A cylindrical cavity is closed at the
bottom and has an opening centered in the top surface. A cross section of this
configuration is shown in the sketch. For the conditions stated below,
determine the rate of radiant energy passing through the 5-mm-diameter cavity
opening. What will be effective emissivity of the opening?
a. All interior surfaces are black at 600
b. The bottom surface is diffuse-gray with , and has a temperature
of 600 K. All other surfaces are reradiating.
c. All interior surfaces are diffuse-gray
with and are at a
uniform temperature of 600 K.
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