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# 5-11 - 296 Finite Element Analysis and Design 11 Find the...

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296 Finite Element Analysis and Design 11. Find the heat transfer per unit area through the composite wall in the figure. Assume one-dimensional heat flow and there is no heat flow between B and C. The thermal conductivities are k A = 0.04 W/m/ o C, k B = 0.1 W/m/ o C k C = 0.03 W/m/ o C, and k D = 0.06 W/m/ o C. Solution: From the assumption of one-dimensional heat flow, the problem can be modeled as a discrete system in the figure. Element A: (1) 1 1 (1) 2 2 0.16 0.16 0.16 0.16 T q T q       Element B: (2) 2 2 (2) 3 3 0.06667 0.06667 0.06667 0.06667 T q T q       Element C: (3) 2 2 (3) 3 3 0.02 0.02 0.02 0.02 T q T q  

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5-11 - 296 Finite Element Analysis and Design 11 Find the...

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