Determine the conduction heat flux through various plane

Chapter , Problem 3.175

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Determine the conduction heat flux through various plane layers that are subjected to boundary temperatures of Ts,1 301 K and Ts,2 299 K at atmospheric pressure. Hint: Do not account for micro- or nanoscale effects within the solid, and assume the thermal accommodation coefficient for an aluminumair interface is t 0.92. (a) Case A: The plane layer is aluminum. Determine the heat flux q x for Ltot 600 m and Ltot 600 nm. (b) Case B: Conduction occurs through an air layer. Determine the heat flux q x for Ltot 600 m and Ltot 600 nm. (c) Case C: The composite wall is composed of air held between two aluminum sheets. Determine the heat flux q x for Ltot 600 m (with aluminum sheet thicknesses of 40 m) and Ltot 600 nm (with aluminum sheet thicknesses of 40 nm). (d) Case D: The composite wall is composed of 7 air layers interspersed between 8 aluminum sheets. Determine the heat flux q x for Ltot 600 m (with aluminum sheet and air layer thicknesses of 40 m) and Ltot 600 nm (with aluminum sheet and air layer thicknesses of 40 nm).