Numerical analysis of flow characteristics and bubble behavior inside a two-phase closed thermosyphon under various temperature difference

In the present work, a two-dimensional axisymmetric two-phase closed thermosyphon model (TPCT) filled with refrigerant R-134a is developed based on the volume of fluid method, Lee model, and continuum surface force model in the Fluent to simulate the two-phase flow characteristics and bubble behavio...

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Bibliographic Details
Published in:Numerical heat transfer. Part A, Applications Applications, 2023-12, Vol.84 (12), p.1552-1569
Main Authors: Zai, Yunfeng, Qiao, Yiwei, Song, Chao, Tao, Hanzhong, Li, Yannan
Format: Article
Language:English
Subjects:
Bubble behavior
Evaporators
filling ratio
Flow characteristics
Inhomogeneity
Numerical analysis
temperature difference
Temperature gradients
Thermosyphons
TPCT
Two phase flow
VOF method
Wall temperature
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Summary:In the present work, a two-dimensional axisymmetric two-phase closed thermosyphon model (TPCT) filled with refrigerant R-134a is developed based on the volume of fluid method, Lee model, and continuum surface force model in the Fluent to simulate the two-phase flow characteristics and bubble behaviors inside the TPCT. The effects of increasing the temperature difference (ΔT) between the evaporator and condenser on the inner wall temperature, liquid film distribution and bubble growth process are highlighted. The results show that at different ΔT and FR, the inner wall temperature of the evaporator section increases and then decreases in inhomogeneity with increasing temperature difference at 0.5 and 0.75 FR, while at 0.05 and 0.25 FR, almost uniform inhomogeneity is observed. Bubble behavior is varied and affected by different ΔT at 0.75 FR, the comprehensive bubble incubation and growth is achieved by observing video.
ISSN:1040-7782
1521-0634
DOI:10.1080/10407782.2023.2178561