Hydrodynamics and heat transfer prior to onset of nucleate boiling in a rectangular microchannel heat sink |
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| Affiliation: | 1. Department of Energy, Guangdong University of Technology, 510006 Guangzhou, China;2. Department of Energy, KTH Royal Institute of Technology,10044 Stockholm, Sweden;3. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong;1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. College of Electrical Engineering, Zhejiang University, Hangzhou, 310027, China;3. Department of Mechanical and Industrial Engineering (M/C 251), University of Illinois at Chicago, 842 West Taylor Street, Room 2049 ERF 60607-7022, Chicago, IL, United States |
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| Abstract: | The conjugate heat transfer of flow boiling in a rectangular microchannel heat sink (MCHS) was modelled numerically to investigate the hydrodynamics and thermal responses of flow prior to the onset of nucleate boiling (ONB). Local hydrodynamics and thermal conditions leading to ONB are analysed numerically for different heat flux. The flow patterns of different modes of microconvection and mixed convective flows including the circulating flow, wavy flow and seeping flow were demonstrated and discussed. The numerical study proposes the mechanism leading to the first bubble nucleation which cover the initiation of fluid instability until the ONB. This work provides better understanding of the superheat induced flow instability and the progressive fluid convection under transient heating. |
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