Memory-induced motion reversal in Brownian liquids.

Memory-induced motion reversal in Brownian liquids.
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布朗液体中记忆引起的运动逆转

DOI:
10.1039/c9sm02005e
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发表时间:
2020
期刊:
影响因子:
3.4
通讯作者:
Matthias Schmidt
Matthias Schmidt
中科院分区:
化学2区
文献类型:
--
作者:
Lucas L. Treffenstädt;Matthias Schmidt

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我们利用事件驱动的布朗动力学模拟和幂函数理论研究了空间非均匀剪切下硬球的布朗动力学。我们研究密度和电流分布的稳态和瞬态动力学后,打开和关闭外部方波剪切力场。我们发现,一个致密的硬球流体(体积分数为<$0.35)进行全球运动逆转后关闭剪切力场。我们使用幂泛函理论与空间非局部记忆内核来描述超绝热力的贡献,并获得良好的定量协议的理论结果与模拟数据。该理论提供了一个解释的运动逆转:内部超绝热非平衡力,反对外部驱动的电流出现由于关闭后的记忆。这种效应是真正的粘弹性:在稳定状态下,粘性力与电流相反,但在关闭后,它们弹性地产生相反的电流。
We study the Brownian dynamics of hard spheres under spatially inhomogeneous shear, using event-driven Brownian dynamics simulations and power functional theory. We examine density and current profiles both for steady states and for the transient dynamics after switching on and switching off an external square wave shear force field. We find that a dense hard sphere fluid (volume fraction ≈0.35) undergoes global motion reversal after switching off the shear force field. We use power functional theory with a spatially nonlocal memory kernel to describe the superadiabatic force contributions and obtain good quantitative agreement of the theoretical results with simulation data. The theory provides an explanation for the motion reversal: internal superadiabatic nonequilibrium forces that oppose the externally driven current arise due to memory after switching off. The effect is genuinely viscoelastic: in steady state, viscous forces oppose the current, but they elastically generate an opposing current after switch-off.
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