What is the shear rate at the pipe wall, in case of laminar flow of Ne – McqOptions

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1.	What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter ' D ' & length ' L ' incurring a pressure drop '? p ' with average velocity ' V avg '?
A.	D ? p /8 L
B.	D ? p /4 L
C.	8 . V avg / D
D.	4 . V avg / D
Answer» D. 4 . V avg / D

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