A new drag model for TFM simulation of gas–solid bubbling fluidized beds with Geldart-B particles--颗粒学报PARTICUOLOGY

Wang, Y., Zou, Z., Li, H., & Zhu, Q. (2014). A new drag model for TFM simulation of gas–solid bubbling fluidized beds with Geldart-B particles. Particuology, 15, 151–159. https://doi.org/10.1016/j.partic.2013.07.003

A new drag model for TFM simulation of gas–solid bubbling fluidized beds with Geldart-B particles

Yingce Wang ^{a b}, Zheng Zou ^{a b}, Hongzhong Li ^a *, Qingshan Zhu ^a

a State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b Graduate School of Chinese Academy of Science, Beijing 100049, China

10.1016/j.partic.2013.07.003

Volume 15, August 2014, Pages 151-159

Received 5 January 2013, Revised 24 April 2013, Accepted 10 July 2013, Available online 16 September 2013.

E-mail: hzli@home.ipe.ac.cn

Highlights

• A new drag model for Geldart-B particles TFM simulation in bubbling fluidized beds was proposed.

• The new model incorporated the contribution of meso-scale structure effects.

• Simulated results by the new model showed better agreement with experiments than Gidaspow model.

Abstract

In this work, a new drag model for TFM simulation in gas–solid bubbling fluidized beds was proposed, and a set of equations was derived to determine the meso-scale structural parameters to calculate the drag characteristics of Geldart-B particles under low gas velocities. In the new model, the meso-scale structure was characterized while accounting for the bubble and meso-scale structure effects on the drag coefficient. The Fluent software, incorporating the new drag model, was used to simulate the fluidization behavior. Experiments were performed in a Plexiglas cylindrical fluidized bed consisting of quartz sand as the solid phase and ambient air as the gas phase. Comparisons based on the solids hold-up inside the fluidized bed at different superficial gas velocities, were made between the 2D Cartesian simulations, and the experimental data, showing that the results of the new drag model reached much better agreement with experimental data than those of the Gidaspow drag model did.

Graphical abstract

Keywords

Fluidization; Bubbling fluidized bed; CFD; Geldart-B particles; Drag model

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