A furnace is shaped like a long semicylindrical duct of diameter D = 15 ft. The base and t...

A furnace is shaped like a long semicylindrical duct of diameter D = 15 ft. The base and the dome of the furnace have emissivities of 0.5 and 0.9 and are maintained at uniform temperatures of 550 and 1800 R, respectively. Determine the net rate of radiation heat transfer from the dome to the base surface per unit length during steady operation.

FIGURE P13–58E