Mass transfer between bubbles and the dense phase in gas fluidized beds--颗粒学报PARTICUOLOGY

Xie, H., & Sun, Z. (2014). Mass transfer between bubbles and the dense phase in gas fluidized beds. Particuology, 16, 213–217. https://doi.org/10.1016/j.partic.2014.03.016

Mass transfer between bubbles and the dense phase in gas fluidized beds

Hongyong Xie^*, Zhiguo Sun

School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, China

10.1016/j.partic.2014.03.016

Volume 16, October 2014, Pages 213-217

Received 14 December 2013, Revised 10 February 2014, Accepted 5 March 2014, Available online 12 July 2014.

E-mail: hyxie@163.com; hyxie@sspu.edu.cn

Highlights

• Mass transfer between injected single bubbles and dense phase in gas fluidized beds was studied.

• Dependence of mass transfer coefficient on projected bubble size could be expressed as k_be = 0.21d_b.

• Effective diffusion coefficient in gas fluidized beds could be correlated with d_bas D_e=13.3d_b^2.7.

• k_be could be given by in a 3D and in a 2D fluidized bed of Group A and B particles.

Abstract

Mass transfer between a bubble and the dense phase in gas fluidized beds of Group A and Group B particles was proposed based on previous experimental results and literature data. The mass transfer coefficient between bubbles and the dense phase was determined by k_be = 0.21d_b. A theoretical analysis of the mass transfer coefficient between a bubble and the dense phase using diffusion equations showed that the mass transfer coefficient between a bubble and the dense phase is in both three- and two-dimensional fluidized beds. An effective diffusion coefficient in gas fluidized beds was introduced and correlated with bubble size as D_e=13.3d_b^2.7 for Group A and Group B particles. The mass transfer coefficient kbe can then be expressed as for bubbles in a three-dimensional bed and for bubbles in a two-dimensional bed.

Graphical abstract

Keywords

Fluidized beds; Bubbles; Dense phase; Mass transfer; Effective diffusion coefficient

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