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    Stick-Slip Motion of Moving Contact Line on Chemically Patterned Surfaces

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    Type
    Article
    Authors
    Wu, Congmin
    Lei, Siulong
    Qian, Tiezheng
    Wang, Xiaoping
    KAUST Department
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    SA-C0040
    UKC0016
    Date
    2010-06
    Online Publication Date
    2010-06
    Print Publication Date
    2010-06
    Permanent link to this record
    http://hdl.handle.net/10754/600263
    
    Metadata
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    Abstract
    Based on our continuum hydrodynamic model for immiscible two-phase flows at solid surfaces, the stick-slip motion has been predicted for moving contact line at chemically patterned surfaces [Wang et al., J. Fluid Mech., 605 (2008), pp. 59-78]. In this paper we show that the continuum predictions can be quantitatively verified by molecular dynamics (MD) simulations. Our MD simulations are carried out for two immiscible Lennard-Jones fluids confined by two planar solid walls in Poiseuille flow geometry. In particular, one solid surface is chemically patterned with alternating stripes. For comparison, the continuum model is numerically solved using material parameters directly measured in MD simulations. From oscillatory fluid-fluid interface to intermittent stick-slip motion of moving contact line, we have quantitative agreement between the continuum and MD results. This agreement is attributed to the accurate description down to molecular scale by the generalized Navier boundary condition in our continuum model. Numerical results are also presented for the relaxational dynamics of fluid-fluid interface, in agreement with a theoretical analysis based on the Onsager principle of minimum energy dissipation. © 2010 Global-Science Press.
    Citation
    Wu C, Lei S, Qian T, Wang X (2009) Stick-Slip Motion of Moving Contact Line on Chemically Patterned Surfaces. CiCP. Available: http://dx.doi.org/10.4208/cicp.2009.09.042.
    Sponsors
    This publication is based on work partially supported by Award No. SA-C0040/UKC0016, made by King Abdullah University of Science and Technology (KAUST), Hong Kong RGC grant CA05/06.SC01, and the Croucher Foundation Grant Z0138. T. Qian was also supported by Hong Kong RGC grant No. 602007.
    Publisher
    Global Science Press
    Journal
    Communications in Computational Physics
    DOI
    10.4208/cicp.2009.09.042
    ae974a485f413a2113503eed53cd6c53
    10.4208/cicp.2009.09.042
    Scopus Count
    Collections
    Physical Science and Engineering (PSE) Division; Publications Acknowledging KAUST Support

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