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Modelisation numerique d'ecoulements de particules cohesives par la methode des elements discrets.

机译：内聚粒子流的离散元法数值模拟。

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摘要

Granular flows are present in various types of industrial applications and exhibit complex behaviors that are complex and difficult to analyze. In the context of the work carried out at the Research Unit on Industrial Flows (URPEI), it was discovered with some experiments in a rotating mixer that it is possible to control the cohesive force between particles by coating the latter with a certain type of polymer. Indeed, it was found that the cohesive force can be increased either by increasing the thickness of the polymer, or by increasing the temperature of the particle bed. In addition, one of the ways to study granular flows is to perform computer simulations using the discrete element method (DEM). However, the computer code based on the DEM and available at URPEI did not include the possibility to add cohesive forces between particles.;The main objective of this project was the numerical modeling of cohesive granular flows. To perform this task, appropriate cohesive models were selected for the normal direction of the contact, as well as for the tangential direction. The JKR model was used for the normal direction, and the Thornton model for the tangential direction. Both models were introduced in the computer code available at URPEI and developed in Fortran 90. To ensure the proper functioning of the program, eleven verification tests were performed. These tests, containing one, two or five particles have ensured the validity of the results obtained for impacts in the normal direction of the contact. In addition, in order to simulate cohesive granular flows and to validate the results, static repose angle tests were conducted as well as cohesive flows in a rotating mixer. First, it was shown that an increase of the cohesive force between particles increases the repose angle, which is in agreement with the literature. Also, for the simulations in the rotating mixer, it was shown that increasing the cohesive force between the particles allows the expansion of the particle bed due to the increase of porosity.
机译：颗粒流存在于各种类型的工业应用中，并且表现出复杂且难以分析的复杂行为。在工业流研究部门（URPEI）进行的工作中，通过在旋转混合器中进行的一些实验发现，可以通过在颗粒上涂覆某种类型的聚合物来控制颗粒之间的内聚力。 。实际上，已发现可以通过增加聚合物的厚度或通过增加颗粒床的温度来增加内聚力。此外，研究粒状流的方法之一是使用离散元素方法（DEM）进行计算机模拟。但是，基于DEM的计算机代码（可在URPEI获得）并不包括在粒子之间添加内聚力的可能性。该项目的主要目的是对内聚颗粒流进行数值模拟。为了执行此任务，为接触的法线方向和切线方向选择了适当的内聚模型。法线方向使用JKR模型，切线方向使用Thornton模型。这两种模型都在URPEI可用的计算机代码中进行了介绍，并在Fortran 90中进行了开发。为了确保程序的正常运行，进行了11次验证测试。这些包含一个，两个或五个粒子的测试确保了所获得的沿法线接触方向的冲击结果的有效性。此外，为了模拟内聚颗粒流动并验证结果，在旋转混合器中进行了静态休止角测试以及内聚流动。首先，表明颗粒之间的内聚力的增加增加了休止角，这与文献一致。另外，对于在旋转混合器中的模拟，结果表明，由于孔隙率的增加，增加颗粒之间的内聚力允许颗粒床的膨胀。

著录项

  • 作者

    Cabana, Alexandre E.;

  • 作者单位

    Ecole Polytechnique, Montreal (Canada).;

  • 授予单位 Ecole Polytechnique, Montreal (Canada).;
  • 学科 Engineering Chemical.;Chemistry Polymer.;Computer Science.
  • 学位 M.Sc.A.
  • 年度 2013
  • 页码 124 p.
  • 总页数 124
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:40:53

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