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hw04soln

# hw04soln - 1 A composite wall separates combustion gases at...

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Unformatted text preview: 1. A composite wall separates combustion gases at 2600°C from a liquid coolant at 100°C, with gas- and liquid-side convection coefficients of 50 and 1000 W/m 2 K. The wall is composed of a layer of beryllium oxide on the gas side 10 mm thick and a slab of stainless steel (AISI 304) on the liquid side 20 mm thick. The contact resistance between the oxide and the steel is 0.05 m 2 K/W. What is the heat loss per unit surface area of the composite? Sketch the temperature distribution from the gas to the liquid. Assume steady-state, one-dimensional heat transfer with constant properties. The thermal conductivities of the oxide and steel are 15 and 12.6 W/mK, respectively. Assumptions: Steady, 1D, constant properties, no generation Network analogy! T ∞ 1 T 1 T c 1 T c 2 T 2 T ∞ 2 1 1 h A A A L k A B B L k A 2 1 h A c R " A q ∴ A h 1 A k L A " R A k L A h 1 T T q 2 B B C A A 1 2 1 + + + +- = ∞ ∞ 2 B B C A A 1 2 1 h 1 k L " R k L h 1 T T A q + + + +- = ∞ ∞ We expect the temperature of Be oxide to be closer to T ∞1 . In table A2, highest k ....
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hw04soln - 1 A composite wall separates combustion gases at...

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