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Morphology and dynamics of phase-separating fluids with viscosity asymmetry

机译：粘度不对称的相分离流体的形态和动力学

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摘要

The effects of viscosity asymmetry of the components on morphology and dynamics of phase-separating AB fluids are investigated numerically based on a modified Model H. For critical mixtures, in the early stage of phase separation the co-continuous morphology with droplets of A in B and B in A is observed. In the late stage of phase separation, the viscosity asymmetry leads to morphological change from co-continuous structure to completely dispersed structure where the less viscous component forms droplet. The pathway of this transformation is accompanied by the breakdown of balance of volume fraction between droplets with different viscosity. Domain growth is characterized by a crossover from a faster growth at intermediate time under the influence of hydrodynamics to Lifshitz-Slyozov behavior at late times. For off-critical mixture, viscosity asymmetry only plays an important role for domain growth in the intermediate stage of phase separation and the domain growth depends on whether the more viscous phase is disperesed or continuous, and the late stage of domain growth follow Lifshitz-Slyozov power law independent of which phase is dispersed.
机译：基于改进的模型H，对组分的粘度不对称性对相分离AB流体的形态和动力学的影响进行了数值研究。对于关键混合物，在相分离的早期阶段，A与B中的A液滴共同连续地形成并且观察到A中的B。在相分离的后期，粘度不对称会导致形态从共连续结构变为完全分散的结构，在该结构中，粘度较小的成分会形成液滴。这种转变的途径伴随着具有不同粘度的液滴之间的体积分数平衡的破坏。域增长的特征是在流体动力学的影响下从中间时间的较快增长过渡到后期的Lifshitz-Slyozov行为。对于非临界混合物，粘度不对称仅在相分离的中间阶段对畴的生长起重要作用，并且畴的生长取决于更粘稠的相是分散的还是连续的，并且畴的生长后期遵循Lifshitz-Slyozov幂律与分散相无关。

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