The hemispherical cavity shown in the figure has an inside surface temperature of 700 K. A plate

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The hemispherical cavity shown in the figure has an inside surface temperature of 700 K. A plate of refractory material is placed over the cavity with a circular hole of 5 cm diameter in the center. How much energy will be lost through the hole if the cavity is
a. black?
b. gray with an emissivity of 0.7? 

What will be the temperature of the refractory under each condition?
15-cm radius

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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