Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel
Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel
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DOI：
10.1016/s0301-9322(02)00037-x
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发表时间：
2002-09-01
影响因子：
3.8
通讯作者：
Kawaji, M
中科院分区：
文献类型：
--
作者：
Kawahara, A;Chung, PMY;Kawaji, M
对直径为100 μ m的圆管内两相流动特性进行了实验研究。在石英玻璃毛细管中，以气相表观速度j（G）= 0.1 ~ 60 m/s，液相表观速度j（L）= 0.02 ~ 4 m/s注入去离子水和氮气，通过视频记录确定了两相流流型。同时还得到了气液两相流时均含气率和两相摩擦压降的数据并进行了分析。观察到的流动模式是间歇性的和半环形的流动，但更仔细的研究的液体膜结构揭示了气体核心流与一个光滑的或环形的膜和蛇形的气体核心周围的变形液膜。未观察到气泡和搅动流型。根据每种流动类型出现的概率绘制了流型图，并与现有的直径为1 mm的通道的流型图进行了比较。即使在高气体流速下，空隙率仍然很低，表明相之间的滑移比大且动量耦合弱。单相摩擦系数和两相摩擦系数的计算结果与传统的关联式吻合较好。(C)2002爱思唯尔科技有限公司版权所有。
An experimental investigation has been carried out on two-phase flow characteristics in a 100 mum diameter circular tube. Two-phase flow patterns were determined by video recording the flow in the transparent capillary tube made of fused silica, in which de-ionized water and nitrogen gas were injected at superficial velocities of j(G) = 0.1-60 m/s for gas, and j(L) = 0.02-4 m/s for liquid. Time-averaged void fraction and two-phase friction pressure drop data were also obtained and anal; zed. The flow patterns observed were intermittent and semi-annular flows, but a closer study of the liquid film structure revealed gas core flows with a smooth or ring-shaped film and a serpentine-like gas core surrounded by a deformed liquid film. Bubbly and churn flow patterns were not observed. A flow pattern map was developed based on the probability of appearance of each type of flow, and compared to the existing flow pattern maps obtained for similar to1-mm diameter channels. Void fraction remained low even at high gas flow rates, indicating large slip ratios and weak momentum coupling between the phases. The single-phase friction factor and two-phase friction multiplier data were shown to be in good agreement with the conventional correlations. (C) 2002 Elsevier Science Ltd. All rights reserved.