A horizontal semitransparent plate is uniformly
Chapter 12, Problem 12.4(choose chapter or problem)
A horizontal semitransparent plate is uniformly irradi-ated from above and below, while air at T??300 Kflows over the top and bottom surfaces, providinga uniform convection heat transfer coefficient ofh?40 W/m2?K. The absorptivity of the plate to theirradiation is 0.40. Under steady-state conditions mea- surements made with a radiation detector above thetop surface indicate a radiosity (which includes trans-mission, as well as reflection and emission) ofJ?5000 W/m2, while the plate is at a uniform tem- perature of T?350 K. Determine the irradiation Gand the emissivity of the plate. Is the plate gray (???) for the prescribedconditions?
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