
#1
Apr1711, 03:31 PM

P: 3

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 = (1y/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 = 0.079Re0.25 applies, calculate the values of f and ΔP/L for (a) 



#2
Apr1911, 02:48 AM

P: 21

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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