Fundamentals of Heat and Mass Transfer
Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 12, Problem 12.44P

Estimate the total, hemispherical emissivity ε for polished stainless steel at 800 K using Equation 12.43 along with information provided in Figure 12.17. Assume that the hemispherical emissivity is equal to the normal emissivity. Perform the integration using a band calculation, by splitting the integral into five bands, each of which contains 20% of the blackbody emission at 800 K. For each band, assume the average emissivity is that associated with the median wavelength within the band λ m , for which half of the blackbody radiation within the band is above λ m (and half is below λ m ). For example, the first band runs from λ = 0 t o λ 1 , such that F ( 0 λ 1 ) = 0.2 , and the median wavelength for the first band is chosen such that F ( 0 λ m ) = 0.1 . Also determine the surface emissive power.

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Chapter 12 Solutions

Fundamentals of Heat and Mass Transfer

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