Development of a filtered drag model considering effect of the solid shear rate (Open Access)--颗粒学报PARTICUOLOGY

Wang, L., Jiang, M., & Zhou, Q. (2022). Development of a filtered drag model considering effect of the solid shear rate. Particuology, 71, 63-74. https://doi.org/10.1016/j.partic.2022.01.015

Development of a filtered drag model considering effect of the solid shear rate (Open Access)

Lingxue Wang ^a^b, Ming Jiang^{a b}, Qiang Zhou ^{a b c *}

a School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, 710049, China
b Engineering Research Center of New Energy System Engineering and Equipment, University of Shaanxi Province, Xi’an, 710049, China
c State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

10.1016/j.partic.2022.01.015

Volume 71, December 2022, Pages 63-74

Received 10 October 2021, Revised 6 January 2022, Accepted 25 January 2022, Available online 3 February 2022, Version of Record 23 February 2022.

E-mail: zhou.590@mail.xjtu.edu.cn

Highlights

• Solid shear rate has a considerable impact on meso-scale structures.

• Influence of solid shear rate on drag force can be divided into three stages.

• A corrected method considering effect of solid shear rate is developed.

• Solid shear rate correction model can improve simulation results.

Abstract

This study investigates a 2D gas–solid fast fluidized bed of typical Geldart A particles using highly resolved simulations with two-fluid model. The results show that the solid shear rate has a considerable impact on the orientation of the meso-scale structures and hence on the filtered drag force. On the basis of the correlation for the filtered drag force established in the literature using the traditional markers (such as filtered solid volume fraction, filtered slip velocity and filter scale), a correction correlated with the solid shear rate in the direction of gravity is proposed for better prediction of the filtered drag force. The corrected model is shown to produce improved results in posterior tests of flows in different fluidization regimes including bubbling, turbulent and fast fluidization.

Graphical abstract

Keywords

Gas–solid flows; Fluidization; Two-fluid model; Dimensionless solid shear rate; Filtered drag force

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