Experimental investigation on boiling heat transfer characteristics of Al2O3-water nanofluids in swirl microchannels subjected to an acceleration force

Sujun DONG; Hongsheng JIANG; Yongqi XIE; Xiaoming WANG; Zhongliang HU; Jun WANG

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Experimental investigation on boiling heat transfer characteristics of Al2O3-water nanofluids in swirl microchannels subjected to an acceleration force

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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 diam-eter 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 configu-ration C was found to be superior to that under configurations A and B. Moreover, the heat trans-fer coefficient increased with increases of the mass flow rate and the volume concentration and decreased with the aspect ratio.

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《中国航空学报（英文版）》 |2019年第5期|1136-1144|共9页
作者
Sujun DONG; Hongsheng JIANG; Yongqi XIE; Xiaoming WANG; Zhongliang HU; Jun WANG;
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作者单位

School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;

School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;

School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;

AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610041, China;

School of Chemical and Process Engineering, University of Leeds, Leeds LS29JT, United Kingdom;

School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;

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Experimental investigation on boiling heat transfer characteristics of Al2O3-water nanofluids in swirl microchannels subjected to an acceleration force

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