Two-phase flow characteristics across sudden contraction in small rectangular channels
- Mechanical Engineering Department, National Yunlin University of Science and Technology, Yunlin 640 (China)
- Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310 (China)
This study examines the two-phase flow pattern change and pressure drop at the sudden contraction from small rectangular channels (3 x 9 mm and 3 x 6 mm) into a 3 mm diameter tube. A unique deflection of contraction pressure drop vs. vapor quality is observed at a very low quality regime with an unusual ''liquid like vena contracta''. The measured pressure drops are compared with existing correlations/models, but none of them can accurately predict the available database. By proposing a correction factor accounting for the influence of surface tension (Bond number and contraction ratio) to the original homogeneous model, considerable improvement of the predictive ability of homogeneous model is arrived. The mean deviation of this correlation is 26.18% applicable to the present data (80 points) and available literatures (357 points). (author)
- OSTI ID:
- 21116051
- Journal Information:
- Experimental Thermal and Fluid Science, Vol. 32, Issue 8; Other Information: Elsevier Ltd. All rights reserved; ISSN 0894-1777
- Country of Publication:
- United States
- Language:
- English
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