Modelling of partially wet particles in DEM simulations of a solid mixing process
Modelling of partially wet particles in DEM simulations of a solid mixing process
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固体混合过程 DEM 模拟中部分湿颗粒的建模
DOI：
10.1016/j.powtec.2018.07.028
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发表时间：
2018
影响因子：
5.2
通讯作者：
H. Nirschl
中科院分区：
文献类型：
--
作者：
S. Schmelzle;E. Asylbekov;B. Radel;H. Nirschl
固体混合过程的基本目标是避免任何偏析效应。尤其是自由流动的散体固体，颗粒间粘附力较弱，容易发生渗流偏析。液体添加是混合造粒过程中常见的现象，由于摆动的液桥网络，通常会减少颗粒的分离。然而，液体加入会导致偏析机制的改变。例如：当亲水性和疏水性固体需要混合时，水可能会选择性地积聚在一个组分中。主要由一种固体组分组成的异质团聚会产生并降低最终产品的质量。在这项工作中，离散元方法(DEM)被用来更详细地研究湿颗粒固体的混合和分离。在颗粒碰撞过程中，液体从一个接触伙伴转移到另一个接触伙伴，直到液体均匀地分布在主体中。现有的液桥模型假定颗粒完全润湿，或者忽略了混合组分的接触角可能不同。为了实现包括液滴在颗粒表面形成的部分颗粒润湿，我们进一步发展了液体接触分散模型。将部分颗粒润湿模型与普通膜模型进行了比较，结果表明，在DEM模拟中引入部分颗粒润湿模型后，实验验证效果有所改善。通过对混合效率和液体分布的评价，对这些模型进行了评价。
It is the basic objective of a solid mixing process to avoid any segregation effects. Especially free-flowing bulk solids with weak interparticle adhesive forces tend to percolating segregation. Liquid addition, which is common in mixing granulation processes, will usually reduce the particle segregation due to pendular liquid bridge networks. However, liquid addition can result in a change of the segregation mechanism. For example: water may accumulate selectively in one component when hydrophilic and hydrophobic solids need to be mixed. Heteroagglomerates that consist mainly of one solid component may arise and degrade the final product quality.In this work the Discrete Element Method (DEM) is applied to investigate mixing and segregation of moist particulate solids in more detail. During particle collision liquid is transferred from one to the other contact partner until the liquid is uniformly distributed in the bulk. The available liquid bridge models assume complete particle wetting or neglect that the mixing components may differ in their contact angle. We developed the liquid contact dispersion model further in order to realize partial particle wetting that includes drop formation on the particle surface. A comparison between the common film model and the proposed model shows an improvement in experimental validation when the partial particle wetting model is included in the DEM simulation. The assessment of these models is carried out by evaluating mixing efficiency and liquid distribution.
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