Considering solid shear stress in MP-PIC simulation of a CFB riser--颗粒学报PARTICUOLOGY

Kadyrov, T., Li, F., & Ullah, A. (2024). Considering solid shear stress in MP-PIC simulation of a CFB riser. Particuology, 89, 79-87. https://doi.org/10.1016/j.partic.2023.10.013

Considering solid shear stress in MP-PIC simulation of a CFB riser

Tagir Kadyrov ^{a b}, Fei Li ^c *, Atta Ullah ^d

a Nature-inspired Engineering Center, University of Tyumen, Tyumen 625003, Russia
b Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen, 625003, Russia
c State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
d Department of Chemical Engineering, Pakistan Institute of Engineering & Applied Sciences, Islamabad 45650, Pakistan

10.1016/j.partic.2023.10.013

Volume 89, June 2024, Pages 79-87

Received 20 June 2023, Revised 2 October 2023, Accepted 26 October 2023, Available online 7 November 2023, Version of Record 6 December 2023.

E-mail: lifei@ipe.ac.cn

Highlights

• Solid shear stress model was implemented in MP-PIC method.

• Circulating fluidized bed was simulated by combining MP-PIC method with an EMMS drag force model.

• Cases including only normal solid stress and those considering both normal and shear solid stresses were compared.

• Effect of the number of particles per parcel was analyzed.

Abstract

To enable successful multi-phase particle-in-cell (MP-PIC) simulations of circulating fluidized beds (CFBs), both the interphase drag force and interparticle collisions need to be carefully modeled. Particle collisions are usually represented by the solid stress consisting of the normal and shear components, in which the normal stress was found to have a leading role in the numerical stability of MP-PIC simulations, whereas the impact of the shear stress has seldom been reported. In this work, the effects of the solid shear stress are investigated by using two-dimensional simulations of the moderately dense laboratory-scale CFB riser with in-house MP-PIC code implemented on MFIX open-source platform. Cases including only normal solid stress and those considering both normal and shear solid stresses are simulated. The results of solids flux, axial and radial solids profiles are compared with available experimental data. The results show that the solid shear stress plays a minor role on the accuracy of simulation, and the increase of PPP (number particles per parcel) leads to a lower accuracy of simulation.

Graphical abstract

Keywords

Simulation; Fluidization; Multiphase particle-in-cell (MP-PIC); Solid shear stress

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