Uniformity of gas-liquid two-phase flow in symmetrical parallelized branching microchannels

doi:10.11949/j.issn.0438-1157.20180576

Abstract

Abstract:

The uniformity of the gas-liquid two-phase flow and slug bubble in a symmetrical parallelized branching microchannel were studied by using a high-speed camera system. The glycerol-water solution containing 0.3% SDS and nitrogen were used as the liquid phase and the gas phase respectively. Two flow patterns of slug flow and bubble flow were observed, and a flow pattern and a flow pattern transition line composed of two-phase operation conditions were made. The results show that the non-uniformity of bubbles is caused by the hydrodynamics interaction between the two channels, the hydrodynamics feedback of the downstream channels, and the manufacturing differences of microchannels. With the increase of viscosity of the liquid phase, the uniformity of the bubbles becomes better. The bubble size distribution can be more uniform for high liquid flow rates and low gas pressures. The prediction models of bubble size in both microchannels were established based on the conservation principle of pressure drop and the gas-liquid two-phase flow resistance model.

Key words: microchannels, parallelization, multiphase flow, distributions, uniformity, feedback

摘要：

采用高速摄像系统研究了对称分支形并行微通道内气液两相流及弹状气泡均匀性规律。实验中分别采用含0.3% SDS的甘油-水溶液与氮气作为液相和气相。观察到弹状流和泡状流两种流型，作出了由两相操作条件构成的流型图及流型转变线。结果表明，气泡非均匀性主要由两微通道内流体之间的相互作用、下游通道中流体动力学的反馈作用以及通道制造误差造成。随液相黏度增大，气泡均匀性变好；在高液相流量以及低气相压力下操作，气泡尺寸分布更易达到均匀。基于压力降守恒原理和微通道内气液两相流阻力模型，构建了两通道中气泡尺寸的预测模型。

关键词: 微通道, 并行放大, 多相流, 分布, 均匀性, 反馈

CLC Number:

TQ021.4

SHEN Qiuying, TAHIR Muhammad Faran, CUMBULA Armando José, FU Taotao, JIANG Shaokun, ZHU Chunying, MA Youguang. Uniformity of gas-liquid two-phase flow in symmetrical parallelized branching microchannels[J]. CIESC Journal, 2018, 69(11): 4640-4647.

沈秋颖, Tahir Muhammad Faran, Cumbula Armando José, 付涛涛, 姜韶堃, 朱春英, 马友光. 对称分支并行微通道中气液两相流的均匀性规律[J]. 化工学报, 2018, 69(11): 4640-4647.

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