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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Imprimir: 1940-2503
ISSN En Línea: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2020021272
pages 41-54

NUMERICAL STUDY OF BUBBLE GROWTH AND HEAT TRANSFER IN MICROCHANNEL USING DYNAMIC CONTACT ANGLE MODELS

Ayyaz Siddique
Department of Mechanical Engineering, Indian Institute of Technology, Bombay Mumbai - 400076, India
Atul Sharma
Department of Mechanical Engineering, Indian Institute of Technology, Bombay Mumbai, India
Amit Agrawal
Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Mumbai, 400076, India
Sandip Kumar Saha
Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai – 400 076. Maharashtra, India

SINOPSIS

Numerical study is performed to investigate the bubble dynamics and heat transfer characteristics during flow boiling in a microchannel considering dynamic contact angle models reported in the literature. A two-dimensional domain is chosen where continuity, momentum, and energy equations are solved in two phases using the finite volume method-based semi-explicit pressure projection method. The unsteady bubble interface and bubble growth are identified by the dual-grid level-set method-based numerical model. The results suggest that the Kalliadasis and Chang model predicts the bubble growth closest to the experimental value and is more accurate compared to the static contact angle model. Furthermore, the effects of wall superheat and system pressure on bubble dynamics and heat transfer are studied. It is found that the system pressure and wall superheat have significant effects on the bubble growth characteristics. The transient Nusselt number shows a decreasing trend with the dynamic contact angle model similar to the static contact angle model.

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