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	Uniform mems chip temperatures in the nucleate boiling heat transfer region by selecting suitable, medium boiling number range
	Xu JL (Xu, J. L.); Gan YH (Gan, Y. H.)
	2008
发表期刊	NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
卷号	11期号:3/4页码:273-300
通讯作者	xujl@ms.giec.ac.cn
其他摘要	The not only lower but also uniform MEMS chip temperatures can he reached by selecting suitable boiling number range that ensures the nucleate boiling heat transfer. In this article, boiling heat transfer experiments in 10 silicon triangular microchannels with the hydraulic diameter of 55.4 mu m were performed using acetone as the working fluid, having the inlet liquid temperatures of 24-40 degrees C, mass fluxes of 96-360 kg/m(2)s, heat fluxes of 140-420 kW/m(2), and exit vapor mass qualities of 0.28-0.70. The above data range correspond to the boiling number from 1.574 x 10(-3) to 3.219 x 10(-3) and ensure the perfect nucleate boiling heat transfer region, providing a very uniform chip temperature distribution in both streamline and transverse directions. The boiling heat transfer coefficients determined by the infrared radiator image system were found to he dependent on the heat Axes only, not dependent on the mass Axes and the vapor mass qualities covering the above data range. The high-speed flow visualization shows that the periodic flow patterns take place inside the microchannel in the time scale of milliseconds, consisting of liquid refilling stage, bubble nucleation, growth and coalescence stage, and transient liquid film evaporation stage in a full cycle. The paired or triplet bubble nucleation sites can occur in the microchannel corners anywhere along the flow direction, accounting for the nucleate boiling heat transfer mode. The periodic boiling process is similar to a series of bubble nucleation, growth, and departure followed by the liquid refilling in a single cavity for the pool boiling situation. The chip temperature difference across the whole two-phase area is found to he small in a couple of degrees, providing a better thermal management scheme for the high heat flux electronic components. Chen's [11 widely accepted correlation for macrochannels and Bao et al.'s [21 correlation obtained in a copper capillary tube with the inside diameter of 1.95 mm using R11 and HCFC123 as working fluids can predict the present experimental data with accepted accuracy. Other correlations fail to predict the correct heat transfer coefficient trends. New heat transfer correlations are also recommended.
关键词	Microchannels Nucleate Boiling Heat Transfer Uniform Chip Temperature Flow Pattern Pressure-drop General Correlation Flow Channels Tubes Refrigerants Devices Annuli Sink Flux
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/3394
专题	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Xu JL ,Gan YH . Uniform mems chip temperatures in the nucleate boiling heat transfer region by selecting suitable, medium boiling number range[J]. NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING,2008,11(3/4):273-300.
APA	Xu JL ,&Gan YH .(2008).Uniform mems chip temperatures in the nucleate boiling heat transfer region by selecting suitable, medium boiling number range.NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING,11(3/4),273-300.
MLA	Xu JL ,et al."Uniform mems chip temperatures in the nucleate boiling heat transfer region by selecting suitable, medium boiling number range".NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING 11.3/4(2008):273-300.

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