Work

Restitution coefficient dependence of the pressure of a macroscopic active particle

Year: 2025

Type: article

Abstract: Active matter systems serve as a paradigm for diverse nonequilibrium phenomena. Macroscopic realizations of active particles may exhibit inelastic collisions. We study the restitution coefficient dependence of the pressure exerted by a single bristlebot, a type of macroscopic driven particle with hopping dynamics. The finite hopping time allows for low- and high-drag parameter regimes. For low drag, the bristlebot pushes the wall with a momentum transfer rate I ̇ that satisfies I ̇ ≃ F , where F is the active force, in agreement with results for soft (elastic) walls. In the high-drag regime, we find I ̇ ∝ ( 1 + r ) F , showing dependence on the coefficient of restitution r . This behavior can be understood analytically by studying the periodic solutions of a simple one-dimensional model. Numerical simulations show that the transition between two regimes also exists for highly active two-dimensional particles.

Source: Physical Review Research

DOI: 10.1103/qgcg-8cxf

Authors: Neta Ben Ari, Saar Rahav

Institution: Technion – Israel Institute of Technology

Language: English

Topic: Micro and Nano Robotics

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funder: Israel Science Foundation