微通道内近临界流体瞬态混合与换热研究

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	微通道内近临界流体瞬态混合与换热研究; Transient mixing and heat transfer analysis of microchannel near-critical fluid flow
	陈林 ; 张信荣
刊名	工程热物理学报
	2015
关键词	近临界流体微通道对流换热混合数值模拟
英文摘要	近年来,微尺度条件下功能性流体换热与流动已经成为极具潜力和挑战性的课题,在化工、医药、传热与能源利用等系统中获得广泛应用。超临界CO_2流体作为一种天然替代性环保工质,在相关细微尺度下已证明具有良好的热力学性能。本研究采用了数值计算的方法对近临界CO_2流体在微通道内流动稳定性和换热特性进行了系列的探索。研究发现,在靠近临界点的相对较宽泛的区域内,流体具有强膨胀特性和低热扩散特性,从而在微尺度条件下产生局部旋涡流动,大大促进了微尺度的混合和对流换热效率。进一步,研究针对这种微尺度局部涡动进行了机理分析,获得了微通道内近临界流体瞬态换热和超临界热膨胀效应特性。; In recent years, micro-scale fluid flow and heat transfer have become one of the most promising and challenging topics in many engineering systems, such as chemical engineering, medical engineering, energy conversion systems, etc. Supercritical/near-critical CO2is a natural fluid, which has been widely used as a substitute fluid and has been proved to be advantageous in micro-scale with its preferable thermodynamic properties. The current study numerically studied the near-critical CO2horizontal flow and heat transfer performance in micro-scale channels. Due to the thermal-mechanical effects of critical fluid, abnormal thermal convection structure and transient micro-scale vortex mixing evolution mode are found in micro-scale channels. Along with the hot boundary vortex evolution, heat transfer of near-critical micro-scale channel flow is greatly enhanced, leading to fast thermal/heat transfer equilibrium process. The micro-vortex flow and self-expanding nature of the near-critical flow are also discussed into detail in this study. ? 2015, Science Press. All right reserved.; 国家自然科学基金资助项目; EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 3; 619-623; 36
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/436047]
专题	工学院
推荐引用方式 GB/T 7714	陈林,张信荣. 微通道内近临界流体瞬态混合与换热研究, Transient mixing and heat transfer analysis of microchannel near-critical fluid flow[J]. 工程热物理学报,2015.
APA	陈林,&张信荣.(2015).微通道内近临界流体瞬态混合与换热研究.工程热物理学报.
MLA	陈林,et al."微通道内近临界流体瞬态混合与换热研究".工程热物理学报 (2015).