科研之友
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摘要
This paper concerns the use of the discrete element method (DEM) for the three-dimensional simulation of the consolidation of particle packings in a surrounding liquid such as those in paper-coating applications. The accuracy of DEM is first assessed using X-ray microtomography experiments in the case of polydisperse particle distributions. It is shown that simulations that only account for gravitational and contact forces are in excellent agreement with literature data. However, paper-coating applications involve more complex mechanisms governing the transient particle/pigment consolidation: compression effects during metering and calendering operations, and drag forces during the drainage of the liquid into the basesheet. To simulate the deposition of particles on the basesheet under drainage conditions more realistically, three modelling strategies are considered in this work, which respectively take into account: (1) gravity, (2) mechanical compression and (3) uniform drag. The results show that the first two strategies yield stratified structures and similar bulk porosities, and that the use of a uniform drag leads to significant changes in the particle dynamics and packing properties. Finally, exploratory results with a model for the two-way coupling between the dynamics of the liquid and solid phases reveal its potential for predicting the compression of wet granular media.
- 出版日期2011-3
