A small oven consists of a cubical box of dimension L = 0.1 m, as shown. The

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A small oven consists of a cubical box of dimension L  = 0.1 m, as shown. The floor of the box consists of a heater that supplies P = 400 W. The remaining walls lose heat to the surroundings outside the oven, which maintains their temperatures at T= 400 K. A spherical object of diameter D = 30 mm is placed at the center of the oven. Sometime after the sphere is placed in the oven, its temperature is T= 420 K. All surfaces have emissivities of 0.4.

(a) Find the following view factors: F12, F13, F21, F31, F23, F32, F33.
(b) Determine the temperature of the floor and the net rate of heat transfer leaving the sphere due to radiation. Is the sphere under steady-state conditions?

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Fundamentals Of Heat And Mass Transfer

ISBN: 9780470501979

7th Edition

Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt

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