1.

For steady, fully developed flow inside a straight pipe of diameter D, neglecting gravity effects, the pressure drop Δp over a length L and the wall shear stress τw are related by

A. \({\tau _w} = \frac{{{\rm{\Delta }}pD}}{{4L}}\)
B. \({\tau _w} = \frac{\Delta p{D^2}}{4{L^2}}\)
C. \({\tau _w} = \frac{{{\rm{\Delta }}pD}}{{2L}}\)
D. \({\tau _w} = \frac{{4{\rm{\Delta }}pL}}{D}\)
Answer» B. \({\tau _w} = \frac{\Delta p{D^2}}{4{L^2}}\)


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