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Multi-scaling properties of phase segregation in quenched binary fluids: evidence from simulations

机译:骤冷二元流体中相偏析的多尺度性质:来自模拟的证据

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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. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 10]
机译:使用分子动力学研究了将近2万个颗粒的二维二元流体系统中的相分离过程。同一作者的先前研究表明,临界体积分数下的后期粗化状态由幂定律描述,幂定律以非普遍的方式取决于粒子间的相互作用和温度。然而,在低温区域,出现了一种渗透区域的三相态,其中原子域具有A型,B型和空位原子,使单长度尺度不变性无效。我们根据多长度尺度分析进行争论。特别地,对于我们用对称分子对电位进行研究的情况,我们提出了两个不同的长度尺度来表征动力学过程:一个与等原子域的平均大小相关,另一个与不可区分原子域的平均大小相关。在这种情况下,可以推断出两个不同的增长指数,但系统不会表现出规模不变性。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:10]

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