期刊
CASE STUDIES IN THERMAL ENGINEERING
卷 35, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.csite.2022.102070
关键词
Two-phase loop thermosyphon; Phase-change flow; CFD simulation; Thermal stability; Porous media
资金
- National Natural Science Foundation of China [51806100]
- Natural Science Foundation of Jiangsu Province [BK20180706]
- startup foundation for introduced talents of Nanjing Tech University
- Cultivation Program for The Excellent Doctoral Dissertation of Nanjing Tech University [2020-16]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_1121]
This study investigates the phase-change flow inside a two-phase loop thermosyphon (TPLT) through a combined three-dimensional computational fluid dynamics (CFD) simulation and experimental investigation. The results show that the vertical evaporator heating mode at a filling ratio of 23.3% has the lowest thermal resistance, while the horizontal evaporator heating mode has better thermal performance. Additionally, the use of a porous media can increase flow stability in the horizontal evaporator.
Two-phase loop thermosyphon (TPLT) shows an oscillation phenomenon since the complex phase-change heat transfer and flow behaviors, decreases the system reliability in practice. A combined three-dimension CFD simulating/experimental investigation was carried out to investigate the phase-change flow inside TPLT. Results of the 3D-CFD model show good agreement with the experiments, with a maximum deviation of 2.86% and 3.98% for temperature distribution and pressure, respectively. In the vertical evaporator heating mode, the filling ratio of 23.3% produced the lowest total thermal resistance of 0.28-0.22K/VV since the dominant heat transfer mechanism of phase-change in the loop. With the increasing FR, from 48.0 to 84.1%, the dominant heat transfer mechanism might be transformed to single-phase convection. Thermal performance with the horizontal evaporator heating mode is better than that with the vertical evaporator heating mode since the good flowability at high FR = 84.1%. In the horizontal evaporator heating mode, a bidirectional flow was observed in the loop with the horizontal evaporator even at low FR = 23.3%, which caused pressure fluctuation and reduced thermal performance. But the flow stability could increase by 90% with the auxiliary of a porous media in the horizontal evaporator, indicating that the porous media had a positive effect on avoiding bidirectional flow.
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