Adiabatic waves along interfacial layers near the critical point

TL;DR

This paper investigates adiabatic waves along interfacial layers near the critical point, revealing a new wave type influenced by density derivatives and critical proximity, based on thermocapillary fluid equations.

Contribution

It introduces a novel class of adiabatic waves along interfacial zones near the critical point, derived from non-local energy considerations and thermocapillary fluid dynamics.

Findings

Identification of a new adiabatic wave type near the critical point

Wave speed depends on the proximity to the critical point

Waves are linked to second derivatives of density

Abstract

Near the critical point, isothermal interfacial zones are investigated starting from a non-local density of energy. From the equations of motion of thermocapillary fluids, we point out a new kind of adiabatic waves propagating along the interfacial layers. The waves are associated with the second derivatives of densities and propagate with a celerity depending on the proximity of the critical point.