A four-zone model for saturated flow boiling in a microchannel of rectangular cross-section |
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| Authors: | Guodong Wang Liang Hao Ping Cheng |
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| Affiliation: | 1. Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Department of Mechanical Engineering, University of Huston, Huston, TX 77204-4792, USA;1. King Mongkut’s Institute of Technology Ladkrabang, Chumphon Campus, Chumphon 86160, Thailand;2. Department of Physics, Faculty of Science, Thaksin University, Phattalung 93110, Thailand;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;4. The Academy of Science, The Royal Institute of Thailand, Sanam Suea Pa, Dusit, Bangkok 10300, Thailand;1. School of Engineering, The University of Edinburgh, Kings Buildings, Mayfield Road, Edinburgh EH9 3JL, UK;2. Institute of Biomaterials and Biomedical Engineering, University of Toronto, 160 College Street, Toronto ON M5S 3E1,Canada |
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| Abstract: | A four-zone flow boiling model is presented to describe saturated flow boiling heat transfer mechanisms in a microchannel of rectangular cross-section. The boiling process in the microchannel is assumed to be a cyclic passage of four zones: (i) liquid-slug zone, (ii) elongated bubble zone, (iii) partially-dryout zone, and (iv) fully-dryout zone. The existence of the partially-dryout zone in this model is proposed to take into consideration of corner effects on boiling heat transfer in the microchannel. To verify this new model, an experimental study was carried out to investigate flow boiling heat transfer of water in a microchannel having a rectangular cross-section with a hydraulic diameter of 137 μm (202 μm in width and 104 μm in depth) with a length of 30 mm under three-side heating condition. The data for bubble nucleation frequency was correlated in terms of the Boiling number, which was used to determine the heat transfer coefficient. It is found that the present four-zone flow boiling model successfully predicts trends of boiling heat transfer data in a microchannel with a rectangular cross-section, having a sharp peak at low vapor quality depending on the mass flow rate. The predictions of flow boiling heat transfer coefficient in the microchannel are found in good agreement with experimental data with a MAE of 13.9%. |
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