微通道的活性控制堵塞和疏通
Activity-controlled clogging and unclogging of micro-channels
摘要：
我们提出了一种机制，以控制形成稳定的障碍物在二维微通道的可变截面利用独特的集群属性的活性系统。在由外部刺激激活的自推进下，系统根据以下原理表现为开关：通过开启自推进，颗粒变得活跃，甚至在非常低的密度下也会粘在壁上并形成生长层，最终阻塞通道瓶颈，而当关闭自推进时，阻塞物溶解。我们构建了相图区分堵塞和开放状态的密度和瓶颈宽度。平均堵塞时间的研究，作为密度和瓶颈宽度的函数，揭示了显着的主动堵塞，迅速响应于自推进打开的效率。由此产生的图片显示了一个深刻的差异，相对于通过缓慢的扩散动力学的吸引被动布朗磁盘获得的堵塞。这项数值计算工作提出了一种新的方法，使用外部可调的自推进粒子在微通道中创建或破坏塞子。
英文摘要：
We propose a mechanism to control the formation of stable obstructions in two-dimensional micro-channels of variable sections taking advantage of the peculiar clustering property of active systems. Under the activation of the self-propulsion by external stimuli, the system behaves as a switch according to the following principle: by turning-on the self-propulsion the particles become active and even at very low densities stick to the walls and form growing layers eventually blocking the channel bottleneck, while the obstruction dissolves when the self-propulsion is turned off. We construct the phase diagram distinguishing clogged and open states in terms of density and bottleneck width. The study of the average clogging time, as a function of density and bottleneck width, reveals the marked efficiency of the active clogging that swiftly responds to the self-propulsion turning on. The resulting picture shows a profound difference with respect to the clogging obtained through the slow diffusive dynamics of attractive passive Brownian disks. This numerical work suggests a novel method to use particles with externally tunable self-propulsion to create or destroy plugs in micro-channels.
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