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arXiv 2202.00233cond-mat.softphysics.bio-phphysics.chem-ph
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手性活性粒子在Poiffille流中的扩散

Diffusion of chiral active particles in a Poiseuille flow

Narender Khatri, P. S. Burada

备注：
16 Pages, 8 Figures; Manuscript to be appear in Physical Review E
发表信息：
Phys. Rev. E 105, 024604 (2022)
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摘要：

研究了具有Poiffille流的二维微通道中手性活性布朗粒子的扩散行为。通过数值模拟，我们发现粒子的输运系数，例如平均速度$v$和有效扩散系数$D_{eff}$，强烈地依赖于流动强度$u_0$、平移扩散常数$D_0$、旋转扩散速率$D_θ$和活性粒子的手性$Ω$ .它表明，颗粒可以表现出上游漂移，导致负$v$，为最佳参数值的$u_0$，$D_θ$，和$Ω$。有趣的是，可以通过调整这些参数来控制$v$的方向。我们观察到，对于某些最佳值的$u_0$和$Ω$，手性粒子聚集在通道壁附近，相应的$D_{eff}$增强。然而，对于非手性粒子（$Ω= 0$），$D_{eff}$被抑制的存在下的Poiffille流。预计这些发现对于开发用于分离活性颗粒的微流体和芯片实验室设备具有很大的潜力。

英文摘要：

We study the diffusive behavior of chiral active (self-propelled) Brownian particles in a two-dimensional microchannel with a Poiseuille flow. Using numerical simulations, we show that the behavior of the transport coefficients of particles, for example, the average velocity $v$ and the effective diffusion coefficient $D_{eff}$, strongly depends on flow strength $u_0$, translational diffusion constant $D_0$, rotational diffusion rate $D_θ$, and chirality of the active particles $Ω$. It is demonstrated that the particles can exhibit upstream drift, resulting in a negative $v$, for the optimal parameter values of $u_0$, $D_θ$, and $Ω$. Interestingly, the direction of $v$ can be controlled by tuning these parameters. We observe that for some optimal values of $u_0$ and $Ω$, the chiral particles aggregate near a channel wall, and the corresponding $D_{eff}$ is enhanced. However, for the nonchiral particles ($Ω= 0$), the $D_{eff}$ is suppressed by the presence of Poiseuille flow. It is expected that these findings have a great potential for developing microfluidic and lab-on-a-chip devices for separating the active particles.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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