Molecular interpretation of the non-Newtonian viscoelastic behavior of liquid water at high frequencies

Julius C.F. Schulz, Alexander Schlaich, Matthias Heyden, Roland R. Netz, Julian Kappler

Research output: Contribution to journalArticlepeer-review

Abstract

Using classical as well as ab initio molecular dynamics simulations, we calculate the frequency-dependent shear viscosity of pure water and water-glycerol mixtures. In agreement with recent experiments, we find deviations from Newtonian-fluid behavior in the THz regime. Based on an extension of the Maxwell model, we introduce a viscoelastic model to describe the observed viscosity spectrum of pure water. We find four relaxation modes in the spectrum which we attribute to (i) hydrogen-bond network topology changes, (ii) hydrogen-bond stretch vibrations of water pairs, (iii) collective vibrations of water molecule triplets, and (iv) librational excitations of individual water molecules. Our model quantitatively describes the viscoelastic response of liquid water on short timescales, where the hydrodynamic description via a Newtonian-fluid model breaks down.

Original languageEnglish (US)
Article number103301
JournalPhysical Review Fluids
Volume5
Issue number10
DOIs
StatePublished - Oct 2020

ASJC Scopus subject areas

  • Computational Mechanics
  • Modeling and Simulation
  • Fluid Flow and Transfer Processes

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