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NUMERICAL STUDY OF DOUBLE-DIFFUSIVE CONVECTION IN A HEATED LID-DRIVEN CAVITY WITH MASS DIFFUSIVE SIDE WALLS

卷 8, 册 4, 2016, pp. 381-398
DOI: 10.1615/ComputThermalScien.2016016887
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摘要

In this paper double-diffusive mixed convection in a heated lid driven cavity has been studied numerically using a finite element base code. Double-diffusive convection phenomenon is observed in many process industrial applications where essentially hot air is used to remove moisture or to aid any other process. In the current problem numerical investigations have been conducted on double-diffusive convection in a hot lid driven cavity with mass diffusive side walls. Galerkin's weighted residual method has been implemented to reduce the governing equations, namely vorticity transport, velocity, Poisson, energy, and solutal equations into weak form. Results have been obtained for different parameters like Reynolds number ranging from 100 to 500, Richardson number ranging from 0.1 to 3.0, and buoyancy ratio −50 to +50. Results show that an increase in Richardson number increased heat transfer rates when operated in a positive buoyancy ratio regime and the transverse is observed when operated in a negative regime. Increase in strength of buoyancy forces s to formation of a number of secondary circulations in the cavity, while an increase in inertial forces improved convective heat transfer rate from lid more effectively when buoyancy forces were weaker.

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