Applying high-emissivity paints to radiating surfacesis a

Chapter 13, Problem 13.108

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Applying high-emissivity paints to radiating surfacesis a common technique used to enhance heat transferby radiation.(a) For large parallel plates, determine the radiationheat flux across the gap when the surfaces are atT1?350 K, T2?300 K, ?1??2??s?0.85.(b) Determine the radiation heat flux when a verythin layer of high-emissivity paint, ?p?0.98, isapplied to both surfaces.(c) Determine the radiation heat flux when the paintlayers are each L?2 mm thick and the thermalconductivity of the paint is k?0.21 W/m?K.(d) Plot the heat flux across the gap for the bare sur-face as a function of ?s, with 0.05?s0.95.Show on the same plot the heat flux for thepainted surface with very thin paint layers andthe painted surface with L?2-mm-thick paintlayers.

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