Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure

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	Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure
	Cai, Jun 1; Huai, Xiulan 1; Yan, Runsheng 2; Cheng, Yanjun 2
刊名	APPLIED THERMAL ENGINEERING
	2009-07-01
卷号	29 期号:10 页码:1973-1982
关键词	Convective heat transfer Acoustic cavitation Cavitation bubble Heat transfer enhancement Numerical simulation
英文摘要	Natural convection heat transfer of liquid in a square enclosure with and without acoustic cavitation is numerically investigated. In order to model the effect of sound field, a prescribed periodic change pressure is imposed on liquid in the region with ultrasonic beam. The cavitation model which takes into consideration such effects as phase change, bubble dynamics, and noncondensable gases is established. In order to capture the cavitation phenomenon and obtain a realistic pressure field and cavitation zones, the time step is set to quarter period of sound pressure and a relatively small relaxation factor for momentum equation and near zero relaxation factors for vaporization mass and density are used. The simulation results show that both liquid temperature uniformity and heat transfer coefficient of heating surface are greatly improved by means of acoustic cavitation. This phenomenon can be explained by jet-flow bundle formed by the asymmetry collapse of cavitation bubbles on the heating surface. The jet-flow bundle cannot only enhance fluid mixing around the heating surface and thus improve the uniformity of liquid temperature in the square enclosure, but also directly impact the heating surface and thus make thermal boundary layer become thin. The field synergy principle is introduced to analyze the heat transfer enhancement by acoustic cavitation. (C) 2008 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
研究领域[WOS]	Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
关键词[WOS]	FIELD SYNERGY PRINCIPLE ; ULTRASONIC VIBRATION ; FLUIDS
收录类别	SCI
语种	英语
WOS记录号	WOS:000265465100012
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/106436]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 2.Inst Light Ind Environm Protect, Beijing 100089, Peoples R China
推荐引用方式 GB/T 7714	Cai, Jun,Huai, Xiulan,Yan, Runsheng,et al. Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure[J]. APPLIED THERMAL ENGINEERING,2009,29(10):1973-1982.
APA	Cai, Jun,Huai, Xiulan,Yan, Runsheng,&Cheng, Yanjun.(2009).Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure.APPLIED THERMAL ENGINEERING,29(10),1973-1982.
MLA	Cai, Jun,et al."Numerical simulation on enhancement of natural convection heat transfer by acoustic cavitation in a square enclosure".APPLIED THERMAL ENGINEERING 29.10(2009):1973-1982.