 жыл бұрын

What about the Discharge?

@devpriysahu2223 5 жыл бұрын

1. When fluid is introduced at pressure p1 in pipe , flow through pipe causes pressure drop which is given by poiseullie’s equation P1- P2/R = Q Where R is resistance to flow factor = 8*x*L / (3.14 * r^4) X = coff of viscosity r = radius of pipe L= length of pipe So P2 = P1 - QR So more flow i will take more pressure will drop and I will get output flow at low pressure. Doubt 1 :- Physically it will look to me like following A) low flow (Q) high pressure (P2) condition - at outlet side velocity of water leaving would be higher B) High flow low pressure (P2) condition - at outlet side velocity of water leaving would be less Doubt 2 Or similarly someone tell me 2 cases Case 1 :- P1 = 4 kg/cm2 and P2 = 2kg/cm2 Case 2 :- P1 = 4Kg/cm2 and P2 = 1kg/cm2 In which case flow through pipe is higher ? My answer would be case 2 Is my answers in Doubt 1 and Doubt2 correct ???

@princesspat5239 3 жыл бұрын

As presure difference increases, q increases so case 2 has higher q (flow rate)

@AbdoGAMing90 5 ай бұрын

Hello Where can I find more exercises on this topic?

@ziyaoli410 3 жыл бұрын

nice

@potatoheaded1648 2 жыл бұрын

My man's carried me through act exam and even in uni he still carries me

@holdmypotato3352 4 ай бұрын

hell yeah

@JamesVestal-dz5qm 10 ай бұрын

Important for blood vessels!

@mmaandmedicine2563 3 жыл бұрын

9:53 my calculator gives me a different answer I know your answer is correct but are there any tips anyone has for inputting everything into a TI-30 calculator has been a problem for me since college

@jujubee3933 3 жыл бұрын

it helps to individually compute values with exponents, then writing them all down until you've computed all your values

@sccm100 3 жыл бұрын

6:00 I just ate three chocolate brownies. Thanks for reminding me

@eileithyia6459 3 жыл бұрын

haha good one honestly

@DanielDuhon 4 жыл бұрын

What about in a gas when p1=p2 but there’s a temperature difference?

@ishakklopic7281 5 ай бұрын

he will never answer you he made a video on patreon making fun of you

@mnkgaming1958 9 ай бұрын

Is this ok for bsc maths

@yuhengwu6853 Жыл бұрын

I love you

@grosstheman 4 жыл бұрын

How did you arrive at 716 I’m not receiving that value

@JamesVestal-dz5qm 10 ай бұрын

Exercise and veggies increase the diameter of the blood vessels.

@danahm6268 Жыл бұрын

guys does anyone know why he multiplied by A in minute 15:07? where did A come from?

@ClearOutSamskaras 2 жыл бұрын

What is the intuition or conceptual basis for the radius being put to a 4th power?

@Shreyas_Jaiswal 2 жыл бұрын

Same doubt here.

@aldrinjamesadriano2005 2 жыл бұрын

the provided formula is derived that is why it is raised by 4th power

@ClearOutSamskaras 2 жыл бұрын

@@aldrinjamesadriano2005 I took a hard look at it when I realized no answer was going to come. I basically concluded the same thing as you, though my wording and sentiment would be different than yours.

@maymiller3639 4 жыл бұрын

Puah ziyays Law

@cabalnest 4 жыл бұрын

can this equation be applied to air(concentration of air and oxigen ventilator)? what is the coefficient of viscosity of air (concentration of air and oxigen ventilator)?

@rogerroger7536 Жыл бұрын

Gasses viscosity is affected by temperature ,which is inversely proportional to temperature,whereas fluids is directly proportional

@MarkOConnor-qh9ik 18 сағат бұрын

@@rogerroger7536 Its the other way around. Liquid viscosity decreases with increased temperature i.e. inversely proportional while gas viscosity increases with temperature - directly proportional

@Freddy18w 2 жыл бұрын

my ti 30x displays 715.7. I used its pi key & did exponent first

@annikasvensson5600 2 жыл бұрын

Isn’t flow constant? When you say flow rate, do you mean speed? Correct me if I’m wrong, great video😄😄

@shishkabobby Жыл бұрын

The flow rate, which I will call Q, is not quite speed, which I will call v. I use v because I was trained in physic classes to use v as the magnitude of the velocity, which we also call speed. The speed is proportional to the flow rate. As he noted, Q = Av. Here, A is the cross sectional area of the tube, or pi r^2.

