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Question
For steady, fully developed flow inside a straight pipe of diameter D, neglecting gravity effects, the
pressure drop ∆p over a length L and the wall shear stress tw are related by
Options:
A .  tw = ∆pD/4L
B .  tw = ∆pD2/4L2
C .  tw = ∆pD/2L
D .  tw = 4∆pL/D
Answer: Option A


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