Temperature-dependent viscosity effects in buoyancy-driven flow in a porous saturated enclosure is studied numerically, based on the general model of momentum transfer in a porous medium. The exponential form of the viscosity-temperature relation is applied. Both cases of viscosity increase and decrease versus temperature are considered. Application of the effective Rayleigh number concept and the reference temperature approach are investigated. Use of heat lines and energy flux vectors are illustrated for a more comprehensive analysis of the problem.
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Hooman et al. (2009) studied this question.
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