Browse > Article
http://dx.doi.org/10.5293/KFMA.2010.13.2.005

Effects of Surface Roughness and Interface Wettability in a Nanochannel  

Choo, Yun-Sik (한양대학교 대학원 기계공학과)
Seo, In-Soo (한양대학교 대학원 기계공학과)
Lee, Sang-Hwan (한양대학교 기계공학과)
Publication Information
The KSFM Journal of Fluid Machinery / v.13, no.2, 2010 , pp. 5-11 More about this Journal
Abstract
The nanofluidics is characterized by a large surface-to-volume ratio, so that the surface properties strongly affect the flow resistance. We present here the results showing that the effect of wetting properties and the surface roughness may considerably reduce the friction of fluid past the boundaries. For a simple fluid flowing over hydrophilic and hydrophobic surfaces, the influences of surface roughness are investigated by the nonequilibrium molecular dynamics (NEMD) simulations. The fluid slip at near a solid surface highly depends on the wall-fluid interaction. For hydrophobic surfaces, apparent fluid slips are observed on smooth and rough surfaces. The solid wall is modeled as a rough atomic sinusoidal wall. The effects on the boundary condition of the roughness characteristics are given by the period and amplitude of the sinusoidal wall. It was found that the slip velocity for wetting conditions at interface decreases with increasing effects of surface roughness. The results show the surface rougheness and wettability determines the slip or no-slip boundary conditions. The surface roughness geometry shows significant effects on the boundary conditions at the interface.
Keywords
Molecular Dynamics; Nanochannel; interface wettability; Surface Roughness;
Citations & Related Records
연도 인용수 순위
  • Reference
1 B.D. Todd and Denis J. Evans, 1997, “Temperature profile for Poiseuille flow”, Phys. Rev. E, Vol.55, pp. 2800-2807.   DOI
2 Roland Steitz, Thomas Gutberlet, Thomas Hauss, Beate Klosgen, Rumen Krastev, Sebastian Schemmel, Adam C. Simonsen, and Gerhard H. Findenegg, 2003, “nanobubbles and Their Precursor Layer at the Interface of Water Against a Hydrophobic Substrate”, Langmuir, Vol.19, pp. 2409-2418.   DOI
3 James W.G. Tyrrell and Phil Attard, 2001, “Images of nanobubbles on Hydrophobic Surfaces and Their Interactions”, Phys. Rev. Lett., Vol.87, pp. 176104.   DOI
4 S. Iarlori, P. Carnevali, F. Ercolessi, and E. Tosatti, 1989, “Dynamics of a Liquid-Metal Surface”, Europhys. Lett., 10, pp. 329-334.   DOI
5 A. Jabbarzadeh, J.D. Atkinson, and R.I. Tanner, 2000, “Effect of the wall roughness on slip and rheological properties of hexadecane in molecular dynamics simulation of Couette shear flow between two sinusoidal walls”, Phys. Rev. E, Vol.61, pp. 690-699.   DOI
6 Norio Ohtomo, Yukio Tanaka, 1987, “Liquid Argon : Molecular Dynamics Calculations for the dynamic properties”, J. Phys. Soc. Jap., Vol.56, pp. 2801-2813.   DOI
7 Bing-Yang Cao, Min Chen, and Zeng-Yuan Guo, 2006, “Effect of surface roughness on gas flow in microchannels by molecular dynamics simulation”, Int. J. Eng. Sci., Vol.44, pp. 927-937.   DOI
8 Gan Mo and Franz Rosenberger, 1990, “Molecular-dynamics simulation of flow in a two-dimensional channel with atomically rough walls”, Phys. Rev. A, Vol.42, pp. 4688-4692.   DOI
9 M.P. Allen, D.J. Tildesley, 1987, “Computer simulation of liquids”,Oxford University Press.
10 Jean-Louis Barrat and Lyderic Bocquet, 1999, “Large slip effect at a nonwetting fluid-solid interface”, Phys. Rev. Lett., Vol. 82, No. 23, pp. 4671-4674.   DOI
11 Elmar Bonaccurso, Hans-Jurgen Butt, and Vincent S.J. Craig, 2003, “Surface Roughness and Hydrodynamic Boundary Slip of a Newtonian Fluid in a Completely Wetting System”, Phys. Rev. Lett., Vol.90, pp. 144501.   DOI
12 J.G. Powles, S. Murad, and P.V. Ravi, 1992, “A new model for permable micropores”, Chem. Phys. Lett., Vol.188, pp. 21-24.   DOI
13 Denis J. Evans, William G. Hoover, Bruce H. Failor, Bill Moran, and Anthony J.C. Ladd, 1983, “Nonequilibrium molecular dynamics via Gauss’s principle of least constraint”, Phys. Rev. A, Vol.28, pp. 1016-1021.   DOI
14 Martin W. Tysanner and Alejandro L. Garcia, 2004, “Measurement bias of fluid velocity in molecular simulations”, J. Comp. Phys., Vol.196, pp. 173-183.   DOI
15 Chiara Neto, Drew R Evans, Elmar Bonaccurso, Hans-Jurgen Butt, and Vincent S J Craig, 2005, “Boundary slip in Newtonian liquids : a review of experimental studies”, Rep. Prog. Phys. Vol.68, pp. 2859-2897.   DOI
16 Gad-el-Hak, 2002, “Flow physics in MEMS”, The MEMS Handbook, Boca Raton, FL:CRC Press.
17 Yingxi Zhu and Steve Granick, 2002, “Limits of the hydrodynamic no-slip boundary condition”, Phys. Rev. Lett., Vol.88, pp. 106102.   DOI
18 H.L. Zhao, C. Zhou, Y.X. Cai, and F.C. Zhang, 2008, “Nanostructure analysis of graded oxidation coated glass prepared by APCVD on-lin”, Materials Letter, Vol.62, pp. 140-142.   DOI
19 Jonathan S. Ellis and Michael Thompson, 2004, “Slip and coupling phenomena at the liquid-solid interface”, Phys. Chem. Chem. Phys., Vol.6, pp. 4928-4938.   DOI
20 Steve Granick, yincxi Zhu, and HyunJung Lee, 2003, “Slippery questions about complex fluids flowing past solids”, Nature Materials, Vol.2, pp. 221-227.   DOI
21 S. C. Yang, 2006, “Effects of surface roughness and interface wettability on nanoscale flow in a nanochannel”, Microfluid nanofluid, Vol. 2, pp. 501-511.   DOI
22 Cecile Cottin-Bizonne, Jean-Louis Barrat, Lyderic Bocquet and Elisabeth Charlaix, 2003, “Low-fricition flows of liquid at nanopatterned interfaces”, Nat. Mater.t, Vol. 2, pp. 237-240.   DOI