Free convection combined with radiation and wall conduction is analysed for a two-dimensional square cavity with differentially heated vertical walls. Radiation is solved by incorporating the weight-sum-of-gray-gases (WSGG) model into a modified form of the Spherical Harmonic (P_N) Differential Approximation Method-P1. The governing equations with Boussinesq approximation are written in primitive variables, and transposed from the physical to the mathematical space by the BFC (Boundary-Fitted Coordinate) technique. Predictions are obtained for Rayleigh numbers in the range of 10^3 to 10^6. Results are presented for pure free convection, free convection and wall conduction, and free convection and radiation. Comparison with data available in the literature indicate that the prediction tool has good accuracy and reliability.
Numerical Study of the Influence of Radiation and Wall Conduction Upon Two Dimensional, Laminar Free Convection
NOBILE, ENRICO
1992-01-01
Abstract
Free convection combined with radiation and wall conduction is analysed for a two-dimensional square cavity with differentially heated vertical walls. Radiation is solved by incorporating the weight-sum-of-gray-gases (WSGG) model into a modified form of the Spherical Harmonic (P_N) Differential Approximation Method-P1. The governing equations with Boussinesq approximation are written in primitive variables, and transposed from the physical to the mathematical space by the BFC (Boundary-Fitted Coordinate) technique. Predictions are obtained for Rayleigh numbers in the range of 10^3 to 10^6. Results are presented for pure free convection, free convection and wall conduction, and free convection and radiation. Comparison with data available in the literature indicate that the prediction tool has good accuracy and reliability.Pubblicazioni consigliate
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