During radiant heat treatment of a thin-film material, its shape, which may be hemispherical (a) or spherical

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During radiant heat treatment of a thin-film material, its shape, which may be hemispherical (a) or spherical (b), is maintained by a relatively low air pressure (as in the case of a rubber balloon). Irradiation on the film is due to emission from a radiant heater of area Ah = 0.0052 m2 , which emits diffusely with an intensity of Ie.h = 169,000 W/m2 . sr.


  (a) Obtain an expression for the irradiation on the film as a function of the zenith angle θ.

  (b) Based on the expressions derived in part (a), which shape provides the more uniform irradiation G and hence provides better quality control for the treatment process?

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Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

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