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	Boundary conditions at the solid-liquid surface over the multiscale channel size from nanometer to micron
	Xu, Jinliang; Li, Yuxiu
刊名	International journal of heat and mass transfer
	2007-07-01
卷号	50期号:13-14页码:2571-2581
关键词	Boundary condition Slip length Interfacial parameter Channel size
ISSN号	0017-9310
DOI	10.1016/j.ijheatmasstransfer.2006.11.031
通讯作者	Xu, jinliang(xujl@ms.giec.ac.cn)
英文摘要	The boundary condition at the solid surface is one of the important problems for the microfluidics. in this paper we study the effects of the channel sizes on the boundary conditions (bc), using the hybrid computation scheme adjoining the molecular dynamics (md) simulations and the continuum fluid mechanics. we could reproduce the three types of boundary conditions (slip, no-slip and locking) over the multiscale channel sizes. the slip lengths are found to be mainly dependent on the interfacial parameters with the fixed apparent shear rate. the channel size has little effects on the slip lengths if the size is above a critical value within a couple of tens of molecular diameters. we explore the liquid particle distributions nearest the solid walls and found that the slip boundary condition always corresponds to the uniform liquid particle distributions parallel to the solid walls, while the no-slip or locking boundary conditions correspond to the ordered liquid structures close to the solid walls. the slip, no-slip and locking interfacial parameters yield the positive, zero and negative slip lengths respectively. the three types of boundary conditions existing in "microscale" still occur in "macroscale". however, the slip lengths weakly dependent on the channel sizes yield the real shear rates and the slip velocity relative to the solid wall traveling speed approaching those with the no-slip boundary condition when the channel size is larger than thousands of liquid molecular diameters for all of the three types of interfacial parameters, leading to the quasi-no-slip boundary conditions. (c) 2007 elsevier ltd. all rights reserved.
WOS关键词	MOLECULAR-DYNAMICS SIMULATION ; HYDROPHOBIC SURFACES ; NEWTONIAN FLUID ; SHEAR-FLOW ; SLIP ; INTERFACE ; WATER ; NANOBUBBLES ; MICROSCALE ; ROUGHNESS
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000246538800014
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2382624
专题	中国科学院大学
通讯作者	Xu, Jinliang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Micro Energy Syst Lab, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Xu, Jinliang,Li, Yuxiu. Boundary conditions at the solid-liquid surface over the multiscale channel size from nanometer to micron[J]. International journal of heat and mass transfer,2007,50(13-14):2571-2581.
APA	Xu, Jinliang,&Li, Yuxiu.(2007).Boundary conditions at the solid-liquid surface over the multiscale channel size from nanometer to micron.International journal of heat and mass transfer,50(13-14),2571-2581.
MLA	Xu, Jinliang,et al."Boundary conditions at the solid-liquid surface over the multiscale channel size from nanometer to micron".International journal of heat and mass transfer 50.13-14(2007):2571-2581.

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