Numerical Simulation of Flow and Heat Transfer in Graphene Microchannel
In order to improve the heat transfer performance of microchannel heat sinks,the graphene coating was applied to the inner wall of the channels to optimize heat transfer efficiency.By combining molecular dynamics simulations with computational fluid dynamics,the impact of inlet velocity and channel length on total heat transfer rate at the solid-liquid interface of graphene-coated microchannels and conventional microchannels was investigated.The results show that the introduction of graphene leads to slippage of fluid molecules relative to the wall surface,increases the average flow velocity,and reduces the velocity difference between the fluid molecules.The use of graphene coatings and increased the inlet velocity can significantly improve interfacial heat transfer capacity.Compared with conventional microchannels,the heat transfer rate of graphene microchannels is increased by up to 49%,and the maximum average heat flux can reach 730 W/cm2.The interfacial heat transfer rate increases with the channel length,eventually reaches its maximum value and tends to stablility.The reseach results have some reference value for the design of high-performance microchannel heat sink.
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