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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

LAMINAR NATURAL CONVECTION IN AN ENCLOSURE FORMED BY NON-ISOTHERMAL WALLS

Get access (open in a dialog) DOI: 10.1615/IHTC11.3470
pages 459-464

Resumo

The problem of natural convection in a gas filled tall rectangular enclosure formed by a non-isothermal vertical wall, hot bottom wall and cold side and top walls has been analysed by the control volume based numerical method. The enclosure geometry and thermal boundary conditions closely simulate those encountered in a Liquid Metal cooled Fast Breeder Reactor. The aspect ratio of the enclosure was varied from 1 to 10 and the Rayleigh number based on height was varied from 0 to 106. It was found that at low Rayleigh numbers the flow pattern has single primary cell. However as Rayleigh number increases multiple secondary cells are formed on the top of the primary cell. The heat flux distribution on the walls and the heat load to the cold walls have been predicted. Mild natural convection is found to reduce the heat load to the cold walls and for any value of aspect ratio, there is a critical Rayleigh number for which the heat load is minimum. Also for any value of Rayleigh number, it is found that there exists a critical aspect ratio for which the heat load is minimum.