Turbulent flow velocity profiles

  1. i've been given this question by my lecturer at university and im struggling with where to start with it to be honest. it feels like i don't have enough information. please can someone help?

    For turbulent flow, the velocity profile inside a duct and a pipe of diameters Dd and Dp and
    both with distance y from the centre line is: vy/vy=0 = (1-y/r)1/7, where vy=0 = vmean/0.817 and vmean=Q/A. Plot the velocity profiles for:

    (a) Air flowing in a duct measuring Dd = 0.6m and with Re = 105.
    (b) Water flowing in a pipe measuring Dp = 0.5m and with Re = 105.
    (c) Calculate the vmean and vy=0 for both cases (a) and (b)
    (d) If the Blasius equation f = 0.079Re-0.25 applies, calculate the values of f and ΔP/L for (a)
  2. jcsd
  3. http://en.wikipedia.org/wiki/Reynolds_number

    You have to find the kinematic viscoscity from your textbooks or online.

    You have enough. Assume hydrauilic diameter is the the same as actual diameter.
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