Polysiloxane coatings on microspheres based on Multiphase Flow with Interface Exchange-Discrete Element Modelling--颗粒学报PARTICUOLOGY

Singh, S. K. D., Dietiker, J.-F., & Lu, K. (2022). Polysiloxane coatings on microspheres based on Multiphase Flow with Interface Exchange-Discrete Element Modelling. Particuology, 69, 88-99. https://doi.org/10.1016/j.partic.2021.12.003

Polysiloxane coatings on microspheres based on Multiphase Flow with Interface Exchange-Discrete Element Modelling

Sanjay Kumar Devendhar Singh ^a, Jean-François Dietiker ^{b c}, Kathy Lu ^a *

a Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
b National Energy Technology Laboratory, Pittsburgh, PA 15236, USA
c Leidos Research Support Team, Pittsburgh, PA 15236-0940, USA

10.1016/j.partic.2021.12.003

Volume 69, October 2022, Pages 88-99

Received 20 June 2021, Revised 20 November 2021, Accepted 2 December 2021, Available online 16 December 2021, Version of Record 6 January 2022.

E-mail: klu@vt.edu

Highlights

• Polysiloxane coatings on zirconia microspheres were simulated using MFiX-DEM.

• Two different coater setups, with and without the Wurster tube, were studied.

• Wurster tube reduces particle clustering during coating.

• Lower Wurster tube position and higher gas inlet pressure are desired.

• Particles retained in the spout fluidized bed coater are >97% during coating.

Abstract

Polysiloxane coatings on yttria stabilized zirconia (YSZ) microspheres of 500 μm were simulated in a spout fluidized bed coater using Multiphase Flow with Interface Exchange-Discrete Element Modelling (MFiX-DEM). Two different coater configurations were developed to study the influence of gas velocity and its distribution on particle dynamics. The presence of the Wurster tube not only enhances the distribution but also increases the overall residence time of the particles. Investigations were also carried out with different Wurster tube positions (normal, 10% and 20% lowered from its initial position). Among these, 20% lowered Wurster tube position demonstrated the most effective coating process. The effects of gas inlet pressure on the average gas velocity and the distribution of particles were analyzed. More than 97% of the particles can be retained. The derived results, including average gas velocity, particle retention percentage, and distribution of particles with gas velocity, are being used to guide the experimental work in obtaining defect-free coatings for YSZ microspheres.

Graphical abstract

Keywords

Spouted bed; Wurster tube; Coating; Yttria stabilized zirconia (YSZ); MFiX

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