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Near-wall depletion and layering affect contact line friction of multicomponent liquids

Michele Pellegrino and Berk Hess

  • Swedish e-Science Research Center, Science for Life Laboratory, Department of Applied Physics KTH, Stockholm 100 44, Sweden

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Phys. Rev. Fluids 9, 034002 – Published 19 March, 2024

DOI: https://doi.org/10.1103/PhysRevFluids.9.034002

Abstract

The main causes of energy dissipation in micro- and nanoscale wetting are viscosity and liquid-solid friction localized in the three-phase contact line region. Theoretical models predict the contact line friction coefficient to correlate with the shear viscosity of the wetting fluid. Experiments conducted to investigate such correlation have not singled out a unique scaling law between the two coefficients. We perform molecular dynamics simulations of liquid water-glycerol droplets wetting silicalike surfaces, aimed to demystify the effect of viscosity on contact line friction. The viscosity of the fluid is tuned by changing the relative mass fraction of glycerol in the mixture and it is estimated both via equilibrium and nonequilibrium molecular dynamics simulations. Contact line friction is measured directly by inspecting the velocity of the moving contact line and the microscopic contact angle. It is found that the scaling between contact line friction and viscosity is sublinear, contrary to the prediction of molecular kinetic theory. The disagreement is explained by accounting for the depletion of glycerol in the near-wall region. A correction is proposed, based on multicomponent molecular kinetic theory and the definition of a rescaled interfacial friction coefficient.

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Phys. Rev. Fluids 9, 034002– Published 19 March, 2024
  • Received 14 August 2023
  • Accepted 8 February 2024
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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. Funded by Bibsam.

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