In Problems 12.19 and 12.20, we estimated the earth's surface temperature, assuming the earth is black. Most
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In Problems 12.19 and 12.20, we estimated the earth's surface temperature, assuming the earth is black. Most of the earth's surface is water, which has a hemispherical emissivity of ? = 0.96. In reality, the water surface is not flat but has waves and ripples.
(a) Assuming the wave geometry can be closely approximated as two-dimensional and as shown in the schematic determine the effective emissivity of the water surface as defined in Problem 13.42, for ? = 3?/4.
(b) Calculate and plot the effective emissivity of the water surface normalized by the hemispherical emissivity of water (?en/?) over the range ?/2 5 ? ?.
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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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