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Mathematical Problems in Engineering
Volume 2016 (2016), Article ID 8256816, 11 pages
http://dx.doi.org/10.1155/2016/8256816
Research Article

A Bubble-Based Drag Model at the Local-Grid Level for Eulerian Simulation of Bubbling Fluidized Beds

1School of Chemical Engineering, Huaiyin Institute of Technology, Huaian 223003, China
2Jiangsu Provincial Engineering Laboratory for Advanced Materials of Salt Chemical Industry, Huaiyin Institute of Technology, Huaian 223003, China
3Department of Chemical Engineering, Pakistan Institute of Engineering & Applied Sciences, Islamabad 45650, Pakistan

Received 29 April 2016; Revised 25 August 2016; Accepted 7 September 2016

Academic Editor: Payman Jalali

Copyright © 2016 Kun Hong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A bubble-based drag model at the local-grid level is proposed to simulate gas-solid flows in bubbling fluidized beds of Geldart A particles. In this model, five balance equations are derived from the mass and the momentum conservation. This set of equations along with necessary correlations for bubble diameter and voidage of emulsion phase is solved to obtain seven local structural parameters (, , , , , , and ) which describe heterogeneous flows of bubbling fluidized beds. The modified drag coefficient obtained from the above-mentioned structural parameters is then incorporated into the two-fluid model to simulate the hydrodynamics of Geldart A particles in a lab-scale bubbling fluidized bed. The comparison between experimental and simulation results for the axial and radial solids concentration profiles is promising.