论文标题
从堵塞到连续流的过渡粒子悬浮液中的连续流动
Transition from clogging to continuous flow in constricted particle suspensions
论文作者
论文摘要
当悬浮的颗粒通过液体流穿过狭窄的通道推动时，他们可能会通过瓶颈穿过瓶颈，或者遇到永久阻止它们的永久堵塞。但是，它们也可能间歇性地流动，对颈部对粒子大小比D/d的敏感性很高。在这项工作中，我们通过实验探索通过单个瓶颈密集悬浮液的间歇性制度的限制，这是该参数的函数。为此，我们利用高时间和空间分辨率实验来获得连续爆发之间的逮捕时间t的分布，这些突发显示具有特征指数的幂律尾巴。这些指数与发现的不同情况相比，就像从房间疏散行人一样，将一群绵羊群进入棚子或从筒仓中排出的颗粒。然而，我们系统的固有特性，即通道几何形状，驱动和相互作用力，粒度分布似乎引入了从堵塞状态到连续流的急剧过渡，堵塞根本不会发展。这与在其他系统中获得的结果形成对比，在其他系统中获得的间歇性流量（幂律指数高于两个）的结果形成对比。
When suspended particles are pushed by liquid flow through a constricted channel they might either pass the bottleneck without trouble or encounter a permanent clog that will stop them forever. However, they may also flow intermittently with great sensitivity to the neck-to-particle size ratio D/d. In this work, we experimentally explore the limits of the intermittent regime for a dense suspension through a single bottleneck as a function of this parameter. To this end, we make use of high time- and space-resolution experiments to obtain the distributions of arrest times T between successive bursts, which display power-law tails with characteristic exponents. These exponents compare well with the ones found for as disparate situations as the evacuation of pedestrians from a room, the entry of a flock of sheep into a shed or the discharge of particles from a silo. Nevertheless, the intrinsic properties of our system i.e. channel geometry, driving and interaction forces, particle size distribution seem to introduce a sharp transition from a clogged state to a continuous flow, where clogs do not develop at all. This contrasts with the results obtained in other systems where intermittent flow, with power-law exponents above two, were obtained.
