Péter H, Libál A, Reichhardt C, Reichhardt C J O
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
Faculty of Mathematics and Computer Science, Babeş-Bolyai University, Cluj, 400084, Romania.
Sci Rep. 2018 Jul 6;8(1):10252. doi: 10.1038/s41598-018-28256-6.
Jamming describes a transition from a flowing or liquid state to a solid or rigid state in a loose assembly of particles such as grains or bubbles. In contrast, clogging describes the ceasing of the flow of particulate matter through a bottleneck. It is not clear how to distinguish jamming from clogging, nor is it known whether they are distinct phenomena or fundamentally the same. We examine an assembly of disks moving through a random obstacle array and identify a transition from clogging to jamming behavior as the disk density increases. The clogging transition has characteristics of an absorbing phase transition, with the disks evolving into a heterogeneous phase-separated clogged state after a critical diverging transient time. In contrast, jamming is a rapid process in which the disks form a homogeneous motionless packing, with a rigidity length scale that diverges as the jamming density is approached.
阻塞描述了在诸如颗粒或气泡等松散颗粒集合中从流动或液态状态到固态或刚性状态的转变。相比之下，堵塞描述的是颗粒物质通过瓶颈的流动停止。目前尚不清楚如何区分阻塞和堵塞，也不清楚它们是不同的现象还是本质上相同。我们研究了通过随机障碍物阵列移动的圆盘集合，并确定随着圆盘密度的增加，存在从堵塞到阻塞行为的转变。堵塞转变具有吸收相变的特征，圆盘在临界发散瞬态时间后演变成异质相分离的堵塞状态。相比之下，阻塞是一个快速过程，其中圆盘形成均匀的静止堆积，随着接近阻塞密度，其刚性长度尺度会发散。
