2021/11/30 by Dan Liu, Gerhard Müller · 4 citations
Engineering · Materials Science · Physics and Astronomy · #Ansatz #Channel (broadcasting) #Dimensionless quantity #Jamming #Micro and Nano Robotics #Microfluidic and Bio-sensing Technologies #Nonlocal and gradient elasticity in micro/nano structures #Path (computing) #Plane (geometry) #Range (aeronautics) #Sequence (biology) #Work (physics) #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.105.024904
published in Physical review. E 105(2), 024904 (American Physical Society) · 13 pages, 15 figures, 8 tables
openalex created_date 2021/12/06 · arxiv created 2022/02/28 · openalex publication_date 2022/02/28 · arxiv updated 2022/03/02 · openalex updated_date 2026/08/05
Disks of two sizes and weights in alternating sequence are confined to a long and narrow channel. The axis of the channel is horizontal and its plane vertical. The channel is closed off by pistons that freeze jammed microstates out of loose disk configurations subject to moderate pressure, gravity, and random agitations. Disk sizes and channel width are such that under jamming no disk remains loose and all disks touch one wall. We present exact results for the characterization of jammed macrostates including volume and entropy. The rigorous analysis divides the disk sequences of jammed microstates into overlapping tiles from which we construct a small number of species of statistically interacting particles. Jammed macrostates depend on dimensionless control parameters inferred from ratios between measures of expansion work against the pistons, gravitational potential energy, and intensity of random agitations. These control parameters enter the configurational statistics via the activation energies prior to jamming of the particles. The range of disk weights naturally divides into regimes where qualitatively different features come into play. We sketch a path toward generalizations that include random sequences under a modified jamming protocol.