Viscosity bounds in liquids with different structure and bonding types

Abstract

Recently, it was realised that liquid viscosity has a lower bound which is nearly constant for all liquids and is governed by fundamental physical constants. This was supported by experimental data in noble and molecular liquids. Here, we perform large-scale molecular dynamics simulations to ascertain this bound in two other important liquid types: the ionic molten salt system LiF and metallic Pb. We find that these ionic and metallic systems similarly have lower viscosity bounds corresponding to the minimum of kinematic viscosity of about 10${}^{-7}$ $\frac{{\mathrm{m}}^2}{\mathrm{s}}$. We show that this agrees with experimental data in other systems with different structures and bonding types, including noble, molecular, metallic and covalent liquids. This expands the universality of viscosity bounds into the main system types known.

arXiv comment6 pages, 7 figures

References in corpus (11)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Static and Dynamic Properties of a Viscous Silica Melt Molecular Dynamics Computer Simulations
• Minimal quantum viscosity from fundamental physical constants
• Transition in the supercritical state of matter: experimental evidence
• The Structure of Molten FLiNaK
• Bounds on transport from univalence and pole-skipping
• Universal lower bounds on energy and momentum diffusion in liquids
• The Purcell question: why do all viscosities stop at the same place?
• Minima of shear viscosity and thermal conductivity coefficients of classical fluids
• Universal interrelation between dynamics and thermodynamics of fluids: dynamically-driven "c"-transition
• Properties of condensed matter from fundamental physical constants

Cited by in corpus (1)

• Thermodynamics and transport in molten chloride salts and their mixtures