Subcooled flow boiling and microbubble emission boiling phenomena in a partially heated microchannel |
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| Authors: | Guodong Wang Ping Cheng |
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| Affiliation: | 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;1. Department of Mechanical Engineering, University of Maryland, College Park, MD, USA;2. Department of Mechanical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa, Israel;1. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;2. Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei 10608, Taiwan;3. National Synchrontron Radiation Research Center, Hsin-Chu, Taiwan;4. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;5. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;1. Department of Chemistry, Aristotle University of Thessaloniki, University Box 116, 54124 Thessaloniki, Greece;2. Mechanical Engineering Department, Technical University of Serres, 62124 Serres, Greece;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China;2. College of Mechanical Engineering, Guangxi University, Nanning 530004, Guangxi, China |
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| Abstract: | A simultaneous visualization and measurement study has been carried out to investigate subcooled flow boiling and microbubble emission boiling (MEB) phenomena of deionized water in a partially heated Pyrex glass microchannel, having a hydraulic diameter of 155 μm, which was integrated with a Platinum microheater. Effects of mass flux, inlet water subcooling and surface condition of the microheater on subcooled flow boiling in microchannels are investigated. It is found that MEB occurred at high inlet subcoolings and at high heat fluxes, where vapor bubbles collapsed into microbubbles after contacting with the surrounding highly subcooled liquid. In the fully-developed MEB regime where the entire microheater was covered by MEB, the mass flux, the inlet water subcooling and the heater surface condition have only small effects on the boiling curves. The occurrence of MEB in microchannel can remove a large amount of heat flux, as high as 14.41 MW/m2 at a mass flux of 883.8 kg/m2 s, with only a moderate rise in wall temperature. Therefore, MEB is a very promising method for cooling of microelectronic chips. Heat transfer in the fully-developed MEB in the microchannel is presented, which is compared with existing subcooled flow boiling heat transfer correlations for macrochannels. |
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