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Journal of Enhanced Heat Transfer
Facteur d'impact: 1.406 Facteur d'impact sur 5 ans: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2015012617
pages 63-73

EXPERIMENTAL STUDY OF BUBBLE GROWTH AND FLOW IN SMALL-DIAMETER THERMOSYPHON LOOPS WITH FILLING RATIOS OF 90% AND 95%

Lingjiao Wei
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
Dazhong Yuan
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Ya Feng
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
Dawei Tang
Institute of Engineering Thermophysics, Chinese Academy of Sciences, 11 Beisihuanxi Road, Beijing 100190, China

RÉSUMÉ

In order to improve the understanding of the heat transfer mechanism in a two-phase closed thermosyphon loop with a liquid heat transfer agent (TPCTLL), a visualization experiment has been conducted to investigate the hydrodynamic flow in two loops with filling ratios of 90% and 95%, respectively. In this experiment, the bubble growth at the startup stage and the slug flow patterns at the steady stage have been observed by a digital high-speed camera. It is shown that the first generated bubble grew to the maximum size within 35 ms in tested loops; and the bubble rising velocity in the loop with the filling ratio of 90% was 0.35±0.05 m/s. In comparison with single-phase closed thermosyphon loops (SPCTLs), the liquid circulation in TPCTLLs is accelerated by vapor bubbles. Thus TPCTLLs can achieve a better thermal performance than SPCTLs.


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