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Resolving the microscopic hydrodynamics at the moving contact line

Amal K. Giri1, Paolo Malgaretti1, Dirk Peschka2, and Marcello Sega1,*

  • 1Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Cauerstrasse 1, D-91058 Erlangen, Germany
  • 2Weierstrass Institute Berlin, Mohrenstrasse 39, D-10117 Berlin, Germany

  • *m.sega@ucl.ac.uk; Present address: Department of Chemical Engineering, University College London, London WC1E 7JE, United Kingdom.
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Phys. Rev. Fluids 7, L102001 – Published 10 October, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.L102001

Abstract

The molecular structure of moving contact lines (MCLs) and the emergence of a corresponding macroscopic dissipation have made the MCL a paradigm of fluid dynamics. Through novel averaging techniques that remove capillary waves smearing we achieve an unprecedented resolution in molecular dynamics simulations and find that they match with the continuum description obtained by finite element method down to molecular scales. This allows us to distinguish dissipation at the liquid-solid interface (Navier-slip) and at the contact line, the latter being negligible for the rather smooth substrate considered.

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Phys. Rev. Fluids 7, L102001– Published 10 October, 2022
  • Received 30 June 2022
  • Accepted 15 September 2022
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