Characteristics of Two-Phase Flows in a Rectangular Microchannel with a T-Junction Type Gas-Liquid Mixer
Characteristics of Two-Phase Flows in a Rectangular Microchannel with a T-Junction Type Gas-Liquid Mixer
复制标题
DOI：
10.1080/01457632.2010.509752
复制
发表时间：
2011-06
影响因子：
2.3
通讯作者：
A. Kawahara;M. Sadatomi;Keitaro Nei;Hideki Matsuo
中科院分区：
文献类型：
--
作者：
A. Kawahara;M. Sadatomi;Keitaro Nei;Hideki Matsuo
本文对水平矩形微通道内的气液两相流动进行了研究。矩形微通道水力直径为0.235 mm，宽和深分别为0.24 mm和0.23 mm。采用T形结型气液混合器，将气体和液体引入通道内。为了了解液体性质的影响，以蒸馏水、乙醇和HFE7200为试验液体，以氮气为试验气体。用高速摄像机测量了两相流中的流型、气泡长度、液塞长度和气泡速度，并根据气泡速度数据和表观气速数据确定了气泡的含气率。此外，还用校准后的差压传感器测量了压降。气泡长度数据与Garstecki等人提出的标度定律的计算结果进行了比较。[7]。气泡速度数据和/或空泡率数据与著名的漂移通量模型[12]进行了很好的关联，并建立了一个新的分布参数关联。摩擦压降数据与Lockhart-Martinelli方法以及两相摩擦倍数的关联也得到了很好的关联。
In this study, gas–liquid two-phase flows in a horizontal rectangular microchannel have been investigated. The rectangular microchannel has a hydraulic diameter of 0.235 mm, and a width and depth of 0.24 mm and 0.23 mm, respectively. A T-junction-type gas–liquid mixer was used to introduce gas and liquid in the channel. In order to know the effects of liquid properties, distilled water, ethanol, and HFE7200 were used as the test liquids, with nitrogen gas was used as the test gas. The flow pattern, the bubble length, the liquid slug length, and the bubble velocity in two-phase flow were measured with a high-speed video camera, and the void fraction was determined from the bubble velocity data and the superficial gas velocity data. In addition, the pressure drop was also measured with a calibrated differential pressure transducer. The bubble length data were compared with the calculation by the scaling law proposed by Garstecki et al. [7]. The bubble velocity data and/or the void fraction data were well correlated with the well-known drift flux model [12] with a new distribution parameter correlation developed in this study. The frictional pressure drop data were also well correlated with the Lockhart-Martinelli method with a correlation of the two-phase friction multiplier.