Publication Date:
2013-11-06
Description:
Gas-solid motions in a three-dimensional conical spouted bed with a draft tube are investigated based on a simulation carried out by the coupling approach of computational fluid dynamics combined with the discrete-element method. The distribution properties of the velocity, the concentration, and the flux of the solid phase are discussed. The vertical solid velocity in the central region initially increases, diminishes gradually, and finally decreases sharply in the region above the draft tube. Vigorous lateral solid motion occurs in the periphery of the fountain and the spout-annulus interface. In addition, the vertical solid flux shows a large value in the spout. A larger vertical velocity but a more dilute solid concentration can be detected along the axial direction when enlarging the gas flow rate. The effects of a draft tube on the dynamics in a spouted bed need to be considered for efficient operation. Gas-solid motions in a 3D conical spouted bed with a draft tube are simulated by coupling computational fluid dynamics with the discrete-element method. The gas motion is solved at the computational grid level while the solid motion is tracked on the particle scale.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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