Semi-analytical calculations for parameters of boiling layer in isetropic expansion of warm dense matter with van der Waals equation of state

TL;DR

This paper presents semi-analytical calculations of the boiling layer parameters during isentropic expansion of warm dense matter using the van der Waals equation of state, highlighting phase freezeout phenomena.

Contribution

It introduces a semi-analytical approach to describe the thermo-hydrodynamics of warm dense matter expansion with van der Waals EOS, focusing on the formation of boiling layers.

Findings

Analysis of idealized self-similar behavior at phase boundaries

Identification of conditions for liquid layer formation during expansion

Discussion of phase freezeout implications for matter states

Abstract

Features and parameters of \boiling" liquid layer, which arises under conditions of isentropic expansion of warm dense matter (WDM), are stud- ied with the use of simplest van der Waals equation of state (EOS). Advan- tage of this EOS is possibility of demonstrable and semi-analytical descrip- tion of thermo- and hydrodynamics of the process. Idealized self-similar case of behavior of matter on interception of equilibrium (not metastable) isoentropic curve and boundary of gas-liquid coexistence curve (binodal) is analyzed. The possibility of formation of such "liquid layer" was studied previously in [1] during solving the problem of ablation of metal surface under the action of strong laser radiation. Peculiarity of such "freezing" of finite portion of expanding matter in the state, which corresponds to the binodal of gas-liquid or/and other phase transitions|so called "phase freezeout"and prospects of applications of this phenomenon for intended generation of uniform and extensive zone of previously unexplored states of matter were discussed in [2].