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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v13.i4.20
pages 323-342

TWO-PHASE FLOW ACROSS VERTICALLY SPLIT U-JUNCTIONS

Ing Youn Chen
Mechanical Engineering Department, National Yunlin University of Science and Technology, Yunlin, Taiwan 640
Chia Wei Tsai
National Yunlin University of Science and Technology, Yunlin, 640, Taiwan
Robert Hu
Industrial Technology Research Institute Hsinchu, 310, Taiwan
Chi-Chuan Wang
Department of Mechanical Engineering Chiao Tung University, Hsinchu 300, Chinese Taipei

RESUMO

A two-phase flow across a vertically split U-type junction inside two 6.7 mm smooth tubes having curvature ratios of 3 and 7 was visually observed. The range of mass flux is 100−700 kg/m2·s. The gas mass flux in the upper and lower tubes is generally increased with the rise of gas quality while the distribution of liquid mass flux reveals a minimum and a maximum phenomenon. The gas mass flux in the lower tube is continuously increased with gas quality and is generally lower than that in the upper tube. However, its value may exceed that of its counterpart at the upper tube when semi-annular or annular flow takes place (x > 0.1). The surprising results can be attributed to the negligible influence of buoyancy, the airflow dragged by the gravity-induced liquid flow in the lower tube, and the liquid obstacle in the upper leg hindering the airflow path.


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