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Numerical Investigation of the Effect of Bottom Shape on the Flow Field and Particle Suspension in a DTB Crystallizer


Affiliations
1 Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
 

The influence of the bottom shape on the flow field distribution and particle suspension in a DTB crystallizer was investigated by Computational Fluid Dynamics (CFD) coupled with Two-Fluid Model (Eulerian model). Volume fractions of three sections were monitored on time, and effect on particle suspension could be obtained by analyzing the variation tendency of volume fraction. The results showed that the protruding part of a type bottom could make the eddies smaller, leading to the increase of velocity in the vortex. Modulating the detailed structure of the type bottom to make the bottom surface conform to the streamlines can reduce the loss of the kinetic energy of the flow fluid and obtain a larger flow velocity, which made it possible for the particles in the bottom to reach a better suspension state. Suitable shape parameters were also obtained; the concave and protruding surface diameter are 0.32 and 0.373 times of the cylindrical shell diameter, respectively. It is helpful to provide a theoretical guidance for optimization of DTB crystallizer.
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  • Numerical Investigation of the Effect of Bottom Shape on the Flow Field and Particle Suspension in a DTB Crystallizer

Abstract Views: 61  |  PDF Views: 1

Authors

Hao Pan
Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
Jun Li
Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
Yang Jin
Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
Bo Yang
Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
Xing Li
Department of Chemical Engineering, Sichuan University, Chengdu 610065, China

Abstract


The influence of the bottom shape on the flow field distribution and particle suspension in a DTB crystallizer was investigated by Computational Fluid Dynamics (CFD) coupled with Two-Fluid Model (Eulerian model). Volume fractions of three sections were monitored on time, and effect on particle suspension could be obtained by analyzing the variation tendency of volume fraction. The results showed that the protruding part of a type bottom could make the eddies smaller, leading to the increase of velocity in the vortex. Modulating the detailed structure of the type bottom to make the bottom surface conform to the streamlines can reduce the loss of the kinetic energy of the flow fluid and obtain a larger flow velocity, which made it possible for the particles in the bottom to reach a better suspension state. Suitable shape parameters were also obtained; the concave and protruding surface diameter are 0.32 and 0.373 times of the cylindrical shell diameter, respectively. It is helpful to provide a theoretical guidance for optimization of DTB crystallizer.