The numerical simulation of flow and heat transfer characteristics of hybrid nanofluids in a manifold microchannel heat sink(MMHS)was performed.Using Al2O3-CuO-water as the working fluid,the effects of the mixing ratio of nanoparticles,volume fraction(φ),Reynolds number(Re),and the introduction of grooves on the flow and heat transfer of the heat sink were investigated.The results showed that the hybrid nanofluids have excellent thermodynamic properties at high concentrations and Re,but the corresponding pressure drop increases.The overall performance of the hybrid nanofluids with a mixing ratio of 1∶4 is the best.When Re=100,φ=6%,the pump power consumption is 18.9%lower,and the overall performance index is 21.7%higher than that of single Al2O3-water nanofluids.Adding different shapes of grooves on the sidewall has a similar heat transfer effect to that of a smooth bifurcation microchannel.
manifold microchannel heat sinkhybrid nanofluidgrooved structureflow and heat transfer
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