期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 104, 期 -, 页码 918-929出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2016.09.007
关键词
Vapor chamber; Heat transfer; Capillary; Permeability; Wick
资金
- National Natural Science Foundation of China [51275180]
- Science and Technology Planning Project for Industry University-Research Cooperation in Guangdong Province [2014B090901065]
- Natural Science Foundation of Guangdong Province [2014A030312017]
Micro-grooved wicks with reentrant cavity array (MGRAs) were fabricated with orthogonal Ploughing/Extrusion method for the application in the ultra-thin aluminum vapor chambers. Capillary rise tests using both ethanol and acetone as the working fluid were conducted by a novel IR-thermal imaging method. The experimental results indicated that the MGRAs yielded larger capillary height than the micro-grooved wicks (MGs) and the MGRA-1 exhibited the highest capillary rise rate of all samples studied. In addition, the permeability was characterized in the force flow tests. It was found that the MGRAs obtained comparable permeability to that for the MGs, revealing that they were able to enhance the capillary rise with little penalty of pressure drop. With regard to the capillary limited heat flux, the capillary parameter K.Delta P-cap was employed to evaluate the performance of the wicks comprehensively. The comparison of K.Delta P-cap between the prediction with/without the gravitational effect showed that the Washburn's Law greatly underestimated the K.Delta P-cap after the initial stage, so the gravitational effect should be taken into account when comparing the samples. In this case, K.Delta P-cap determined in the ethanol and acetone tests were similar. Besides, the MGRAs yielded higher K.Delta P-cap than that for the MGs, except for the MGRA-3/MG-3 couple, justifying the prominent performance of the MGRAs. Despite the fact that the MGRA-2 failed to obtain the largest capillary height, it showed the largest K.Delta P-cap among all MGRAs due to the good balance between the capillary pressure and permeability. Thus, it may be the optimum choice of all MGRAs in this study. (C) 2016 Elsevier Ltd. All rights reserved.
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