Numerical study of the interactions and merge of multiple bubbles during convective boiling in micro channels |
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| Affiliation: | 1. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, China;2. Shaanxi Key Laboratory of Energy Chemical Process Intensification, Xi''an, China;3. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, China;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. School of Energy Science and Engineering, Central South University, Changsha 410083, China;2. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an 710049, China;3. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;1. National Institute of Technology Uttarakhand, Srinagar 246174, Uttarakhand, India;2. Indian Institute of Technology Patna, Bihta, 801103, Bihar, India |
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| Abstract: | Multi bubbles interaction and merger in a micro-channel flow boiling has been numerically studied. Effects of mass flux (56, 112, 200, and 335 kg/m2 1 s), wall heat flux (5, 10, and 15 kW/m2) and saturated temperature (300.15 and 303.15 K) are investigated. The coupled level set and volume of fluid (CLSVOF) method and non-equilibrium phase model are implemented to capture the two-phase interface, and the lateral merger process. It is found that the whole transition process can be divided to three sub-stages: sliding, merger, and post-merger. The evaporation rate is much higher in the first two stages due to the boundary layer effects in. Both the mass flux and heat flux affect bubble growth. Specifically, the bubble growth rate increase with the increase of heat flux, or the decrease of mass flux. |
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