Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India.
Department of Engineering Design, Indian Institute of Technology Madras, Chennai 600036, India.
J Chem Phys. 2017 Aug 21;147(7):074703. doi: 10.1063/1.4999096.
We investigate the phase separation behavior of binary mixtures in two-dimensional periodic and confined domains using dissipative particle dynamics. Two canonical problems of fluid mechanics are considered for the confined domains: square cavity with no-slip walls and lid-driven cavity with one driven wall. The dynamics is studied for both weakly and strongly separating mixtures and different area fractions. The phase separation process is analyzed using the structure factor and the total interface length. The dynamics of phase separation in the square cavity and lid-driven cavity are observed to be significantly slower when compared to the dynamics in the periodic domain. The presence of the no-slip walls and the inertial effects significantly influences the separation dynamics. Finally, we show that the growth exponent for the strongly separating case is invariant to changes in the inter-species repulsion parameter.
我们使用耗散粒子动力学研究了二元混合物在二维周期性和受限域中的相分离行为。对于受限域，考虑了两个经典的流体力学问题：无滑移壁方腔和一个驱动壁的驱动腔。研究了弱分离和强分离混合物以及不同面积分数的动力学。使用结构因子和总界面长度分析相分离过程。与周期性域相比，观察到方腔和驱动腔中的相分离动力学明显较慢。无滑移壁的存在和惯性效应显著影响分离动力学。最后，我们表明，强分离情况下的生长指数与种间排斥参数的变化无关。
