标题： 液-液界面处瑞利-普拉托不稳定性分子动力学研究 显示英文标题

标题： Molecular Dynamics Study of Rayleigh-Plateau Instability at Liquid-Liquid Interfaces

摘要： 我们使用分子动力学模拟研究了两种等粘度不混溶液体界面处的瑞利-普拉特不稳定性。 我们检查了两种初始条件：一种是在界面处涉及单模态扰动，另一种是没有施加任何扰动。 在单模态扰动下的增长率与经典理论有很强的一致性，尤其是在大圆柱半径的情况下。然而，对于较小的半径，增长率与理论预测有显著偏差。 这种差异可以归因于热涨落或圆柱体内外压力差的影响。 相反，在无扰动的初始条件下，我们观察到破裂时间和最小半径之间的关系，其中幂指数随着半径减小而减小。 这一结果表明，热涨落在更小尺寸的系统中影响更为显著。 本研究表明，施加单模态扰动能够有效抑制热噪声和模式耦合，从而得到与线性稳定性分析预测一致的增长率。 显示英文摘要

摘要： We investigated the Rayleigh-Plateau instability at the interface between two immiscible liquids of equal viscosity using molecular dynamics simulations. We examined two types of initial conditions: one involving a single-mode perturbation at the interface and the other without any imposed perturbation. The growth rate under single-mode perturbation showed strong agreement with classical theory, particularly for large cylinder radii.However, for smaller radii, the growth rate deviated significantly from the theoretical prediction. This discrepancy can be attributed to the effects of thermal fluctuations or pressure differences between the inside and outside of a cylinder. In contrast, with initial conditions free of perturbation, we observed a relationship between breakup time and minimum radius, where the power exponent decreased as the radius decreased. This result suggests that thermal fluctuations have a more substantial impact on systems of smaller dimensions. This study demonstrated that imposing single-mode perturbations effectively suppresses thermal noise and mode coupling, thereby yielding growth rates consistent with those predicted by linear stability analysis.