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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v18.i1.10
pages 1-10

A STUDY OF BUBBLE VENTING IN A MICROCHANNEL WITH HYDROPHOBIC NANOPOROUS MEMBRANES

Jin-Cherng Shyu
National Kaohsiung University of Applied Sciences
Kai-Shing Yang
Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Wei-Shen Chen
Department of Mechanical Engineering, National Yunlin University of Science & Technology, Yunlin 64002, Taiwan
Shih-Ying Chang
Department of Mechanical Engineering, National Yunlin University of Science & Technology, Yunlin 64002, Taiwan
Chi-Chuan Wang
Department of Mechanical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan

ABSTRACT

A 500-μm-wide and 11-mm-deep cross-microchannel, which is made of copper and attached by a hydrophobic nanoporous membrane having a pore size of 0.22 μm and a porosity of 70%, is tested in the present study to examine the characteristics of gas/liquid two-phase flow in the microchannel in horizontal and vertical orientations during bubble venting via the hydrophobic nanoporous membrane. The mass flux tested in the present study is 5, 7.5, 10, and 12.5 kg/m2·s. In addition, the quality in the present study is tested from 0 to 0.08. The effects of mass flux, quality, and microchannel orientation on both the gas/liquid two-phase flow pattern and the bubble venting efficiency are examined in the present experiment through direct flow visualization. The tested results show that the farthest bubble movement distance increases with quality. It is also found that the flow rate of residual gas with the vertical arrangement is larger than that of the horizontal orientation. This is because the buoyancy force is in favor of the horizontal configuration for providing more direct contact and such contact of the bubble and the membrane is helpful for bubble venting. Besides, it is found that the higher flow rate of residual gas leads to a higher-pressure drop gradient in the flow channel.


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