Discrete particle simulation of particle–fluid flow: model formulations and their applicability

The approach of combining computational fluid dynamics (CFD) for continuum fluid and the discrete element method (DEM) for discrete particles has been increasingly used to study the fundamentals of coupled particle–fluid flows. Different CFD–DEM models have been used. However, the origin and the app...

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Veröffentlicht in:	Journal of fluid mechanics Jg. 661; S. 482 - 510
Hauptverfasser:	ZHOU, Z. Y., KUANG, S. B., CHU, K. W., YU, A. B.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Cambridge, UK Cambridge University Press 25.10.2010
Schlagworte:	Applied sciences Centrifugation, cyclones Chemical engineering Computational fluid dynamics Computational methods in fluid dynamics Computer simulation Continuums Discrete element method Drives Exact sciences and technology Flow system Flow velocity Fluid dynamics Fluid flow Fluid mechanics Fluidization fluidized beds Fluids Fundamental areas of phenomenology (including applications) granular media Hydrodynamics Liquid-liquid and fluid-solid mechanical separations Mathematical models Mechanical engineering. Machine design Origins particle–fluid flows Physics Pneumatic conveyors Speed variators, torque converters. Hydraulic drives and controls, pneumatic drives and controls, fluids and components, hydraulic motors, pneumatic motors particle–fluid flows fluidized beds granular media Hydrocyclone Computational fluid dynamics Granular material Numerical simulation Pneumatic conveyance Fluidization Discrete element method Modeling Fluidized bed
ISSN:	0022-1120, 1469-7645
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Zusammenfassung:	The approach of combining computational fluid dynamics (CFD) for continuum fluid and the discrete element method (DEM) for discrete particles has been increasingly used to study the fundamentals of coupled particle–fluid flows. Different CFD–DEM models have been used. However, the origin and the applicability of these models are not clearly understood. In this paper, the origin of different model formulations is discussed first. It shows that, in connection with the continuum approach, three sets of formulations exist in the CFD–DEM approach: an original format set I, and subsequent derivations of set II and set III, respectively, corresponding to the so-called model A and model B in the literature. A comparison and the applicability of the three models are assessed theoretically and then verified from the study of three representative particle–fluid flow systems: fluidization, pneumatic conveying and hydrocyclones. It is demonstrated that sets I and II are essentially the same, with small differences resulting from different mathematical or numerical treatments of a few terms in the original equation. Set III is however a simplified version of set I. The testing cases show that all the three models are applicable to gas fluidization and, to a large extent, pneumatic conveying. However, the application of set III is conditional, as demonstrated in the case of hydrocyclones. Strictly speaking, set III is only valid when fluid flow is steady and uniform. Set II and, in particular, set I, which is somehow forgotten in the literature, are recommended for the future CFD–DEM modelling of complex particle–fluid flow.
Bibliographie:	istex:5102D922AADAA1CD7A158CB45410CD7CA081088E PII:S002211201000306X ArticleID:00306 ark:/67375/6GQ-DWTKBT31-N SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0022-1120 1469-7645
DOI:	10.1017/S002211201000306X