Consider a circular tube of diameter D and length L, with a mass flow rate of .

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Consider a circular tube of diameter D and length L, with a mass flow rate of .

(a) For constant heat flux conditions, derive an expression for the ratio of the temperature difference between the tube wall at the tube exit and the inlet temperature, Ts(x = L) – Tm,i, to the total heat transfer rate to the fluid q. Express your result in terms of , L, the local Nusselt number at the tube exit NuD(x = L), and relevant fluid properties.
(b) Repeat part (a) for constant surface temperature conditions. Express your result in terms of , L, the average Nusselt number from the tube inlet to
the tube exit Nu, and relevant fluid properties.

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Fundamentals Of Heat And Mass Transfer

ISBN: 9780470501979

7th Edition

Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt

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