@MrCred_ 4 жыл бұрын

The last part was very hard to assimilate

@Androbench 2 жыл бұрын

I get 60liters per minute what is that in psi

@JamesVestal-dz5qm 10 ай бұрын

The heart has to work a lot harder to maintain the volume flowrate.

@keatonrix2512 Жыл бұрын

I don't know if I made a calculation error but the Reynolds number for the first example was over 400k so therefore Poiseuille's law wouldn't be applicable surely?

@kellyhighmore2982 11 ай бұрын

Can I ask How did you calculate the Reynolds number for this problem?

@keatonrix2512 11 ай бұрын

@@kellyhighmore2982 I did this ages ago so I don’t even remember 😅

@kellyhighmore2982 11 ай бұрын

Right thanks

@KY-dx7xd Жыл бұрын

The answer 716.2 Pa for Quiz #1 is wrong. Because the flow is a turbulent flow with the reynolds number of 477,600, it cannot use the Poisuille's law. Instead, you have to use the the Darcy-Weisbach equation. Therefore, the pressure difference is 69,500 Pa from the Darcy-Weisbach equation. Could you give me your opinion about my argument?

@kellyhighmore2982 11 ай бұрын

Can I ask how you calculated the Reynolds number for this problem?

@Freddy18w 2 жыл бұрын

i put in the same numbers & get 23.3

@musfikfahim1985 5 жыл бұрын

better examples

@spreadpositivity-mg4em 9 ай бұрын

00:02 🙂🙂🙂🙂

@Animal-yb1rr 2 жыл бұрын

I am calculating my dog's blood vessel area

@JamesVestal-dz5qm 10 ай бұрын

Every day my comments that are worthless become my own education. Another Bible engineering connection.

@Freddy18w 2 жыл бұрын

sorry I messed up .2 as .02

@nguyenhoanganh5740 3 жыл бұрын

Picture is covered by text

@ohdude8895 3 жыл бұрын

Did he have a heart attack at the last part??

@FartingFlyingTurtle 4 жыл бұрын

My father came to check what am I watcing, and I stopped video at 20s second. wasn't cool

@Bamenglish5798 Жыл бұрын

@fordfiveohh 5 жыл бұрын

The cholesterol that gets deposited in your arteries is like a scab... it has been sent there by your liver to repair your artery that was damaged from high blood viscosity.... The high blood viscosity can be caused by high hematocrit which can be caused by sleep apnea and smoking .... Both of which can cause stroke.... Another mechanism is a lack of collagen in the diet and a lack of vitamin C.... The vitamin C keeps the integrity of your arteries good... This prevents them from being damaged...that then prevents your liver from producing cholesterol to Band-Aid them... Which then will reduce your blood pressure.... Which then will reduce your risk of stroke....

@araleyousuf6003 2 жыл бұрын

What is Q please answer me?

@hoo1320 2 жыл бұрын

it's the flow rate, Arale & if you wonder what does a flow rate mean? then it's the amount of fluid that flows in a given time

@michelledsouza4100 4 жыл бұрын

Wait, what? Pawsiaes law? My sir pronounced it poesoolaes law and my whole class repeats after him.

@mithunrajpal 4 жыл бұрын

Your sir is correct. It’s not pawsiaes law.

@knowledgeb00st 5 жыл бұрын

Good but please don't imply other subjects' notions of which you don't know about. Cholesterol through diet is not directly linked to atherosclerosis and hearth disease. It is much more systematic than that

@BeethovenIsGod 4 жыл бұрын

Additionally, drinking warm drinks doesnt change temperature of your blood in any significant way. Of course you are adding heat to your body, however If hypothetically all the heat was added to your blood (which doesnt happen) and there was no loss due to evaporation, there would still not be any change in blood termperature. if you calculate Q=mct the amound of heat you would need to change blood volume one degree youd see that the heat of a hot coffee is not even close. Even if you could change your temperature by a few degrees, like getting a slight fever, it wouldnt change the viscosity in any meaningful way. However, i love your videos they are very helpful. Thanjs