Consider a cone shaped cavity of opening size (D) of 12 mm and 30 mm in depth (L) ismachined on a diffuse, gray block having an emissivity of 0.7 and a uniform temperatureof 1000degree C.?e of a cavity is defined as the ratio of the radiant power?e as a function of L/D over a range(a) Determine the view factor between the inner surface of the cavity and the opening ofthe cavity.(b) The effective emissivity leaving the cavity to that from a blackbody having the area of the cavity opening anda temperature of the inner surfaces of the cavity. Calculate the effective emissivity ofthe cavity described above.(c) For wall emissivities of 0.5, 0.7, and 0.9, plot from 1 to 10.

Shane Macguire , 11 Years ago

Grade upto college level