Thermodynamics HW Solutions 646

Thermodynamics HW Solutions 646 - Chapter 8 Internal Forced...

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Chapter 8 Internal Forced Convection Laminar and Turbulent Flow in Tubes 8-26C The 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 Δ Δ Pf L D V W mP == ρ 2 2 and pump & & 8-27C The 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. 8-28C Yes, 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. 8-29C In 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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