论文标题
局部驱动的悬浮液中远距离平衡和近平衡动力学之间的空间交叉
The Spatial Crossover between Far-From-Equilibrium and Near-Equilibrium Dynamics in Locally Driven Suspensions
论文作者
论文摘要
我们检查了准二维胶体悬浮液对光学镊子引起的局部循环驾驶的响应。这种方法是一种微观版本的流变计，使我们能够在péclet编号（$ pe $）中解决三个数量级以上，并直接观察悬架的急剧空间交叉。特别是，颗粒从高到低$ pe $区域迁移，并形成强烈的不均匀稳态密度剖面，其长度尺度不取决于粒子密度，并由$ pe \ \ \ \ y of1 $设置。我们表明，现象学的两相液体组成模型与我们的结果一致。
We examine the response of a quasi-two-dimensional colloidal suspension to a localized circular driving induced by optical tweezers. This approach, a microscale version of rheometry, allows us to resolve over three orders of magnitude in Péclet number ($Pe$) and provide a direct observation of a sharp spatial crossover from far- to near-thermal-equilibrium regions of the suspension. In particular, particles migrate from high to low $Pe$ regions and form strongly inhomogeneous steady-state density profiles with an emerging length scale that does not depend on the particle density and is set by $Pe\approx1$. We show that the phenomenological two phase fluid constitutive model is in line with our results.
