An experimental investigation on the confined and elongated bubbles in subcooled flow boiling in a single microchannel |
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| Authors: | Liaofei Yin Li Jia Peng Guan Fuhao Liu |
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| Affiliation: | 1. Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China
2. Jiangsu Key Laboratory of Process Enhancement & New Energy Equipment Technology (Nanjing University of Technology), Nanjing, China
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| Abstract: | The characteristics of the confined bubble and elongated bubble in subcooled flow boiling in a single horizontal rectangular microchannel with hydraulic diameter Dh=1mm are studied experimentally. The channel with 1 × 1mm cross section is fabricated in a thin copper plate whose confinement number is Co=2.8 and the degassed deionized water is used as the working fluid. Visualization on the confined and elongated bubbles inside the microchannel is carried out by employing a high-speed CCD camera with a microlens. The recorded images are carefully analyzed to illustrate the behaviors of the confinement and elongation processes of the bubble. The boiling number is used as an adjustable parameter to regulate the operating conditions which is eventually found to take a vital role in the bubble elongation process. Two formation patterns of the confined and elongated bubble are identified and the interactions between the neighboring confined and elongated bubbles are elucidated. |
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| Keywords: | visualization flow boiling rectangular microchannel confined bubble elongated bubble |
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