Fluid Mechanics seventh edition by Frank M. White · Problem P6.8

Viscous Flow in Ducts — Frank M. White

Physics — Fluid Mechanics · internal-external-flow

Problem

When water at 20°C is in steady turbulent flow through an 8-cm-diameter pipe, the wall shear stress is 72 Pa. What is the axial pressure gradient ∂p/∂x\partial p/\partial x if the pipe is (a) horizontal and (b) vertical with the flow up?

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