期刊
CHINESE JOURNAL OF AERONAUTICS
卷 32, 期 5, 页码 1136-1144出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cja.2019.01.016
关键词
Acceleration; Boiling heat transfer; Microchannel; Nanofluid; Swirl microchannels
资金
- Youth Talent Plan of Beijing of China
- YETP [1087]
Experiments were carried out to investigate the boiling heat transfer characteristics of Al2O3-water nanofluids in swirl microchannels under terrestrial gravity and acceleration fields. A centrifuge with a two-meter long rotational arm was used to simulate the acceleration magnitude up to 9g and three various acceleration directions. Three test sections with different geometric parameters were applied. The volume concentration of Al2O3 nanoparticles with an average diameter of 13 nm was varied from 0.07% to 0.1%. The mass flow rate and vapor quality were in ranges of 3-6 kg/h and 0.4-1.0%, respectively. The effects of the mass flow rate, microchannel aspect ratio, vapor quality, nanoparticle volume concentration, and acceleration direction and magnitude were analyzed in a systematic manner. Experimental results showed that the acceleration direction and magnitude had significant influences on the boiling heat transfer. The heat transfer under configuration C was found to be superior to that under configurations A and B. Moreover, the heat transfer coefficient increased with increases of the mass flow rate and the volume concentration and decreased with the aspect ratio. (C) 2019 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd.
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