Chapter 8 Internal Forced ConvectionLaminar and Turbulent Flow in Tubes 8-26CThe friction factor for flow in a tube is proportional to the pressure drop. Since the pressure drop along the flow is directly related to the power requirements of the pump to maintain flow, the friction factor is also proportional to the power requirements. The applicable relations are ΔΔPfLDVWmP==ρ22and pump&&8-27CThe shear stress at the center of a circular tube during fully developed laminar flow is zero since the shear stress is proportional to the velocity gradient, which is zero at the tube center. 8-28CYes, the shear stress at the surface of a tube during fully developed turbulent flow is maximum since the shear stress is proportional to the velocity gradient, which is maximum at the tube surface. 8-29CIn fully developed flow in a circular pipe with negligible entrance effects, if the length of the pipe is doubled, the pressure drop will also double(the pressure drop is proportional to length).
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