Pressure dynamics in the bottleneck flow of self-propelled particles

Abstract

We present an experimental investigation of the pressure dynamics during the flow of self-propelled particles through narrow passages. When the ensemble is flowing, pressure fluctuates around a constant value that does not depend on the crowd size, suggesting that the orifice locally determines the dynamics in this scenario. On the contrary, when the system clogs, pressures are higher for larger crowd sizes, highlighting the importance of the whole collectivity in the process. Then, by correlating the pressure evolution with the exit time of the self-propelled particles, we discover that when a clog is resolved, pressure suddenly drops as a consequence of system reorganization. After this dramatic event, there is a sustained pressure growth over time that shows a square root dependence, compatible with the structural aging that has been proposed to be behind the broad tail distributions of clogging times.

References in corpus (14)

• Power-law distributions in empirical data
• Powerlaw: a Python package for analysis of heavy-tailed distributions
• Jamming during the discharge of granular matter from a silo
• Dynamics of a self-propelled particle in a harmonic trap
• Analytical Approach to Continuous and Intermittent Bottleneck Flows
• Fraction of clogging configurations sampled by granular hopper flow
• Unjamming a granular hopper by vibration
• Large Force Fluctuations in a Flowing Granular Medium
• Self-Aligning Polar Active Matter
• Critical Bottleneck Size for Jamless Particle Flows in Two Dimensions
• A Trap Model for Clogging and Unclogging in Granular Hopper Flows
• Role of liquid driving on the clogging of constricted particle suspensions
• Ergodicity breaking dynamics of arch collapse
• Fish evacuate smoothly respecting a social bubble