Volume 62, Issue 7 p. 2259-2270
Particle Technology and Fluidization

An adhesive CFD-DEM model for simulating nanoparticle agglomerate fluidization

Daoyin Liu

Daoyin Liu

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China

Dept. of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

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Berend G. M. van Wachem

Berend G. M. van Wachem

Thermofluids Div., Dept. of Mechanical Engineering, Imperial College London, London, U.K.

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Robert F. Mudde

Robert F. Mudde

Dept. of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

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Xiaoping Chen

Xiaoping Chen

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China

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J. Ruud van Ommen

Corresponding Author

J. Ruud van Ommen

Dept. of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

Correspondence concerning this article should be addressed to J. R. van Ommen at [email protected].Search for more papers by this author
First published: 02 March 2016
Citations: 43

Abstract

Nanoparticles are fluidized as agglomerates with hierarchical fractal structures. In this study, we model nanoparticle fluidization by assuming the simple agglomerates as the discrete element in an adhesive (Computational Fluid Dynamics—Discrete Element Modelling) CFD-DEM model. The simple agglomerates, which are the building blocks of the larger complex agglomerates, are represented by cohesive and plastic particles. It is shown that both the particle contact model and drag force interaction in the conventional CFD-DEM model need modification for properly simulating a fluidized bed of nanoparticle agglomerates. The model is tested for different cases, including the normal impact, angle of repose (AOR), and fluidization of nanoparticle agglomerates, represented by the particles with the equivalent material properties. It shows that increasing the particle adhesion increases the critical stick velocity, angle of repose, and leads from uniform fluidization to defluidization. The particle adhesion, bulk properties, and fluidization can be linked to each other by the current adhesive CFD-DEM model. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2259–2270, 2016