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Question: 2157 a plane wall of thickness l is subjected to...

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2-157 A plane wall of thickness L is subjected to convec- tion at both surfaces with ambient temperature Ts and heat transfer coefficient h, at inner surface, and corresponding T2 and h2 values at the outer surface. Taking the positive direction of x to be from the inner surface to the outer sur- face, the correct expression for the convection boundary condition is dT(0) dx (a) k = h170-1.)] (b) k dT(L) = h1rL)-7,21 dx dT(0) dx dTL (e) None of them 2-158
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