Periodic flow boiling in a non-uniformly heated microchannel heat sink |
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| Affiliation: | 1. Offshore CCS Research Unit, Maritime and Ocean Engineering Research Institute, Korea Institute of Ocean Science and Technology, 32 1312 Beon-gil, Yuseong-daero, Yuseong-gu, Daejeon 305-343, Republic of Korea;2. Dept. of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Namgu, Pohang, Kyoungbuk 790-784, Republic of Korea;1. Department of Mechanical Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan;2. Department of Greenergy, National University of Tainan, Tainan 70005, Taiwan;3. Hydrogen Energy RD Center, Chung-Hsin Electric & Machinery Mfg. Corp. Ltd, Taiwan;1. Department of Energy Science and Engineering, Indian Institute of Technology-Bombay, Mumbai, 400076, India;2. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, 7491, Norway;1. Intel corporation, Haifa, Israel;2. Technion, Israel Institute of Technology, Israel;1. Ural Federal University, 4, Turgeneva str., 620000 Ekaterinburg, Russia;2. Institute of Continuous Media Mechanics, 1, Koroleva str., 614013 Perm, Russia |
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| Abstract: | Hydrodynamic and thermal characteristics of flow boiling in a non-uniformly heated microchannel were studied. Experiments were performed with a single microchannel and a series of microheaters to study the microscale boiling of water under axially non-uniform heat input conditions. A simultaneous real time visualization of the flow pattern was performed with the measurement of experimental parameters. Tests were performed over a mass flux of 309.8 kg/m2 s, and heat flux of 200–600 kW/m2. Test results showed different fluctuations of heated wall temperature, pressure drop, and mass flux with variations of the heat input along the flow direction. The unique periodic flow boiling in a single microchannel was observed at all heat flux conditions except for the increasing heat input distribution case which is the nearly uniform effective heat input distribution condition. The instability is correlated with flow pattern transition. For the nearly uniform effective heating condition, no fluctuation of the wall temperature, pressure drop, or mass flux was observed. We can relieve the instability by increasing total heat input along the flow direction and predict the instability using the transition criteria and flow pattern map. |
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| Keywords: | Flow boiling Microchannel Instability Two-phase flow pattern Heat sink |
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