Thermodynamics HW Solutions 640

Thermodynamics HW Solutions 640 - Chapter 8 Internal Forced...

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Unformatted text preview: Chapter 8 Internal Forced Convection decay of the local temperature difference. The error in using the arithmetic mean temperature increases to undesirable levels when differs from decay of the local temperature difference. The error in using the arithmetic mean temperature increases to undesirable levels when differs from T e T e T i by great amounts. Therefore we should always use the logarithmic mean temperature. 8-13C The region of flow over which the thermal boundary layer develops and reaches the tube center is called the thermal entry region, and the length of this region is called the thermal entry length. The region in which the flow is both hydrodynamically (the velocity profile is fully developed and remains unchanged) and thermally (the dimensionless temperature profile remains unchanged) developed is called the fully developed region. 8-14C The heat flux will be higher near the inlet because the heat transfer coefficient is highest at the tube inlet where the thickness of thermal boundary layer is zero, and decreases gradually to the fully developed...
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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