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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

A NUMERICAL STUDY OF RAYLEIGH-BENARD CONVECTION IN RADIATING GASES

Get access (open in a dialog) DOI: 10.1615/IHTC11.4220
pages 261-266

要約

A numerical study of coupled gas radiation and natural convection in a two-dimensional horizontal cavity heated from below is reported. The momentum and energy balance equations are solved using finite differences. Molecular radiative properties are modeled using an Absorption Distribution Function model and the radiative transfer equation is solved using a ray-tracing method suitable for the considered two-dimensional flow geometry. The delay of the onset of Rayleigh-Benard convection due to gas radiation is quantitatively confirmed by the numerical simulations. Beyond the onset of convection, it is shown that gas radiation can modify the number of convective cells in the cavity. It generally increases the conductive flux at the walls, except for high emissivity walls, but generally decreases the total flux, except for perfectly reflecting walls.