Static granular packings play a central role in numerous industrial applications and natural settings. In these situations, fluid or fine particle flow through a bed of static particles is heavily influenced by the narrowest passage connecting the pores of the packing, commonly referred to as pore throats, or constrictions. Existing studies predominantly assume monodisperse rigid particles, but this is an oversimplification of the problem. In this work, we illustrate the connection between pore throat size, polydispersity, and particle deformation in a packed bed of spherical particles. Simple analytical expressions are provided to link these properties of the packing, followed by examples from Discrete Element Method (DEM) simulations of fine particle percolation demonstrating the impact of polydispersity and particle deformation. Our intent is to emphasize the substantial impact of polydispersity and particle deformation on constriction size, underscoring the importance of accounting for these effects in particle transport in granular packings.

中文翻译：

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填充床多分散性和变形对细颗粒传输的影响


静态颗粒填料在众多工业应用和自然环境中发挥着核心作用。在这些情况下，流过静态颗粒床的流体或细颗粒流受到连接填料孔隙的最窄通道（通常称为孔喉或收缩）的严重影响。现有研究主要假设单分散刚性颗粒，但这过于简单化了问题。在这项工作中，我们阐述了球形颗粒填充床中孔喉尺寸、多分散性和颗粒变形之间的联系。提供了简单的解析表达式来链接填料的这些特性，随后是细颗粒渗透的离散元法 (DEM) 模拟示例，展示了多分散性和颗粒变形的影响。我们的目的是强调多分散性和颗粒变形对收缩尺寸的重大影响，强调考虑颗粒填料中颗粒传输的这些影响的重要性。