Effect of operational and geometric parameters on the hydrodynamics of a Wurster coater: A CFD-DEM study--颗粒学报PARTICUOLOGY

Song, Y., Zhou, T., Bai, R., Zhang, M., & Yang, H. (2024). Effect of operational and geometric parameters on the hydrodynamics of a Wurster coater: A CFD-DEM study. Particuology, 85, 62-76. https://doi.org/10.1016/j.partic.2023.03.019

Effect of operational and geometric parameters on the hydrodynamics of a Wurster coater: A CFD-DEM study

Yinqiang Song ^{a b}, Tuo Zhou ^{a b}, Ruiqi Bai ^{a b}, Man Zhang ^{a b}, Hairui Yang ^{a c *}

a Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China
b Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, China
c State Key Laboratory of Power System and Generation Equipment, Tsinghua University, Beijing, 100084, China

10.1016/j.partic.2023.03.019

Volume 85, February 2024, Pages 62-76

Received 7 October 2022, Revised 12 March 2023, Accepted 23 March 2023, Available online 9 April 2023, Version of Record 20 April 2023.

E-mail: yhr@mail.tsinghua.edu.cn

Highlights

• A coupled CFD-DEM method was employed and the CFD part was validated.

• The effect of gas velocity, gap height, tube length and batch volume was studied.

• The de-fluidization problem was identified and the solutions were provided.

• The shielding effect of coarse particles to fine particles was analyzed.

Abstract

A coupled CFD-DEM method was used to study the hydrodynamics of a Wurster coater. Firstly, the CFD part of the model was validated by the accurate prediction of the pressure drops over a pseudo-2D fluidized bed under various gas velocities. The effect of gas velocity, gap height, tube length and batch volume of the particles on the cycle time and the residence time of the particles was thoroughly investigated. The central jet gas velocity u1 was found to speed up the particle cycle but undermine the coating efficiency. The gas velocity at the horizontal transport zone u₂ was able to promote the horizontal transport of the particles but should not be too high, otherwise, it would obstruct the normal falling back of the particles in the downward zone. Big gap heights would decrease the coating efficiency but tube length had little impact on that. The increment of batch volume would commonly abase the cycle time and the working efficiency under a given u₁. The de-fluidization problem arose when the batch volume increased to 550 mL. However, this problem could be swept out by the optimization of u₁ and u₂. In a mixture of different sizes, the coarse particles enjoyed higher coating efficiency and could travel closer to the nozzles. This may shield the fine particles from getting enough coating liquids, and thus coarse particles and fine particles were not recommended to get coated in the same batch.

Graphical abstract

Keywords

Numerical simulation; CFD-DEM; Wurster coater; Hydrodynamics; Cycle time; Residence time

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