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Fall 2004 QUIZ
Tuesday, September 21, 2004 -.. ' The steady-state, one-dimensional temperature distribution in a composite wall, made of
slabs of three different solid materials, is shown below. Each material has a constant, but
different, thermal conductivity k. The heat ﬂuxes q” within each material are indicated in
the diagram. ' (.0 «3% - if) 553
l a) What is the relative magnitude of qB” and qc”? b) How does qA” vary with distance? 0) What is the relative magnitude of qA” and qB” at position 2?
d) What is the relative magnitude of kg and kc? e) What is the relative magnitude of 19; and k3? f) Sketch a plot of q” versus x labeling the positions 1, 2, 3, and 4 and showinq qA”,
QB” and QC”- - g) What is likely to be to the left of‘positioln x? What else mightbe there? h) The region to the right of slab c is a ﬂuid with heat transfer coefﬁcient h and temperature far from position 4 of TN. Write an expression relating surface temperature T4, Tn, kc, and ET- in slab 0. dx ...
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- Fall '04