Abstract

Size segregation will lead to stratification of a particle system. At present, people have not fully understood the segregation mechanism. In this work, we have studied the size segregation behavior of two-component disk particles in chute flows. The effects of particle size ratio η, particle density ρ, static friction coefficient μ and chute angle α on size segregation are discussed. We use the discrete element method to simulate and calculate the force of disk large particles during segregation. Results show that the ‘squeeze expulsion’ mechanism plays a key role in the size segregation of a disk particle flow. We establish a physical model of ‘squeeze expulsion’ of disk particles and obtain the conditions for the formation of ‘squeeze expulsion’ mechanism.

Graphic abstract

中文翻译：

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二维溜槽中圆盘颗粒的尺寸分离

摘要

尺寸分离将导致粒子系统的分层。目前，人们还没有完全理解隔离机制。在这项工作中，我们研究了溜槽流中双组分圆盘颗粒的尺寸偏析行为。粒度比η、颗粒密度ρ、静摩擦系数μ和溜槽角α的影响对尺寸隔离进行了讨论。我们使用离散元方法来模拟和计算盘状大颗粒在分离过程中的受力。结果表明，“挤压排出”机制在圆盘颗粒流的尺寸分离中起着关键作用。我们建立了圆盘粒子“挤压排”的物理模型，得到了“挤压排”机制形成的条件。

图形摘要