致密活性悬浮液中各向异性示踪剂的最优输运
Optimal Transport of an Anisotropic Tracer in Dense Active Suspensions
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中文总结 AI 辅助
通过布朗动力学模拟揭示致密活性悬浮液中各向异性示踪剂的输运特性，发现其平动与转动输运随活性哑铃面积分数呈非单调变化，且长轴方向输运更强，建立了活性哑铃集体组织与示踪剂输运的关联。
中文摘要 AI 辅助
活性流体中各向异性示踪剂的输运因粒子形状、活性与空间位阻相互作用的耦合而呈现丰富的动力学行为。我们采用布朗动力学模拟，研究浸没在活性哑铃悬浮液中的椭圆形示踪剂的运动。结果表明，随活性哑铃的面积分数φ增大，示踪剂的平动和转动输运（由均方速度和扩散系数表征）均增强一个数量级以上；值得注意的是，示踪剂沿长轴的运动增强程度高于短轴，满足v∥>v⊥且D∥>D⊥。尤为显著的是，平动与转动输运均在活性哑铃的中等堆积分数处达到最优，更高密度下对应的输运系数会下降。我们证实，这种非单调输运源于活性哑铃在示踪剂周围的各向异性积累与聚集，其控制着非平衡力和力矩的涨落，从而在示踪剂表面活性哑铃的集体组织与其涌现的平动、转动输运之间建立了直接关联。
英文摘要
The transport of anisotropic tracers in active fluids exhibits rich dynamical behavior arising from the interplay between particle shape, activity, and steric interactions. We employ Brownian dynamics simulations to investigate the motion of an elliptical tracer immersed in a suspension of active dumbbells. We find that both translational and rotational transport, characterized by the mean-square speed and diffusivity, are enhanced by more than an order of magnitude with increasing area fraction, $ϕ$, of active dumbbells. Notably, tracer motion is enhanced along the major axis relative to the minor axis, with $\mathrm{v}_{\parallel}>\mathrm{v}_{\perp}$ and $D_{\parallel}>D_{\perp}$. Remarkably, both translational and rotational transport exhibit an optimum at an intermediate packing fraction of active dumbbells, with the corresponding transport coefficients decreasing at higher densities. We show that this non-monotonic transport arises from the anisotropic accumulation and aggregation of active dumbbells around the tracer, which control the non-equilibrium force and torque fluctuations. Thus, establish a direct connection between the collective organization of active dumbbells at the tracer surface and its emergent translational and rotational transport.
发表机构
- Indian Institute of Science Education and Research, Bhopal（印度科学教育研究所博帕尔分校）
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