12.35 A small metal object, initially at T; = 1000 K, is cooled by radiation in a low-temperature vacuum chamber. One of two thin coatings can be applied to the object so that spectral hemispherical emissivities vary with wavelength as shown. For which coating will the object most rapidly reach a temperature of T = 500 K?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.3P: Determine the total average hemispherical emissivity and the emissive power of a surface that has a...
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12.35 A small metal object, initially at T; = 1000 K, is
cooled by radiation in a low-temperature vacuum
chamber. One of two thin coatings can be applied to
the object so that spectral hemispherical emissivities
vary with wavelength as shown. For which coating
will the object most rapidly reach a temperature of
T, = 500 K?
1.0
Coating A
Coating B
టో 0.5
1
10
100
a (µm)
Transcribed Image Text:12.35 A small metal object, initially at T; = 1000 K, is cooled by radiation in a low-temperature vacuum chamber. One of two thin coatings can be applied to the object so that spectral hemispherical emissivities vary with wavelength as shown. For which coating will the object most rapidly reach a temperature of T, = 500 K? 1.0 Coating A Coating B టో 0.5 1 10 100 a (µm)
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