手性Janus粒子在对流辊中的扩散
Diffusion of Chiral Janus Particles in Convection Rolls
摘要：
通过大量的数值模拟研究了人工活性粒子在二维周期性静止对流单元中的扩散。在大Péclet数的极限下，即，对于低于某个脱钉阈值的自推进速度和弱的旋转-平移波动，粒子经历渐近正态扩散，扩散常数与其在零流量时的扩散常数的平方根成比例。在推进机制中的手征效应，在这里建模的可调施加扭矩，有利于相邻的对流辊之间的粒子的跳跃。滚动跳跃是由一个过量的扩散峰，这似乎是分开两个不同的活性扩散制度低和高的手征信号。我们的模拟结果的定性解释，提出了对这种现象进行全面分析研究的第一步。
英文摘要：
The diffusion of an artificial active particle in a two-dimensional periodic pattern of stationary convection cells is investigated by means of extensive numerical simulations. In the limit of large Péclet numbers, i.e., for self-propulsion speeds below a certain depinning threshold and weak roto-translational fluctuations, the particle undergoes asymptotic normal diffusion with diffusion constant proportional to the square root of its diffusion constant at zero flow. Chirality effects in the propulsion mechanism, modeled here by a tunable applied torque, favors particle's jumping between adjacent convection rolls. Roll jumping is signaled by an excess diffusion peak, which appears to separate two distinct active diffusion regimes for low and high chirality. A qualitative interpretation of our simulation results is proposed as a first step toward a fully analytical study of this phenomenon.
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