The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown. Assume that a₁ = 0.6. %20 α₁ 0 2 4 6 λ (um) What is the total, hemispherical absorptivity of the surface? α = i G₂ (W/m² μm) What is the net radiant heat flux to the surface, in W/m²? grad.net = i W/m² 5000 4 λ (μm) 2 If it is assumed that ε = a and that the surface is at 1100 K, what is its total, hemispherical emissivity? € = 6
The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown. Assume that a₁ = 0.6. %20 α₁ 0 2 4 6 λ (um) What is the total, hemispherical absorptivity of the surface? α = i G₂ (W/m² μm) What is the net radiant heat flux to the surface, in W/m²? grad.net = i W/m² 5000 4 λ (μm) 2 If it is assumed that ε = a and that the surface is at 1100 K, what is its total, hemispherical emissivity? € = 6
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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The last portion asks you for "net radiant heat flux to the surface", meaning that positive net radiative heat flux means in and negative net radiative heat flux means out. This is opposite the typical sign convention - be aware of this
Transcribed Image Text:The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as
shown.
Assume that a₁ = 0.6.
20
a
0
2
4 6
λ (μm)
What is the total, hemispherical absorptivity of the surface?
α = i
G₂ (W/m².um)
What is the net radiant heat flux to the surface, in W/m²?
grad.net = i
W/m²
5000
4
λ (μm)
2
If it is assumed that and that the surface is at 1100 K, what is its total, hemispherical emissivity?
ε =
6
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