COMPUTER-SIMULATIONS OF DOMAIN GROWTH AND PHASE-SEPARATION IN 2-DIMENSIONAL BINARY IMMISCIBLE FLUIDS USING DISSIPATIVE PARTICLE DYNAMICS

We investigate the dynamical behavior of binary fluid systems in two d imensions using dissipative particle dynamics. We find that following a symmetric quench the domain size R(t) grows with time t according to two distinct algebraic laws R(t)similar to t(n): at early times n=1/2 while for later times n=2/3. Following an asymmetric quench we observ e only n=1/2, and if momentum conservation is violated we see n=1/3 at early times. Bubble simulations confirm the existence, of a finite su rface tension and the validity of Laplace's law. Our results are compa red with similar simulations which have been performed previously usin g molecular dynamics, lattice-gas and lattice-Boltzmann automata, and Langevin dynamics. We conclude that dissipative particle dynamics is a promising method for simulating fluid properties in such systems.