An opaque, horizontal plate has a thickness ofL21 mm and
Chapter 12, Problem 12.69(choose chapter or problem)
An opaque, horizontal plate has a thickness ofL?21 mm and thermal conductivity k?25 W/m?K.Water flows adjacent to the bottom of the plate and is at a temperature of T?,w?25C. Air flows above the plate at T?,a?260C with ha?40 W/m2?K. The top of the plate is diffuse and is irradiated withG?1450 W/m2, of which 435 W/m2is reflected. The steady-state top and bottom plate temperatures are Tt?43C and Tb?35C, respectively. Determine the transmissivity, reflectivity, absorptivity, and emis-sivity of the plate. Is the plate gray? What is theradiosity associated with the top of the plate? What isthe convection heat transfer coefficient associatedwith the water flow?
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