摘要
为提高微通道散热器的传热性能,笔者采用在流道内壁涂覆石墨烯的方法对微通道的传热效率进行了优化。通过将分子动力学(Molecular Dynamics, MD)模拟与计算流体力学(Computational Fluid Dynamics, CFD)相结合,研究了入口流速、通道长度对石墨烯微通道和普通微通道的固液界面总传热率的影响。结果表明:石墨烯的引入使流体分子相对壁面产生了滑移,增大了流动的平均速度,降低了流体分子间的速度差异性;使用石墨烯涂层和增大入口流速均可大幅提高界面传热能力;相比于普通微通道,石墨烯微通道的传热率最高提升了49%,最高平均热流密度可达730 W/cm^(2);界面总传热率随通道长度的增大而提高,最终达到其最大值并趋于稳定。研究结果对于高性能微通道散热器的设计有一定的参考价值。
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/cm^(2).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.
作者
刘志凯
朱旻琦
万吴兵
魏宁
LIU Zhikai;ZHU Minqi;WAN Wubing;WEI Ning(School of Mechanical Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China;No.58 Research Institute,China Electronics Technology Group Corporation,Wuxi,Jiangsu 214072,China;National Supercomputing Center in Wuxi,Wuxi,Jiangsu 214000,China)
出处
《轻工机械》
CAS
2024年第4期36-42,49,共8页
Light Industry Machinery
基金
江苏省自然科学青年基金项目(BK2021007)。
关键词
微通道散热器
计算流体力学
分子动力学
石墨烯涂层
滑移速度
界面热阻
microchannel heat sink
CFD(Computational Fluid Dynamics)
MD(Molecular Dynamics)
graphene coating
slip velocity
interface thermal resistance
