Effective confinement as origin of the equivalence of kinetic temperature and fluctuation-dissipation ratio in a dense shear-driven suspension.

Effective confinement as origin of the equivalence of kinetic temperature and fluctuation-dissipation ratio in a dense shear-driven suspension.
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有效约束是稠密剪切驱动悬浮液中动力学温度和波动耗散比等价的起源

DOI:
10.1103/physreve.85.021103
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发表时间:
2012
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
通讯作者:
T. Speck
T. Speck
中科院分区:
--
文献类型:
--
作者:
B. Lander;U. Seifert;T. Speck

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我们研究了在欠阻尼随机动力学控制下的剪切驱动悬浮液中标记粒子的响应和速度自相关函数。我们遵循致密悬浮液中有效约束的思想,并利用粒子重组和振动运动之间的时间尺度分离。这使我们能够以一种“混合”形式近似地导出波动-耗散定理,其中包括动能温度作为有效温度和加性修正项。我们在数值上表明,即使在中等密度的悬浮液中,后者也是可以忽略不计的。我们用一个简单的玩具模型,一个在剪切流中被捕获的单个粒子来讨论异同。
We study response and velocity autocorrelation functions for a tagged particle in a shear driven suspension governed by underdamped stochastic dynamics. We follow the idea of an effective confinement in dense suspensions and exploit a time scale separation between particle reorganization and vibrational motion. This allows us to approximately derive the fluctuation-dissipation theorem in a “hybrid” form involving the kinetic temperature as an effective temperatureandan additive correction term. We show numerically that even in a moderately dense suspension the latter is negligible. We discuss similarities and differences with a simple toy model, a single trapped particle in shear flow.
标记颗粒在驱动胶体悬浮液中的迁移和扩散
DOI: --
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