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Calculating pressure gradient

by corinnab
Tags: gradient, pressure
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Apr25-08, 11:53 PM
P: 9
a very dilute orange juice flows along a smooth tube (0.010m in diameter) with a maximum flow rate of 0.1m/s.
a) State the assumptions needed to solve the problem
b) Calculate the pressure gradient

Vmax = (Change in P * R^2)/(4*viscosity*L)

Reynolds number = (density*D*v)/viscosity

I am a bit confused about how to solve this as I havn't done any engineering before. This is what I have come up with so far:

a) Assume laminar flow - Reynolds number = 2100
Assume newtonian fluid
Assume density of dilute orange juice is same as for water.

b) Use Reynolds number to solve for viscosity. Then solve for change in pressure/L using Vmax equation.

Any help would be appreciated!
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