Hi there, I was wondering if you could help me with the following questions. 1.

Question

Hi there, I was wondering if you could help me with the following questions.

1. Will a fluid reach equilibrium when subjected to a steady state stress?
2. Does the distribution of shear stress for lamina flow, vary parabolically with the radius of the pipe?
3. Is the Reynolds number a measure of the ratios of the inertial forces to the viscous forces?
4. If the width is D and breath is 3D, is the hydraulic diameter of the full rectangular pipe 2D?
5. Is a friction factor a dimensionless wall shear stress?
6. For laminar flow in a horizontal pipe, under a constant pressure gradient, doe the doubling of the diameter result in a doubling of the flow rate?
7. For a rough pipe, does the friction factor keep on decreasing when the Reynolds number increases?
8. For a given volumetric flow rate, Q, is the pressure drop in turbulent flow approx. proportional to 1/(D^5) where D= diameter, ?

Thanks,
Rebecca

Explanation / Answer

I figured some out. 3. Yes it is. 4. No where Dh= 4A/P where P=wetted perimeter. It would equal 3D/2 5. Yes, The Fanning FF is defined as such 7. Yes according to the Moddy chart Unsure about 1,2,6 and 8 still

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