论文标题
在细胞流中自螺旋颗粒的扩散特性
Diffusion properties of self-propelled particles in cellular flows
论文作者
论文摘要
我们研究了由稳定的层流流动的自旋细胞粒子的动力学。自属性粒子的持续运动用活跃的Ornstein-Uhlenbeck过程描述。我们专注于粒子的扩散特性，这是持续时间和自由扩散系数的函数，揭示了非单调行为，并且发生了较大持久时间的制度的最小和陡峭生长。在后一个极限中，我们获得了通过活性力参数的扩散系数缩放系数的分析预测。我们的研究阐明了不均匀环境对活性颗粒的扩散的影响，例如活性微生物和流体中流动性浮游植物。
We study the dynamics of a self-propelled particle advected by a steady laminar flow. The persistent motion of the self-propelled particle is described by an active Ornstein-Uhlenbeck process. We focus on the diffusivity properties of the particle as a function of persistence time and free-diffusion coefficient, revealing non-monotonic behaviors, with the occurrence of a minimum and steep growth in the regime of large persistence time. In the latter limit, we obtain an analytical prediction for the scaling of the diffusion coefficient with the parameters of the active force. Our study sheds light on the effect of an inhomogeneous environment on the diffusion of active particles, such as living microorganisms and motile phytoplankton in fluids.
