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Title: Clogging and depinning of ballistic active matter systems in disordered media

Abstract

We numerically examine ballistic active disks driven through a random obstacle array. Formation of a pinned or clogged state occurs at much lower obstacle densities for the active disks than for passive disks. As a function of obstacle density, we identify several distinct phases including a depinned fluctuating cluster state, a pinned single-cluster or jammed state, a pinned multicluster state, a pinned gel state, and a pinned disordered state. At lower active disk densities, a drifting uniform liquid forms in the absence of obstacles, but when even a small number of obstacles are introduced, the disks organize into a pinned phase-separated cluster state in which clusters nucleate around the obstacles, similar to a wetting phenomenon. Here in this paper, we examine how the depinning threshold changes as a function of disk or obstacle density and find a crossover from a collectively pinned cluster state to a disordered plastic depinning transition as a function of increasing obstacle density. We compare this to the behavior of nonballistic active particles and show that as we vary the activity from completely passive to completely ballistic, a clogged phase-separated state appears in both the active and passive limits, while for intermediate activity, a readily flowingmore » liquid state appears and there is an optimal activity level that maximizes the flux through the sample.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1483506
Alternate Identifier(s):
OSTI ID: 1438063
Report Number(s):
LA-UR-18-22535
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Reichhardt, Charles, and Reichhardt, Cynthia Jane. Clogging and depinning of ballistic active matter systems in disordered media. United States: N. p., 2018. Web. doi:10.1103/PhysRevE.97.052613.
Reichhardt, Charles, & Reichhardt, Cynthia Jane. Clogging and depinning of ballistic active matter systems in disordered media. United States. doi:10.1103/PhysRevE.97.052613.
Reichhardt, Charles, and Reichhardt, Cynthia Jane. Mon . "Clogging and depinning of ballistic active matter systems in disordered media". United States. doi:10.1103/PhysRevE.97.052613. https://www.osti.gov/servlets/purl/1483506.
@article{osti_1483506,
title = {Clogging and depinning of ballistic active matter systems in disordered media},
author = {Reichhardt, Charles and Reichhardt, Cynthia Jane},
abstractNote = {We numerically examine ballistic active disks driven through a random obstacle array. Formation of a pinned or clogged state occurs at much lower obstacle densities for the active disks than for passive disks. As a function of obstacle density, we identify several distinct phases including a depinned fluctuating cluster state, a pinned single-cluster or jammed state, a pinned multicluster state, a pinned gel state, and a pinned disordered state. At lower active disk densities, a drifting uniform liquid forms in the absence of obstacles, but when even a small number of obstacles are introduced, the disks organize into a pinned phase-separated cluster state in which clusters nucleate around the obstacles, similar to a wetting phenomenon. Here in this paper, we examine how the depinning threshold changes as a function of disk or obstacle density and find a crossover from a collectively pinned cluster state to a disordered plastic depinning transition as a function of increasing obstacle density. We compare this to the behavior of nonballistic active particles and show that as we vary the activity from completely passive to completely ballistic, a clogged phase-separated state appears in both the active and passive limits, while for intermediate activity, a readily flowing liquid state appears and there is an optimal activity level that maximizes the flux through the sample.},
doi = {10.1103/PhysRevE.97.052613},
journal = {Physical Review E},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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