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
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