Spinodal Decomposition in Binary Gases

Preprint

19 March 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.patt-sol/9703006

Abstract

We carried out three-dimensional simulations, with about 1.4 million particles, of phase segregation in a low density binary fluid mixture, described mesoscopically by energy and momentum conserving Boltzmann-Vlasov equations. Using a combination of Direct Simulation Monte Carlo(DSMC) for the short range collisions and a version of Particle-In-Cell(PIC) evolution for the smooth long range interaction, we found dynamical scaling after the ratio of the interface thickness(whose shape is described approximately by a hyperbolic tangent profile) to the domain size is less than ~0.1. The scaling length R(t) grows at late times like t^alpha, with alpha=1 for critical quenches and alpha=1/3 for off-critical ones. We also measured the variation of temperature, total particle density and hydrodynamic velocity during the segregation process.

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All Related Versions

Version 1, 1997-03-19, ArXiv
Published version: Physical Review Letters, 78 (18), 3499.

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