Multi-scaling properties of phase segregation in quenched binary fluids

G. Martı́nez, S. Gonçalves and J.R. Iglesias

Physica A: Statistical Mechanics and its Applications, 1998, vol. 257, issue 1, 380-384

Abstract: The phase separation process in two-dimensional binary fluid systems is investigated using molecular dynamics for almost 20 000 particles. Previous works from the same authors have shown that the late-stage coarsening regime at critical volume fractions is described by power laws whose exponents are dependent on particle–particle interactions and on temperature in a non-universal way. At the low-temperature region, however, the emergence of a three-phase regime of percolating domains with atoms of type-A, type-B and voids, invalidates the single-length scale invariance. We argue in terms of a multiple-length scale analysis. In particular, for the case we studied with symmetric molecular pair potentials we propose two divergent length scales to characterize the dynamic process: one associated to the average size of equal-atom domains and the other related to the average size of undistinguishable-atom domains. Two different growth exponents can be inferred in such a case but the system does not exhibit scale invariance.

Keywords: Phase seperation; Simulation; Fluids (search for similar items in EconPapers)
Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:257:y:1998:i:1:p:380-384

DOI: 10.1016/S0378-4371(98)00163-0

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