Abstract
A method to compute the thermal efficiency factor is proposed for a plane layer of nonisothermal and nondissipative medium with radiating and reflecting boundaries, and an analysis is given of its dependence on the optical thickness of the layer and the form of the temperature profile.
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Abbreviations
- ψ:
-
thermal efficiency factor (TEF) of the heating surface
- qinc, qr :
-
incident and return radiation fluxes, respectively
- Iout (0,μ) and Ir (0,μ):
-
intensity of radiation going out from and reflected back to the layer, respectively
- θ=arccosμ :
-
angle of observation
- τ :
-
optical thickness of the layer
- τ0 :
-
total optical thickness of the layer under investigation
- εw :
-
emissivity of the boundary surface
- r:
-
reflexivity of the boundary surface
- Tw :
-
temperature of the boundary surface
- B=B[T (τ)]=(2hν3/c2) (ehν/kT−1)−1 :
-
planck radiation
- λ:
-
radiation wavelength
- α=λT:
-
reduced temperature in according to [10]
- ef:
-
effective
- w:
-
boundary surface (wall)
- c:
-
center of the layer
Literature cited
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 39, No. 1, pp. 102–108, July, 1980.
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Trofimov, V.P., Adzerikho, K.S. Determination of the thermal efficiency factor of surfaces bounding a plane layer of a nonisothermal nondissipative medium. Journal of Engineering Physics 39, 786–791 (1980). https://doi.org/10.1007/BF00821836
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DOI: https://doi.org/10.1007/BF00821836