A device that recovers heat from
Chapter 8, Problem 8.84(choose chapter or problem)
A device that recovers heat from high-temperaturecombustion products involves passing the combustiongas between parallel plates, each of which is main-tained at 350 K by water flow on the opposite surface.The plate separation is 40 mm, and the gas flow is fullydeveloped. The gas may be assumed to have the proper-ties of atmospheric air, and its mean temperature andvelocity are 1000 K and 60 m/s, respectively.(a) What is the heat flux at the plate surface?(b) If a third plate, 20 mm thick, is suspended midwaybetween the original plates, what is the surface heatflux for the original plates? Assume the tempera-ture and flowrateof the gas to be unchanged andradiation effects to be negligible.
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