Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity--颗粒学报PARTICUOLOGY

Pei, P., Zhang, K., Xu, G., Yang, Y., & Wen, D. (2012). Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity. Particuology, 10(4), 444–449. https://doi.org/10.1016/j.partic.2012.03.002

Comparative analysis of CFD models for jetting fluidized beds: Effect of particle-phase viscosity

Pei Pei ^a, Kai Zhang ^b *, Gang Xu ^b, Yongping Yang ^b, Dongsheng Wen ^c

a Beijing Shenwu Environment & Energy Technology Corporation, Beijing 102200, China
b State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
c School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK

10.1016/j.partic.2012.03.002

Volume 10, Issue 4, August 2012, Pages 444-449

Received 10 March 2011, Accepted 19 January 2012, Available online 18 April 2012.

E-mail: kzhang@ncepu.edu.cn

Highlights

► The effect of particulate rheology on jetting dynamics in a fluidized bed is investigated.

► Different viscosity model are examined and compared with the experiments.

► Constant viscosity model with particle viscosity of 0.10–1.00 Pas is in agreement with the experiments.

► A simple two-fluid model with zero particle viscosity can predict jetting behaviors.

Abstract

Under the Eulerian–Eulerian framework of simulating gas–solid two-phase flow, the accuracy of the hydrodynamic prediction is strongly affected by the selection of rheology of the particulate phase, for which a detailed assessment is still absent. Using a jetting fluidized bed as an example, this work investigates the influence of solid rheology on the hydrodynamic behavior by employing different particle-phase viscosity models. Both constant particle-phase viscosity model (CVM) with different viscosity values and a simple two-fluid model without particle-phase viscosity (NVM) are incorporated into the classical two-fluid model and compared with the experimental measurements. Qualitative and quantitative results show that the jet penetration depth, jet frequency and averaged bed pressure drop are not a strong function of the particle-phase viscosity. Compared to CVM, the NVM exhibits better predictions on the jet behaviors, which is more suitable for investigating the hydrodynamics of gas–solid fluidized bed with a central jet.

Graphical abstract

Keywords

Jetting fluidized bed; Hydrodynamics; CFD; Eulerian–Eulerian model; Particle phase viscosity

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