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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

NATURAL CONVECTION IN POROUS MEDIA AND GEOTHERMAL SYSTEMS

Get access (open in a dialog) DOI: 10.1615/IHTC6.2370
pages 45-59

Résumé

The first part of the paper is devoted to the state of the art on thermal convection in porous media. Attention is mainly focused on experimental and theoretical results concerning natural and mixed convection in homogeneous and isotropic porous layers saturated with a fluid obeying the Boussinesq assumption. A special description is given of a sophisticated model used in the analysis of the physical observations on the heat transfer. Also, new results are presented for the case where the porous medium is not isotropic. Furthermore some cases of fluids which do not obey the Boussinesq assumption are also noted.
In the second part, the classical role of convection in geothermal fields is presented for the case of the usual steam field, describing the over-all heat fluxes, temperature distribution and energy balance. In a more general way, complementary information is given on the influence of free convection in aquifers in natural or artificial situations. In addition, scaling problems are discussed from the pore level to the overall geothermal field. Some guidelines are derived which can be useful for the mathematical modeling of real heterogeneous systems.