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Liquid slip over gas nanofilms

Srinivasa B. Ramisetti1,*, Matthew K. Borg1, Duncan A. Lockerby2, and Jason M. Reese1

  • 1School of Engineering, University of Edinburgh, Edinburgh EH9 3FB, United Kingdom
  • 2School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom

  • *ramisettisrinivas@yahoo.com
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Phys. Rev. Fluids 2, 084003 – Published 7 August, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.084003

Abstract

We propose the rarefied-gas-cushion model (r-GCM), as an extended version of the gas-cushion model (GCM), to estimate the apparent slip of water flowing over a gas layer trapped at a solid surface. Nanobubbles or gas nanofilms may manifest rarefied-gas effects and the r-GCM incorporates kinetic boundary conditions for the gas component in the slip Knudsen regime. These enable an apparent hydrodynamic slip length to be calculated given the gas thickness, the Knudsen number, and the bulk fluid viscosities. We assess the r-GCM through nonequilibrium molecular dynamics (NEMD) simulations of shear-driven liquid flow over an infinite gas nanofilm covering a solid surface, from the gas slip regime to the early transition regime, beyond which NEMD is computationally impractical. We find that, over the flow regimes examined, the r-GCM provides better predictions of the apparent liquid slip and retrieves both the GCM and the free-molecular behavior in the appropriate limits.

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Phys. Rev. Fluids 2, 084003– Published 7 August, 2017
  • Received 13 January 2017
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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