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




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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  • Let’s get those likes up!


  • The last part was very hard to assimilate


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


  • https://wiki.anton-paar.com/en/water/


  • can we apply this to a pneumatic pressure lines


  • 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)?


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


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


  • Should be Poseidon's Law


  • Really helpful.Thanks very much


  • Is blood really a Newtonian fluid with laminar flow? I'll be surprised if that's the case.


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


  • Your voice is soothing


  • 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 ???


  • NoorNoor

    Author Reply

    Thank you


  • 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….


  • You're right about everything except cholesterol in the diet…. Cholesterol and triglycerides are actually caused by carbohydrates… if you don't believe it going to low carbohydrate diet then check your cholesterol…. You can correct your cholesterol with a low carbohydrate diet…I did… I also increase my cholesterol with a high-carbohydrate diet…. Believe what you want…


  • better examples <3
    but I need the proof of Poiseuilles equatin in more better way.


  • 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


  • is it possible that using this, one can only get change in "volume" using pressure difference and blood flow(deltaV/Delta T)?


  • Would you use absolute visocsity or kniematic viscosity and should they always be used with units of Pa*s because I thought it was untiless?


  • 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 ?


  • Thank you so much……this really helped!


  • What about the Discharge?


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