A new capillary force model implemented in micro-scale CFD-DEM coupling for wet granulation

作者：Washino K; Tan H S; Hounslow M J; Salman A D^*

来源：Chemical Engineering Science, 2013, 93: 197-205.

DOI：10.1016/j.ces.2013.02.006

• DEM
• CFD
• Constrained Interpolation Profile (CIP)
• method
• Capillary force model
• Droplet penetration
• Wet granulation

A DNS (Direct Numerical Simulation) model for solid, liquid, and gas three-phase flow, mainly targeting to simulate the nucleation processes in wet granulation, is presented in this paper. A liquid-gas two-phase flow is solved by using the CIP (Constrained Interpolation Profile) method, which is one of the CFD multi-phase solvers, and a solid particle flow is solved by DEM (Discrete Element Method) separately. The interaction between fluid (liquid and gas) and solid phases is taken into account by coupling CFD and DEM. A new model is developed to account for the capillary force exerted on particles, i.e. the surface tension force which pulls a particle along with the solid-liquid-gas contact line, and the accuracy of the model is examined. Although the main focus in this study is to develop a CFD-DEM coupling and the capillary force models for wet granulation, some simulation results are also presented to see the droplet behaviour often encountered in a wet granulation process, i.e. the droplet penetration into a static particle bed as well as the droplet impingement onto a dynamic particle bed. The simulation results are compared with the experimental results in the literature and it shows a good agreement in terms of tendency.

• 出版日期2013-4-19