...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Minerals Engineering >An analysis of multiphase flow and solids separation inside Knelson Concentrator based on four-way coupling of CFD and DEM simulation methods
【24h】

An analysis of multiphase flow and solids separation inside Knelson Concentrator based on four-way coupling of CFD and DEM simulation methods

机译：基于CFD和DEM模拟方法的四路耦合，瓣盘浓缩器内部多相流动分离分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Knelson Concentrator (KC) has been widely used in industrial gravity separation processes. In the present study, the separation process for a multiphase flow in a laboratory Knelson Concentrator (LKC) is numerically simulated using a 4-way coupled CFD-DEM approach. The simulation of the complex multiphase flow is carried out by using a hybrid Eulerian–Lagrangian model, dense discrete phase model (DDPM), as well as DEM collision model to include the solid inter-particle collisions and to compute individual particles trajectories. The particle–fluid interaction is considered by exchanging momentum through the interaction forces such as drag force, virtual mass force and pressure gradient force between the DEM and the CFD computations. The Realizable Mixture k-ε turbulence model is selected to model the turbulence of fluid phase due to its swirling nature. Since coupled simulations are computationally expensive and challenging, the separation process inside the laboratory KC bowl was simulated for a real process time of 20?s under the specific conditions. Coupled CFD-DEM simulation yields valuable information about both particle and fluid flow patterns such as residence time distribution and velocity magnitude of particles inside the rings which are difficult or even impossible to measure experimentally with sufficient accuracy; meanwhile, the simulation results are expressed in terms of performance indices, i.e., concentrate grade and total recovery. To validate the simulation predictions, the authors carried out an experimental test under the same operating conditions used in the simulation. A complete agreement between simulation predictions and laboratory measurements for concentrate grade and total recovery was observed both qualitatively and quantitatively which validates coupled CFD-DEM simulation.
机译：瓣架集中器（KC）已广泛用于工业重力分离过程。在本研究中，使用4路耦合的CFD-DEM方法进行数值模拟实验室瓣架集中器（LKC）中的多相流的分离过程。通过使用混合欧拉拉格朗日模型，密集的离散相位模型（DDPM）以及DEM碰撞模型来进行复杂多相流的模拟，包括固体颗粒碰撞和计算各个粒子轨迹。通过在DEM和CFD计算之间的拖曳力，虚拟质量力和压力梯度力之类的相互作用，通过交换势力来考虑颗粒流体相互作用。选择可实现的混合物K-ε湍流模型以模拟流体相的湍流由于其旋流性质。由于耦合模拟是计算昂贵且具有挑战性的，因此在特定条件下模拟了实验室KC碗内的分离过程。耦合CFD-DEM模拟产生关于粒子和流体流动模式的有价值的信息，例如诸如难以甚至不可能以足够的准确度实验测量的环内颗粒的停留时间分布和颗粒的速度大小;同时，仿真结果以性能指数，即集中级和全部恢复表示。为了验证模拟预测，作者在模拟中使用的相同操作条件下进行了实验测试。定性和定量地观察到浓缩级和总恢复的模拟预测和实验室测量之间的完全同意，验证了CFD-DEM模拟。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号