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    Modeling and simulations for molecular scale hydrodynamics of the moving contact line in immiscible two-phase flows

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    Type
    Article
    Authors
    Qian, Tiezheng
    Wu, Congmin
    Lei, Siu Long
    Wang, Xiao Ping
    Sheng, Ping
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2009-10-29
    Online Publication Date
    2009-10-29
    Print Publication Date
    2009-11-18
    Permanent link to this record
    http://hdl.handle.net/10754/600260
    
    Metadata
    Show full item record
    Abstract
    This paper starts with an introduction to the Onsager principle of minimum energy dissipation which governs the optimal paths of deviation and restoration to equilibrium. Then there is a review of the variational approach to moving contact line hydrodynamics. To demonstrate the validity of our continuum hydrodynamic model, numerical results from model calculations and molecular dynamics simulations are presented for immiscible Couette and Poiseuille flows past homogeneous solid surfaces, with remarkable overall agreement. Our continuum model is also used to study the contact line motion on surfaces patterned with stripes of different contact angles (i.e. surfaces of varying wettability). Continuum calculations predict the stick-slip motion for contact lines moving along these patterned surfaces, in quantitative agreement with molecular dynamics simulation results. This periodic motion is tunable through pattern period (geometry) and contrast in wetting property (chemistry). The consequence of stick-slip contact line motion on energy dissipation is discussed. © 2009 IOP Publishing Ltd.
    Citation
    Qian T, Wu C, Lei SL, Wang X-P, Sheng P (2009) Modeling and simulations for molecular scale hydrodynamics of the moving contact line in immiscible two-phase flows. J Phys: Condens Matter 21: 464119. Available: http://dx.doi.org/10.1088/0953-8984/21/46/464119.
    Sponsors
    This work was supported by the Hong Kong RGC grants CA05/06. SC01 and HKUST 602007 and the Croucher Foundation Grant Z0138.
    Publisher
    IOP Publishing
    Journal
    Journal of Physics: Condensed Matter
    DOI
    10.1088/0953-8984/21/46/464119
    PubMed ID
    21715883
    ae974a485f413a2113503eed53cd6c53
    10.1088/0953-8984/21/46/464119
    Scopus Count
    Collections
    Physical Science and Engineering (PSE) Division; Publications Acknowledging KAUST Support

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