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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Saturated critical heat flux in a multi-microchannel heat sink fed by a split flow system
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Saturated critical heat flux in a multi-microchannel heat sink fed by a split flow system

机译：分流系统供入的多微通道散热器中的饱和临界热通量

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摘要

An extensive experimental campaign has been carried out for the measurement of saturated critical heat flux in a multi-microchannel copper heat sink. The heat sink was formed by 29 parallel channels that were 199 lm wide and 756 lm deep. In order to increase the critical heat flux and reduce the two-phase pressure drop, a split flow system was implemented with one central inlet at the middle of the channels and two outlets at either end. The base critical heat flux was measured using three HFC Refrigerants (R134a, R236fa and R245fa) for mass fluxes ranging from 250 to 1500 kg/m2 s, inlet subcoolings from 25 to 5 K and saturation temperatures from 20 to 50 C. The parametric effects of mass velocity, saturation temperature and inlet subcooling were investigated. The analysis showed that significantly higher CHF was obtainable with the split flow system (one inlet–two outlets) compared to the single inlet–single outlet system, providing also a much lower pressure drop. Notably several existing predictive methods matched the experimental data quite well and quantitatively predicted the benefit of higher CHF of the split flow.
机译：为了测量多微通道铜散热器中的饱和临界热通量，进行了广泛的实验。散热器由29个平行的通道形成，它们的宽度分别为199 lm和756 lm。为了增加临界热通量并减小两相压降，实施了分流系统，在通道中间有一个中央入口，在两端有两个出口。使用三种HFC制冷剂（R134a，R236fa和R245fa）测量基本临界热通量，质量通量范围为250至1500 kg / m2 s，进口过冷度为25至5 K，饱和温度为20至50C。参数效应研究了质量速度，饱和温度和入口过冷情况。分析表明，与单进单出系统相比，分流系统（一进二出）可获得更高的CHF值，压力降也低得多。值得注意的是，几种现有的预测方法与实验数据非常吻合，并定量预测了分流较高CHF的好处。

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