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 Newtonian fluids in a pipe of diameter ‘D’ & length ‘L’ incurring a pressure drop ‘Δp’ with average velocity ‘Vavg’ ?
A.	D Δp/8L
B.	D Δp/4L
C.	8 Vavg/D
D.	4 Vavg/D
Answer» D. 4 Vavg/D

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