Pressure effects on flow boiling instabilities in parallel microchannels |
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| Authors: | C.-J. Kuo Y. Peles |
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| Affiliation: | 1. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, Hunan 410073, People’s Republic of China;2. School of Engineering, University of Edinburgh, The King’s Buildings, Mayfield Road, Edinburgh EH9 3JL, UK;3. UVHC, TEMPO, Universite Valenciennes, F-59313, France;1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Heilongjiang 150001, PR China;2. Wuhan Second Ship Design and Research Institute, Wuhan 430205, PR China;3. China Ship Development and Design Center, Wuhan 430064, PR China;1. Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China |
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| Abstract: | The effects of pressure on flow boiling instabilities in microchannels were experimentally studied. Experiments were conducted using water in 223 μm hydraulic diameter microchannels with mass fluxes ranging from 86 to 520 kg/m2 s and pressures ranging from 50 to 205 kPa. Onset of flow oscillation, critical heat flux (CHF) conditions, local transient temperature measurements along with flow boiling visualization were obtained and studied. System pressure was found to significantly affect flow instabilities. For high pressure, it was observed that boiling instabilities were significantly delayed and CHF was extended to high mass qualities. Local temperature measurements also revealed lower magnitudes and higher frequencies of oscillations at high system pressures. |
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