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Related Experiment Video

Updated: Nov 21, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

Active Brownian particles moving through disordered landscapes.

Kristian S Olsen¹, Luiza Angheluta¹, Eirik G Flekkøy¹

¹PoreLab, Department of Physics, University of Oslo, Blindern, 0316 Oslo, Norway. k.s.olsen@fys.uio.no.

|January 14, 2021

Summary

This summary is machine-generated.

Active Brownian particles with internal energy depots exhibit normal or anomalous dispersion in disordered media, depending on drag conditions. In strong disorder, self-propulsion speed effectively fluctuates, impacting particle dynamics.

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Area of Science:

Statistical Physics
Soft Matter Physics
Complex Systems

Background:

Disordered media are common in biological and synthetic active matter systems.
Understanding particle dynamics in such environments is crucial for various applications, including microfluidics.

Purpose of the Study:

To investigate the behavior of active Brownian particles with internal energy depots in quenched frictional disorder.
To analyze the impact of fast internal relaxation and strong disorder on particle displacement and speed.

Main Methods:

Analytical calculations of mean-square displacement under fast-relaxation approximation.
Numerical integration of energy depot dynamics.
Analysis of particle behavior in the strongly disordered limit.

Main Results:

Analytical predictions for mean-square displacement show good agreement with numerical simulations.
Normal dispersion observed for bounded drag coefficients; anomalous dispersion for power-law drag dependencies.
Self-propulsion speed behaves as a fluctuating quantity in strongly disordered media.

Conclusions:

The study provides a theoretical framework for active Brownian particle dynamics in disordered media.
Drag coefficient characteristics significantly influence particle dispersion patterns.
The concept of fluctuating self-propulsion speed is validated in the strong disorder regime.