Boiling heat transfer in rectangular microchannels with reentrant cavities |
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| Affiliation: | 1. Mechanical, Aeronautical, and Nuclear Engineering Department, Rensselaer Polytechnic Institute, 110 8th St., Troy, NY, USA;2. Department of Mechanical and Aerospace Engineering, University of Central Florida, 12760 Pegasus Blvd, Orlando, FL, USA;1. Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institute, South China University of Technology, Guangzhou 510640, China;2. Mechanical Engineering, Pennsylvania State University, Harrisburg, PA 17057, United States |
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| Abstract: | This paper investigates flow boiling of water in microchannels with a hydraulic diameter of 227 μm possessing 7.5 μm wide reentrant cavities on the sidewalls. Average two-phase heat transfer coefficients and CHF conditions have been obtained over a range of effective heat fluxes (28–445 W/cm2) and mass velocities (41–302 kg/m2 s). High Boiling number and Reynolds number have been found to promote convective boiling, while Nucleate Boiling dominated at low Reynolds number and Boiling number. A criterion for the transition between nucleate and convective boiling has been provided. Existing correlations did not provide satisfactory agreement with the heat transfer coefficient but did predict CHF conditions well. |
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