Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Activity-controlled clogging and unclogging of micro-channels   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.

1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph