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Effects of the number of particles and coordination number on viscous-flow agglomerate sintering

Particuology 2019年第2期17卷 76-83页

作者： mohammadmahdi kamyabi Khashayar Saleh Rahmat Sotudeh-Gharebagh Reza Zarghami Multiphase Systems Research Laboratory School of Chemical Engineering College of Engineering University of Tehran Tehran 11155/4563 Iran Sorbonne University/Compiegne University of Technology EA 4297 Transformations Integrees de la Matiere renouvelable France

The process of sinteri ng of several particles in con tact via a viscous flow mecha nism was studied numerically using computational fluid dynamics. The volume of fluid technique within a finite volume method was used to simulate bridge formation between particles, as well as densification at different configurational states of the particles. The method was validated by comparing results for two-particle coalescence with the *** effect of the numberof particles on agglomerati on kin etics was studied by comparing bridge growth rate for systems having different numbers of particles in a chain. Although increasing the number of particles led to a decrease in the local bridge growth rate and to slower equilibration, there were no marked differences, when the overall volume of the system was considered. The effect of coordination number on the densification rate was directly studied by changing the number of particles in contact with a central *** the coordination nurnbec caused the overall rate of densificatio n to in crease, but delayed equilibration, analogous to steric effects. These findi ngs describe the con figurational state of agglomerates, typical of mesoscale caking. In a multi-scale study, they can be used to characterize caking at a bulk scale to partly address the lack of experimental data in this field.

关键词： Caking Agglomeration Sintering Viscous flow mechanism Volume of fluid Coordination number

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