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首页> 外文期刊>Heat Transfer Engineering >Effect of Channel Length on the Gas-Liquid Two-Phase Flow Phenomena in a Microchannel
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Effect of Channel Length on the Gas-Liquid Two-Phase Flow Phenomena in a Microchannel

机译：通道长度对微通道内气液两相流现象的影响

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An optical measurement system was used to investigate the effect of microchannel length and inlet geometery on adiabatic gas-liquid two-phase flow. Experiments were conducted with 146-mm- and 1571 -mm-long, circular microchannels of 100 μm diameter. Void fraction and gas and liquid plug/slug lengths and their velocities were measured for two inlet configurations for gas-liquid mixing: (a) reducer and (b) T-junction. The superficial gas velocity was varied from 0.03 to 14 m/s, and superficial liquid velocity from 0.04 to 0.7 m/s. The test section length was found to have a significant effect on the two-phase flow characteristics measured at the same axial location (37 mm from the inlet) in both microchannels. The mean void fraction data for the short (146 mm) microchannel with the reducer inlet agreed well with the equation previously proposed by Kawahara et al. (2002). On the other hand, the mean void fraction data for the long (1571 mm) microchannel obeyed the homogeneous flow model and Armand's equation for both the reducer and T-junction inlet configurations. Many long and rapidly moving gas plugs/slugs and long, slowly moving liquid plugs/slugs were observed in the short microchannel compared to the long microchannel, leading to the differences in the time-averaged void fraction data. The mean velocity of liquid plugs/slugs generally agreed well with Hughmark's equation and the homogeneous flow model predictions, regardless of the inlet configurations and microchannel lengths. Thus, both the microchannel length and inlet geometry were found to significantly affect the two-phase flow characteristics in a microchannel.
机译：使用光学测量系统研究微通道长度和入口几何形状对绝热气液两相流的影响。实验使用直径为146 mm和1571 mm的圆形微通道，直径为100μm。测量了气-液混合的两种入口配置的空隙分数，气液塞/塞子的长度以及它们的速度：（a）减速器和（b）T型接头。表观气体速度在0.03至14 m / s之间变化，表层液体速度在0.04至0.7 m / s之间变化。发现在两个微通道的相同轴向位置（距入口37毫米）处测得的测试截面长度对两相流动特性有重大影响。带有减速器入口的短（146 mm）微通道的平均空隙率数据与Kawahara等人先前提出的方程式非常吻合。 （2002）。另一方面，长（1571 mm）微通道的平均空隙率数据遵循均质流动模型和异径流模型，以及异径管和T型接头入口配置的阿曼方程。与长微通道相比，在短微通道中观察到许多长而快速移动的气塞/塞和长而缓慢移动的液塞/塞，这导致了时间平均空隙率数据的差异。液体塞子/塞子的平均速度通常与休格马克方程式和均质流模型预测非常吻合，而与入口配置和微通道长度无关。因此，发现微通道长度和入口几何形状都显着影响微通道中的两相流动特性。

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