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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL SIMULATION OF FLOW BOILING IN TREE-SHAPED MICROCHANNEL

Wei Yu
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China

Chengbin Zhang
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China

Yongping Chen
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China; School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China

Abstract

The flow boiling in a tree-shaped microchannel network was numerically investigated based on the VOF (Volume-Of-Fluid) method, taking account for both mass and energy transfer. The vapor-liquid two-phase flow patterns evolution and the local pressure drop as well as heat transfer performance of each branching level channel were analyzed and discussed to reveal the influence of scale effect on the heat transfer performance in tree-shaped microchannel. The bubbly flow was observed in the low branching level, while the slug flow occurred in high branching level due to the bubble growth and coalescence, as well as the increasing channel confinement. The pressure drop decreases with the increasing branching level. The typical nucleate boiling dominates heat transfer in tree-shaped microchannel in which a large fraction of the channel is occupied by bubbly flow in low branching level channel. However, this nucleate boiling is gradually suppressed with the increasing branching level.

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