Relation between boundary slip mechanisms and water-like fluid behavior

TL;DR

This study uses molecular dynamics simulations to explore how water-like fluids slip at solid boundaries, revealing different slip mechanisms at varying shear levels and their relation to fluid layering and anomalies.

Contribution

It uncovers the connection between slip mechanisms and fluid anomalies, detailing how defect and global slip relate to shear and layering in water-like fluids.

Findings

Defect slip involves particle exchange at low shear.

Global slip correlates with homogeneous fluid distribution.

Transition velocity oscillations relate to layering changes.

Abstract

The slip of a fluid layer in contact with a solid confining surface is investigated for different temperatures and densities using molecular dynamic simulations. We show that for an anomalous water-like fluid the slip goes as follows: for low levels of shear, the defect slip appears and is related with the particle exchange between the fluid layers; at high levels of shear, the global slip occurs and is related to the homogeneous distribution of the fluid in the confining surfaces. The oscillations in the transition velocity from the defect to the global slip is shown to be associated with changes in the layering distribution in the anomalous fluid.