Microscale boiling heat transfer in a micro-timescale at high heat fluxes

doi:10.1088/0960-1317/15/2/017

GIEC OpenIR > 中国科学院广州能源研究所

	Microscale boiling heat transfer in a micro-timescale at high heat fluxes
	Xu, JL ; Gan, YH ; Zhang, DC ; Li, XH
	2005-02-01
发表期刊	JOURNAL OF MICROMECHANICS AND MICROENGINEERING
卷号	15 期号:2 页码:362-376
摘要	Microscale boiling heat transfer experiments were performed using acetone as the working fluid in ten parallel silicon microchannels with hydraulic diameters of 155.4 mum. An infrared radiator image system is used for the chip temperature measurements, while an optical system combining a microscope and a high-speed camera is used for transient flow pattern identification. By covering the present data range it is found that all microchannels repeat the transient flow patterns in a timescale of milliseconds while the fluid pressures/temperatures are stable. A full cycle can be subdivided into three substages: liquid refilling stage, bubble nucleation, growth and coalescence stage, and transient annular flow stage. Correspondingly four flow patterns are identified. Paired or triplet bubbles are observed to be nucleated and grow up simultaneously in, or very close to, the channel corners at the same cross section. The nucleated bubbles experience several milliseconds of growth until coalescence takes place. Then a single liquid plug is separated into two parts, which are pushed out of the flow field view in less than 1 ms. In the transient annular flow stage, the liquid films that are drawn into the comers of the channel become less and less versus time. Once a partially or fully dried-out state is reached, all the microchannels are refilled with fresh liquid and a new cycle begins. The probabilities of each flow pattern occurring and the liquid refilling follow the statistical principle well. The measured chip temperatures are not uniform across the whole heating area, attributed to the uneven liquid refilling probabilities for different channels and the uneven possibilities that are immersed in the liquid for different heating regions. The chip temperatures display spatial variation behavior in the majority of the heating area, due to the liquid and vapor alternatively passing through the microchannels. To the authors' knowledge, some of the above experimental findings have not been previously reported.
文章类型	Article
WOS标题词	Science & Technology ; Technology
DOI	10.1088/0960-1317/15/2/017
研究领域[WOS]	Engineering ; Science & Technology - Other Topics ; Instruments & Instrumentation ; Materials Science ; Mechanics
关键词[WOS]	2-PHASE FLOW PATTERNS ; PRESSURE-DROP ; AIR-WATER ; PART I ; MICROCHANNELS ; MINICHANNELS ; SINK
收录类别	SCI
语种	英语
WOS类目	Engineering, Electrical & Electronic ; Nanoscience & Nanotechnology ; Instruments & Instrumentation ; Materials Science, Multidisciplinary ; Mechanics
WOS记录号	WOS:000227483000018
引用统计	被引频次：52[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/10214
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Wushan 510640, Guangzhou, Peoples R China 2.Univ Sci & Technol, Dept Thermal & Energy Engn, Hefei 230027, Peoples R China 3.Peking Univ, Inst Microelect, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Xu, JL,Gan, YH,Zhang, DC,et al. Microscale boiling heat transfer in a micro-timescale at high heat fluxes[J]. JOURNAL OF MICROMECHANICS AND MICROENGINEERING,2005,15(2):362-376.
APA	Xu, JL,Gan, YH,Zhang, DC,&Li, XH.(2005).Microscale boiling heat transfer in a micro-timescale at high heat fluxes.JOURNAL OF MICROMECHANICS AND MICROENGINEERING,15(2),362-376.
MLA	Xu, JL,et al."Microscale boiling heat transfer in a micro-timescale at high heat fluxes".JOURNAL OF MICROMECHANICS AND MICROENGINEERING 15.2(2005):362-376.