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

L. Biferale*, R. Benzi, M. Sbragaglia, S. Succi, F. Toschi

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

4 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)447-456
JournalJournal of Computer-Aided Materials Design
Volume14
Issue number3
DOIs
Publication statusPublished - 31 May 2007
Event1st International Conference on Synergy Between Experiment and Computation in Nanoscale Science 2006 - Harvard University, Cambridge, United States
Duration: 31 May 20063 Jun 2006
Conference number: 1

Keywords

  • Microfluidics
  • Lattice Boltzmann equation
  • Non ideal fluids

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