An experimental study of inclination on the boiling heat transfer characteristics of a micro-channel heat sink using HFE-7100

被引:29
作者
Hsu, Li-Chieh [1 ]
Cion, Sian-Wun [1 ]
Lin, Kuo-Wei [2 ]
Wang, Chi-Chuan [2 ]
机构
[1] Natl Yunlin Univ Sci & Technol, Dept Mech Engn, Yunlin 640, Taiwan
[2] Natl Chiao Tung Univ, Dept Mech Engn, Hsinchu 300, Taiwan
关键词
Dielectric fluid; Inclination; Micro-channel; Convective boiling; MINI/MICRO-CHANNEL FLOWS; GENERAL CORRELATION; PRESSURE-DROP; PREDICTIVE METHODS; DATABASES; TUBES; FLUX;
D O I
10.1016/j.icheatmasstransfer.2015.01.007
中图分类号
O414.1 [热力学];
学科分类号
摘要
In this study, the effect of inclination on the two-phase convective boiling heat transfer characteristics of HFE-7100 is investigated experimentally in a multiport micro-channel having a hydraulic diameter of 440 mu m. The corresponding mass flux is 100 and 200 kg m(-2) S-1, respectively. The inclinations include -90, -45, 0, 45, and 90 degrees with respect to the horizon. Test results show that normally the heat transfer coefficient for upward arrangements is superior to those of downward arrangement at a supplied heat flux of 25 kW m(-2). Yet this is applicable for G = 100 or 200 kg m(-2) s(-1). The heat transfer coefficients increase with the vapor quality and peak again at a vapor quality of 0.6, suggesting a controlled mechanism of convective boiling. With the rise of heat flux to 40 kW m(-2), it appears that nucleate boiling may impose appreciable effect on the heat transfer mechanism. For G = 100 kg m(-2) s(-1), the heat transfer coefficients for all arrangements are insensitive to change of vapor quality (x < 0.6), implicating that nucleate boiling is in control. Analogous results prevail for G = 200 kg m(-2) s (-1). Six heat transfer correlations are used to predict experimental data in different orientation. It appears that the Kandlikar correlation shows the best-predictive ability against the present data with an overall mean deviation of 29.04% (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:13 / 17
页数:5
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