Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Boundary conditions at the solid-liquid surface over the multiscale channel size from nanometer to micron | |
| Xu, Jinliang; Li, Yuxiu | |
| 2007-07-01 | |
| Source Publication | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
 |
| ISSN | 0017-9310 |
| Volume | 50Issue:13-14Pages:2571-2581 |
| Corresponding Author | xujl@ms.giec.ac.cn |
| Abstract | 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. |
| Subtype | Article |
| Other Abstract | 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. |
| Keyword | Boundary Condition Slip Length Interfacial Parameter Channel Size |
| WOS Headings | Science & Technology ; Physical Sciences ; Technology |
| DOI | 10.1016/j.ijheatmasstransfer.2006.11.031 |
| WOS Subject Extended | Thermodynamics ; Engineering ; Mechanics |
| URL | 查看原文 |
| WOS Keyword | MOLECULAR-DYNAMICS SIMULATION ; HYDROPHOBIC SURFACES ; NEWTONIAN FLUID ; SHEAR-FLOW ; SLIP ; INTERFACE ; WATER ; NANOBUBBLES ; MICROSCALE ; ROUGHNESS |
| Indexed By | SCI |
| Language | 英语 |
| WOS Subject | Thermodynamics ; Engineering, Mechanical ; Mechanics |
| WOS ID | WOS:000246538800014 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/3480 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 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 |
| Recommended Citation 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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