CFD–DEM simulation of fine particles in a spouted bed apparatus with a Wurster tube--颗粒学报PARTICUOLOGY

Breuninger, P., Weis, D., Behrendt, I., Grohn, P., Krull, F., & Antonyuk, S. (2019). CFD–DEM simulation of fine particles in a spouted bed apparatus with a Wurster tube. Particuology, 42, 114-125. https://doi.org/10.1016/j.partic.2018.03.015

CFD–DEM simulation of fine particles in a spouted bed apparatus with a Wurster tube

Paul Breuninger ^*, Dominik Weis, Isabell Behrendt, Philipp Grohn, Fabian Krull, Sergiy Antonyuk

Institute of Particle Process Engineering, University of Kaiserslautern, Gottlieb Daimler Str., Kaiserslautern, Germany

10.1016/j.partic.2018.03.015

Volume 42, February 2019, Pages 114-125

Received 19 December 2017, Revised 19 March 2018, Accepted 25 March 2018, Available online 27 September 2018, Version of Record 21 January 2019.

E-mail: paul.breuninger@mv.uni-kl.de

Highlights

• Fine particle dynamics were simulated in a spouted bed with a Wurster tube using CFD–DEM approach.

• Effect of particle surface energy on particle dynamics was studied in a range of 0–0.02 J/m².

• Experiments using high-speed camera showed a good agreement to simulated spout shape and height.

• Local particle concentration, velocity and collision number in the spouted bed were analyzed.

• Particles with surface energy of 0.02 J/m² showed smaller axial velocity and higher spout height.

Abstract

In this work, a coupled computational fluid dynamics–discrete element method (CFD–DEM) approach was employed to evaluate the spouting behavior of fine, cohesive powders in a cylindrical spouted bed with a conical base and equipped with a Wurster tube. The particle and gas dynamics inside the apparatus were simulated with 1.7 million spherical ZrO₂ particles with a particle size of 100 μm. For an accurate prediction of the interactions of cohesive particles in the spouted bed, the adhesion forces according to JKR theory were included in the Hertz–Tsuji contact model. The surface energy of the particles was varied over a wide range to determine the effect of the adhesion on the spouting (the fountain shape and maximum height as well as the distribution of the concentrations and velocities of particles in different zones of the apparatus). A detailed analysis of the collision dynamics was conducted. The spouting behavior of a spouted bed with the same dimensions, particles, and processing parameters was recorded with a high-speed camera. The CFD–DEM simulations showed good agreement with the experimentally captured spouting behavior.

Graphical abstract

Keywords

CFD–DEM; Spouted bed; Wurster tube; Cohesive powder

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