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本文实验研究了平行多微通道入口处的特殊突缩结构所引起的单相气体流动压力损失。通过测定压缩空气流经通道入口前后的温度、压力和流量,得到了压力损失系数与单个微通道内流体Re数(3100～19000范围内)之间的关系式,与相关文献结果对比发现,现有的基于常规尺寸和微细尺寸的单通道突缩压降系数经验关联式不能正确预测平行多微通道入口突缩压力损失系数随Re数的变化。另外该关联式还能较好地预测饱和水蒸气的单相流动突缩压降系数。
In this paper, we study the single-phase gas flow pressure loss caused by the special shrinkage structure at the parallel multi-microchannel entrance. The relationship between the pressure loss coefficient and the Reynolds number of fluid in a single microchannel (within the range of 3100 ~ 19000) was obtained by measuring the temperature, pressure and flow rate before and after the compressed air flowed through the inlet. Compared with the related literatures, Some empiric correlations of single-channel sudden pressure drop coefficient based on conventional size and fine size can not correctly predict the change of Reynolds number coefficient of sudden pressure loss of parallel multi-microchannel inlet. In addition, the correlation can predict the single-phase flow sudden pressure drop coefficient of saturated water vapor better.