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用数值模拟的方法研究了带内肋凹穴型微通道热沉内部流体层流流动与传热的情况,并根据热力学第二定律建立了变截面微通道的熵产模型.研究了Re数(198～600),相对凹穴高e1/Dh(0～0.65)及相对肋高e2/Dh(0～0.2167)参数对熵产和传热特性的影响.结果表明,相对肋高对熵产影响较大,而相对凹穴高对熵产的影响不大.内肋和凹穴的共同作用使微通道的传热效果明显优于光滑直通道,并且根据大量的模拟数据拟合了该通道Nu数和f数关于Re数、相对凹穴高e1/Dh及相对肋高e2/Dh的实验关联式.
The flow and heat transfer of the laminar flow in the cavity microchannel heat sink with internal rib were studied by numerical simulation and the entropy production model of the microchannel with variable cross section was established according to the second law of thermodynamics. 198 ~ 600), the relative cavity height e1 / Dh (0-0.65) and the relative rib height e2 / Dh (0-0.2167) on the entropy generation and heat transfer characteristics.The results show that the influence of relative rib height on entropy production While the relative pocket height has little effect on entropy production.The joint effect of the inner rib and the pocket makes the heat transfer of the microchannels better than that of the smooth straight channel and the channel Nu is fitted according to a large amount of simulation data The experimental correlation of number and f number with respect to Re number, relative cavity height e1 / Dh and relative rib height e2 / Dh.