The directional total emissivity of nonmetallic materials may be approximated as , = n, cos , where
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The directional total emissivity of nonmetallic materials may be approximated as εθ, = εn, cos θ, where εn, is the normal emissivity. Show that the total hemispherical emissivity for such materials is 2/3 of the normal emissivity.
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Related Book For
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine
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