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Effective wall slip in chutes and channels: experiments and discrete element simulations

机译：溜槽和通道中的有效壁滑：实验和离散元素模拟

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摘要

Wall slip is an important phenomenon for the flow of granular materials in chutes and channels. The appearance of a slip velocity at the wall critically affects wall stresses and flow profiles, and particularly the total flowrate. In this work we show, through numerical simulations and experiments, that the global slip phenomenon at a wall has peculiar features which deviate significantly from simple sliding behavior. At first we present experimental data for the vertical chute flow which highlight that wall slip depends on many operating and system variables such as flow rate, material properties, wall properties. Secondly, we resume a large campaign of numerical data performed in 2D with polygonal particles, and try to analyse the effect of material properties, contact parameters, operating variables, different flow configurations, on the slip phenomenon. The numerical campaign allowed to identify the main parameters affecting the wall slip behavior of a numerical model of granular flow, providing the ingredients for the creation of a framework for the description of wall slip.
机译：壁滑是滑槽和通道中颗粒状物料流动的重要现象。壁面滑动速度的出现严重影响壁面应力和流动曲线，特别是总流量。在这项工作中，我们通过数值模拟和实验表明，墙体的整体滑移现象具有独特的特征，这些特征明显不同于简单的滑动行为。首先，我们提供了垂直滑道流量的实验数据，这些数据突显了壁滑取决于许多操作和系统变量，例如流量，材料特性，壁特性。其次，我们继续对多边形粒子在2D模式下进行的大量数值数据研究，并尝试分析材料特性，接触参数，操作变量，不同流动配置对滑移现象的影响。数值运动可以识别影响颗粒流数值模型壁滑行为的主要参数，为创建壁滑描述框架提供了要素。

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