Bubble dynamics in a two-dimensional gas–solid fluidized bed--颗粒学报PARTICUOLOGY

Hong, R., Ren, Z., Ding, J., Kawaji, M., & Li, H. (2007). Bubble dynamics in a two-dimensional gas–solid fluidized bed. China Particuology, 5(4), 284–294. https://doi.org/10.1016/j.cpart.2007.04.002

Bubble dynamics in a two-dimensional gas–solid fluidized bed

Ruoyu Hong ^a *, Zhiqiang Ren ^a, Jianmin Ding ^c, M. Kawaji ^d, Hongzhong Li ^b

a Chemical Engineering Department & Key Laboratory of Organic Synthesis, Soochow University, Dushuh, SIP, Suzhou 215123, China
b Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
c IBM, HYDA/050-3 C202, 3605 Highway 52 North, Rochester, MN 55901, USA
d Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ont. M5S 3E5, Canada

10.1016/j.cpart.2007.04.002

Volume 5, Issue 4, August 2007, Pages 284-294

Received 15 February 2006, Accepted 4 April 2007, Available online 3 July 2007.

E-mail: rhong@suda.edu.cn

Highlights

Abstract

Related referential studies on gas–solid two-phase flows were briefly reviewed. Bubble ascending in a two-dimensional (2D) gas–solid fluidized bed was studied both experimentally and numerically. A modified continuum model expressed in the conservation form was used in numerical simulation. Solid-phase pressure was modeled via local sound speed; gas-phase turbulence was described by the K–ɛ two-equation model. The modified implicit multiphase formulation (IMF) scheme was used to solve the model equations in 2D Cartesian/cylindrical coordinates. The bubble ascending velocity and particle motion in the 2D fluidized bed were measured using the photochromic dye activation (PDA) technique, which was based on UV light activation of particles impregnated with the dye. Effects of bed height and superficial gas velocity on bubble formation and ascent were investigated numerically. The numerically obtained bubble ascending velocities were compared with experimental measurements. Gas bubble in jetting gas–solids fluidized bed was also simulated numerically.

Graphical abstract

Keywords

Fluidization; Numerical simulation; Flow visualization; Bubble dynamics

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