6.4 Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K. The plates are made from the same metal, and their spectral emissivities as a function of wavelength, &, are approximated as shown by two constant values joined by a linear decrease with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2. What is the energy flux if both plates are assumed gray with an approximate average emissiv- ity of 0.5 applied over the entire spectral range? 91 T₁ = 1400 K, EX T₂ = 700 K, Ex ↑92=-91 0.85 Ex 0.15 0 2 X (μm) 7

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Chapter11: Heat Transfer By Radiation
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Problem 11.11P
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6.4
Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K.
The plates are made from the same metal, and their spectral emissivities as a function of
wavelength, &, are approximated as shown by two constant values joined by a linear decrease
with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2.
What is the energy flux if both plates are assumed gray with an approximate average emissiv-
ity of 0.5 applied over the entire spectral range?
91
T₁ = 1400 K, Ex
T₂ = 700 K, EX
92-91
0.85
Ex
0.15
0
Answer: q₁106,850 W/m²; 91.gray = 68,070 W/m².
2
λ (μm)
7
Transcribed Image Text:6.4 Two large diffuse parallel plates are maintained at temperatures T₁ = 1400 K and T₂ = 700 K. The plates are made from the same metal, and their spectral emissivities as a function of wavelength, &, are approximated as shown by two constant values joined by a linear decrease with wavelength. Compute the net radiant energy flux being transferred from plate 1 to plate 2. What is the energy flux if both plates are assumed gray with an approximate average emissiv- ity of 0.5 applied over the entire spectral range? 91 T₁ = 1400 K, Ex T₂ = 700 K, EX 92-91 0.85 Ex 0.15 0 Answer: q₁106,850 W/m²; 91.gray = 68,070 W/m². 2 λ (μm) 7
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