Numerical investigation of near-critical fluid convective flow mixing in   microchannels

doi:10.1016/j.ces.2013.04.010

CORC > 北京大学 > 工学院

	Numerical investigation of near-critical fluid convective flow mixing in microchannels
	Chen, Lin ; Zhang, Xin-Rong ; Okajima, Junnosuke ; Maruyama, Shigenao
刊名	chemical engineering science
	2013
关键词	Near-critical fluid Thermodynamics process Microchannel Numerical analysis Fluid mechanics Mixing HEAT-TRANSFER SUPERCRITICAL CO2 CIRCULATION LOOP CHANNELS
DOI	10.1016/j.ces.2013.04.010
英文摘要	Supercritical CO2 fluid has been widely used in chemical extraction, chemical synthesis, micro-manufacturing and heat transfer apparatus, and so forth. The current study deals with near-critical CO2 microchannel mixing flow and its basic characteristics. Careful numerical investigations are carried out by solving the coupled computational fluid dynamic equations. The results show that strong near-critical vortex flows can be achieved in a relatively wide range of initial and controlling conditions in microchannels. Basic, isothermally developed flows are simulated and then used as the initial state for a heat convective simulation. After the wall heat flux is applied, the vortex mixing flow originates from the hot boundaries in microchannels with height D=100 mu m to 200 mu m, while natural convection will gradually become dominant for microchannels with D=300 mu m to 500 mu m. The current micro-mixing evolution can be ascribed to a novel type of Kelvin-Helmholtz instability. Well-correlated characteristic numbers are identified for the effective near-critical microchannel mixing cases. The vortex growth and evolution mode in microchannels are found to differ greatly from previous micro-mixing methods. Possible applications in micro-engineering/chemical process are also discussed in this study. (c) 2013 Elsevier Ltd. All rights reserved.; Engineering, Chemical; SCI(E); EI; 8; ARTICLE; 67-80; 97
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/154480]
专题	工学院
推荐引用方式 GB/T 7714	Chen, Lin,Zhang, Xin-Rong,Okajima, Junnosuke,et al. Numerical investigation of near-critical fluid convective flow mixing in microchannels[J]. chemical engineering science,2013.
APA	Chen, Lin,Zhang, Xin-Rong,Okajima, Junnosuke,&Maruyama, Shigenao.(2013).Numerical investigation of near-critical fluid convective flow mixing in microchannels.chemical engineering science.
MLA	Chen, Lin,et al."Numerical investigation of near-critical fluid convective flow mixing in microchannels".chemical engineering science (2013).