Simulation of Nanofluid Flow and Heat Transfer in Contact Interface Microchannels
Based on numerical simulation method of computational fluid dynamics,laminar flow and heat transfer of Al2O3-water nanofluids in cutting contact microchannels were studied.The forced convection heat transfer characteristics of nanofluids under different volume fractions and Reynolds numbers were compared and analyzed.The results show that the addition of nanoparticles to the fluid has little effect on the flow rate of the cutting contact microchannel,but improves the thermal conductivity of the fluid,resulting in better convective heat transfer effect between the nanofluid and the wall surface,and the larger the volume fraction of nanoparticles,the more obvious the heat transfer effect.The heat transfer coefficient and Nussel number increase rapidly with Reynolds number when the Reynolds number is small(Re=0～100),and slowly increase with Reynolds number when the Reynolds number is large(Re=100～500).The heat transfer effect at high Reynolds number is obviously higher than that at low Reynolds number.Under the same nanoparticle concentration,the increase of convective heat transfer coefficient of fluid is larger than the increase of thermal conductivity of nanofluid.
MicrochannelNanofluidsNumerical SimulationHeat Transfer CoefficientNussel Number
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NSTL
万方数据
