A horizontal structure consists of an L A = 10-mm-thick layer of copper and an L B

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A horizontal structure consists of an L= 10-mm-thick layer of copper and an L= 10-mm-thick layer of aluminum. The bottom surface of the composite structure receives a heat flux of q" = 100 kW/m2, while the top surface is exposed to convective conditions character characterized by h 40 W/m· K, T∞ = 25°C. The initial temperature of both materials is Ti,A  = Ti,B  = 25°C, and a contact resistance of R"t,c = 400 X 10–6 m2 · K/W exists at the interface between the two materials.

(a) Determine the times at which the copper and aluminum each reach a temperature of Tf  = 90°C. The copper layer is on the bottom.
(b) Repeat part (a) with the copper layer on the top.

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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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