论文标题
即使在二元气体混合物中也出现了波动的扩散率
Fluctuating Diffusivity Emerges even in Binary Gas Mixtures
论文作者
论文摘要
某些软物质和生物系统的扩散率随时间变化，称为波动扩散率。在这项工作中，我们提出了一个新的起源，以基于二元气体混合物的随机模拟而波动扩散。在该系统中，一个成分的分数显着很小，次要分子的质量与主要成分的质量不同。当其质量足够小于主要成分的质量时，次要成分的扩散率波动。我们阐明这种波动的扩散率是由速度方向的松弛与小分子分子的速度之间的时间尺度分离引起的。
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.
