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首页> 外文期刊>International Journal of Refrigeration >Effect of micro-grooves on the two-phase pressure drop of CO_2 in a mini-channel tube
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Effect of micro-grooves on the two-phase pressure drop of CO_2 in a mini-channel tube

机译：微沟槽对微通道管内CO_2两相压降的影响

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摘要

The pressure drop characteristics of CO_2 have been experimentally investigated for a mini-channel tube with and without micro rectangular grooves. The multiple mini-channels have an inner diameter of 0.8 mm and the grooves have a rectangular cross section (0.1 × 0.2 mm). The pressure drop was measured for a saturated liquid phase and two-phase. Using the hydraulic diameter, the pressure drop in the grooved mini-channel can be successfully estimated with the correlations used for smooth channels. Because of a smaller hydraulic diameter, the pressure drop of the grooved channel was found to be about 1.3 times and 1.1-1.45 times greater than that of the smooth channel, for liquid and two-phase, respectively. The experimental results were compared with widely used two-phase pressure drop models. Most of the models showed the mean absolute error of 17 -35% for the smooth channel and 13-32% for the grooved channel.
机译：对于具有和不具有微型矩形凹槽的微型通道管，已经通过实验研究了CO_2的压降特性。多个微型通道的内径为0.8毫米，凹槽的横截面为矩形（0.1×0.2毫米）。测量饱和液相和两相的压降。使用水力直径，可以使用光滑通道的相关性成功估算开槽的微型通道中的压降。由于较小的水力直径，发现有槽通道的压降分别是液体通道和两相通道的压降的1.3倍和光滑通道的压降的1.1-1.45倍。将实验结果与广泛使用的两相压降模型进行了比较。大多数模型显示，光滑通道的平均绝对误差为17 -35％，沟槽通道的平均绝对误差为13-32％。

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