 98593 S. Bastea, J. L. Lebowitz
 Spinodal Decomposition in Binary Gases
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Sep 9, 98

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Abstract. We carried out threedimensional simulations, with about
$1.4\times10^6$ particles, of phase segregation in a low density
binary fluid mixture, described mesoscopically by energy and momentum
conserving BoltzmannVlasov equations. Using a combination of Direct
Simulation Monte Carlo(DSMC) for the short range collisions and a
version of ParticleInCell(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
$\sim0.1$. The scaling length $R(t)$ grows at late times like
$t^\alpha$, with $\alpha=1$ for critical quenches and
$\alpha=\frac{1}{3}$ for offcritical ones. We also measured the
variation of temperature, total particle density and hydrodynamic
velocity during the segregation process.
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