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Force to maintain flow velocity

  1. May 21, 2009 #1
    1. The problem statement, all variables and given/known data

    A) what force is necessary to maintain 0.5 cm/s flow velocity of blood in the 20 cm long segment of aorta, supposing that the force is needed only to prevail the internal friction.

    The answer is 11.3 mN, I have no idea what formula to use. The blood viscosity=4.5mPa*s; blood density=1.05g/cm3

    B) What percentage intensity increase would cause a turbulent flow? Suppose the flow is stationary. [Pressure=1.6*10^4 Pa] The answer is 24%. Again I have nothing to contribute with here.

    2. Relevant equations

    3. The attempt at a solution

    A) I noticed that distance*velocity*viscosity give the right unit, but not answer, so I guess this is just a coincidence.

    B) Nothing

    I really have tried a long (!!) time to solve this, so I really hope that someone here can help me! The problem is that I do not have the means to solve it, I have no idea what formula to use or anything.
    Thank you for your time!
  2. jcsd
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