Fluctuating diffusivity emerges even in binary gas mixtures
Fluctuating diffusivity emerges even in binary gas mixtures
复制标题
即使在二元气体混合物中也会出现波动的扩散率
DOI：
10.1103/physreve.107.014605
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发表时间：
2023
影响因子：
2.4
通讯作者：
Uneyama Takashi
中科院分区：
文献类型：
--
作者：
Nakai Fumiaki;Masubuchi Yuichi;Doi Yuya;Ishida Takato;Uneyama Takashi
某些软物质和生物系统中的扩散率随时间而变化，称为波动扩散率。在这项工作中，我们提出了一个新的起源波动扩散率的基础上随机模拟的二元气体混合物。在该系统中，一种组分的分数非常小，并且次要组分分子的质量不同于主要组分的质量。当次要组分的质量足够小于主要组分的质量时，次要组分表现出波动的扩散率。我们阐明，这种波动的扩散率是由时间尺度分离的速度方向和次要组分分子的速度之间的弛豫。
Diffusivity in some soft matter and biological systems changes with time, called the fluctuating diffusivity. In this work, we propose a novel origin for fluctuating diffusivity based on stochastic simulations of binary gas mixtures. In this system, the fraction of one component is significantly small, and the mass of the minor component molecule is different from that of the major component. The minor component exhibits fluctuating diffusivity when its mass is sufficiently smaller than that of the major component. We elucidate that this fluctuating diffusivity is caused by the time scale separation between the relaxation of the velocity direction and the speed of the minor component molecule.