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Wetting/dewetting transition of two-phase flows in nano-corrugated channels

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Journal of Computer-Aided Materials Design

Abstract

A lattice version of the Boltzmann kinetic equation for describing multi-phase flows in nano- and micro-corrugated devices is reviewed. To this purpose, the Shan-Chen Lattice Boltzmann model [Phys. Rev. E 47, 1815 (1993)] for non-ideal fluids is extended to the case of confined geometries with hydrophobic properties on the wall. This extended Shan-Chen method is applied for the simulation of the wetting/dewetting transition in the presence of nanoscopic grooves etched on the boundaries. This approach permits to retain the essential supra-molecular details of fluid-solid interactions without surrendering -in fact boosting- the computational efficiency of continuum methods. The method is first validated against the Molecular Dynamics (MD) results of Cottin-Bizonne et al. [Nature Mater. 2, 237 (2003)] and then applied to more complex geometries, hardly accessible to MD simulations. The resulting analysis confirms that surface roughness and capillary effects can promote a sizeable reduction of the flow drag, with a substantial enhancement of the mass flow rates and slip-lengths, which can reach up to the micrometric range for highly hydrophobic surfaces.

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Authors and Affiliations

  1. Dipartimento di Fisica and INFN, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy

    L. Biferale & R. Benzi

  2. Department of Applied Physics, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands

    M. Sbragaglia

  3. Istituto per le Applicazioni del Calcolo CNR, Viale del Policlinico 137, 00161, Rome, Italy

    S. Succi & F. Toschi

  4. INFN, Sezione di Ferrara, via G. Saragat 1, 44100, Ferrara, Italy

    F. Toschi

Authors
  1. L. Biferale
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  2. R. Benzi
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  3. M. Sbragaglia
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  4. S. Succi
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  5. F. Toschi
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Correspondence to L. Biferale.

Additional information

This article is to be regarded part of the first Synergy Between Experiment and Computation in Nanoscale Science (NNIN/C) conference held in Cambridge, Massachusetts, U.S.A., 31 May–3 June 2006 proceedings published in the Journal of Computer-Aided Materials Design, Volume 14, No. 1, 2007.

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Biferale, L., Benzi, R., Sbragaglia, M. et al. Wetting/dewetting transition of two-phase flows in nano-corrugated channels. J Computer-Aided Mater Des 14, 447–456 (2007). https://doi.org/10.1007/s10820-007-9061-1

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  • DOI: https://doi.org/10.1007/s10820-007-9061-1

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