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Consider a cone shaped cavity of opening size (D) of 12 mm and 30 mm in depth (L) is machined on a diffuse, gray block having an emissivity of 0.7 and a uniform temperature of 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 of the cavity. (b) The effective emissivity leaving the cavity to that from a blackbody having the area of the cavity opening and a temperature of the inner surfaces of the cavity. Calculate the effective emissivity of the cavity described above. (c) For wall emissivities of 0.5, 0.7, and 0.9, plot from 1 to 10.


Consider a cone shaped cavity of opening size (D) of 12 mm and 30 mm in depth (L) is

machined on a diffuse, gray block having an emissivity of 0.7 and a uniform temperature

of 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 of

the cavity.

(b) The effective emissivity

leaving the cavity to that from a blackbody having the area of the cavity opening and

a temperature of the inner surfaces of the cavity. Calculate the effective emissivity of

the cavity described above.

(c) For wall emissivities of 0.5, 0.7, and 0.9, plot

from 1 to 10.


Grade:upto college level

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