The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown. Assume that a₁ = 0.8. αλ α 2 4 λ (μη) 9 G₂(W/m².μm) 5000 2 4 6 λ(um) What is the total, hemispherical absorptivity of the surface? α = i If it is assumed that ε = α and that the surface is at 900 K, what is its total, hemispherical emissivity? E = i What is the net radiant heat flux to the surface, in W/m²? gad net i W/m²
The spectral, hemispherical absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are as shown. Assume that a₁ = 0.8. αλ α 2 4 λ (μη) 9 G₂(W/m².μm) 5000 2 4 6 λ(um) What is the total, hemispherical absorptivity of the surface? α = i If it is assumed that ε = α and that the surface is at 900 K, what is its total, hemispherical emissivity? E = i What is the net radiant heat flux to the surface, in W/m²? gad net i W/m²
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
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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