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Mixed Convection Heat Transfer for Nanofluids in a Lid-Driven Shallow Rectangular Cavity Uniformly Heated and Cooled from the Vertical Sides:The Opposing Case

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Journal of Electronics Cooling and Thermal Control 2013年第3期3卷 111-130页

作者： Hassan El Harfi mohamed Naimi mohamed lamsaadi Abdelghani Raji Mohammed Hasnaoui Physics Department Faculty of Sciences and TechnologiesSultan Moulay Slimane UniversityLaboratory of Flows and Transfers Modelling(LAMET)Beni-MellalMorocco Polydisciplinary Faculty Sultan Moulay Slimane UniversityInterdisciplinary Laboratory of Research in Sciences and Technologies(LIRST)Beni-MellalMorocco Physics Department Faculty of Sciences SemlaliaCadi Ayyad UniversityLaboratory of Fluid Mechanics and Energetics(LMFE)MarrakechMorocco

An investigation on flow and heat transfer due to mixed convection, in a lid-driven rectangular cavity filled with Cu- water nanofluids and submitted to uniform heat flux along with its vertical short sides, has been conducted numerically by solving the full governing equations with the finite volume method and the SIMPLER algorithm. In the case of a slender enclosure, these equations are considerably reduced by using the parallel flow concept. Solutions, for the flow and temperature fields, and the heat transfer rate, have been obtained depending on the governing parameters, which are the Reynolds, the Richardson numbers and the solid volume fraction of nanoparticles. A perfect agreement has been found between the results of the two approaches for a wide range of the abovementioned parameters. It has been shown that at low and high Richardson numbers, the convection is ensured by lid and buoyancy-driven effects, respectively, whereas between these extremes, both mechanisms compete. Moreover, the addition of Cu-nanoparticles, into the pure water, has been seen enhancing and degrading heat transfer by lid and buoyancy-driven effects, respectively.

关键词： Component Nanofluids Mixed Convection Heat Transfer Lid-Driven Cavity Parallel Flow Assumption Finite Volume Method

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