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

[@TheOrganicChemistryTutor]

Next Video: kzbin.info/www/bejne/jXPOaKB9l5yHgdk Final Exams and Video Playlists: www.video-tutor.net/

[@ይኩነኒ]

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]

OLIVE OIL.😃

[@demonslayer4607]

Your voice is soothing

[@christynovasio114]

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

[@matthewbrennan3127]

Should be Poseidon's Law

[@abdoulazizdabo9064]

It’s just the name, not a big deal

[@arianagm2332]

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

[@LawrenceNdelemani]

No

[@hornedlobster]

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

[@athiesobada7773]

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

[@ZULFERISYAHPUTRA]

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

[@yourfuturedocburenbeiya]

Excellent explanations as always! Thank you!!

[@sazkiaabuela791]

The best teacher🎉

[@bolekmellerowicz8441]

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

[@8tchprod.446]

fluids and gases preassure acts equally in all directions simultaniously

[@حسنناصرحمزةالعباسي]

Really helpful.Thanks very much

[@beinkoraa9818]

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

[@flowaagurl1396]

youre seriously the best

[@devpriysahu2223]

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]

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

[@bemnetanley982]

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

[@Mohamedezzeldin-k8h]

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

[@JamesVestal-dz5qm]

This is a specific application of the navier stokes equation.

[@dinarahal9165]

thanks a lot , you explain perfectly

[@Attalla-t9b]

Very great explanation!

[@sohansouri3928]

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

[@MrWookie21]

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

[@simranjoharle4220]

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

[@mmaandmedicine2563]

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]

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

[@defacto3208]

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]

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]

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]

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

[@princesspat5239]

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]

well maybe not constant speed but remain to flow*

[@rjtech-1993]

can we apply this to a pneumatic pressure lines

[@wizzyogwanz2750]

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

[@KY-dx7xd]

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]

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

[@ClearOutSamskaras]

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

[@Shreyas_Jaiswal]

Same doubt here.

[@aldrinjamesadriano2005]

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

[@ClearOutSamskaras]

@@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.

[@AbdoGAMing90]

Hello Where can I find more exercises on this topic?

[@DanielDuhon]

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

[@ishakklopic7281]

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

[@TUYISHIMIRE]

Good job

[@danahm6268]

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

[@HanafiMdoka]

Thanks sir

[@mnkgaming1958]

Is this ok for bsc maths

[@JamesVestal-dz5qm]

Exercise and veggies increase the diameter of the blood vessels.

[@jonathansanchez8802]

Let’s get those likes up!

[@potatoheaded1648]

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

[@holdmypotato3352]

hell yeah

[@alokdas7443]

What about the Discharge?

[@JamesVestal-dz5qm]

Important for blood vessels!

[@annikasvensson5600]

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

[@shishkabobby]

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.

[@cabalnest]

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]

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

[@MarkOConnor-qh9ik]

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

[@keatonrix2512]

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]

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

[@keatonrix2512]

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

[@kellyhighmore2982]

Right thanks

[@Freddy18w]

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

[@sccm100]

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

[@eileithyia6459]

haha good one honestly

[@grosstheman]

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

[@jaedamattis6606]

I actually love u

[@Androbench]

I get 60liters per minute what is that in psi

[@spreadpositivity-mg4em]

00:02 🙂🙂🙂🙂

[@ziyaoli410]

nice

[@musfikfahim1985]

better examples

[@JamesVestal-dz5qm]

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

[@king_matiwane]

The last part was very hard to assimilate

[@yuhengwu6853]

I love you

[@Animal-yb1rr]

I am calculating my dog's blood vessel area

[@Freddy18w]

i put in the same numbers & get 23.3

[@maymiller3639]

Puah ziyays Law

[@JamesVestal-dz5qm]

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

[@Freddy18w]

sorry I messed up .2 as .02

[@fordfiveohh]

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....

[@nguyenhoanganh5740]

Picture is covered by text

[@araleyousuf6003]

What is Q please answer me?

[@hoo1320]

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

[@ohdude8895]

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

[@Bamenglish5798]

F

[@FartingFlyingTurtle]

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

[@michelledsouza4100]

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

[@mithunrajpal]

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

[@knowledgeb00st]

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]

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