Analysis of the Flow Characteristics of Multiphase Flow Fields in the Mixing Agitator

Abstract:

The numerical simulation for the flow characteristics of multiphase flow fields in the multiple-blade mixing agitator is carried out by means of combining of the large eddy simulation (LES) and multiphase flow model. Then the flow pattern changes and material mixing rule at different speed conditions are analyzed. The result shows that complicated circular flows form among the four groups of blades in the axial cross section. In the mixing process, the upper solid-liquid mixture is transported to the bottom of the agitator under the action of gravity and fluid shear. Finally it mainly distributes at the agitator walls and the inverted cone manifold in the center of the agitating shaft. With the gradually increasing in the agitation rate, there are a large amount of vortex structures near the blade. Then spiral vortex distribution areas are formed.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 3167-3170
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.3167
• Online since: July 2014
• Authors: Xiao Bing Wang
• Keywords: Flow Characteristic, Large Eddy Simulation, Mixture and Agitation, Multiphase Flow, Numerical Analysis

References

[1] T Hiroshi, N Kuni, K Hideki, et al. Numerical simulation of mixing flows in agitated vessel with impellers and baffles [J]. Computers Fluids, 1993, 22(4): 223-228.

DOI: 10.1016/0045-7930(93)90054-d

[2] R K Avinash, A T Philippe. CFD simulation of gas-liquid flows in stirred vessel equipped with rushton turbine: influence of parallel, merging and diverging flow configurations [J]. Chemical Engineering Science, 2008, 63: 3810-3820.

DOI: 10.1016/j.ces.2008.04.039

[3] A Delafosse, A Line, J Morcjain, et al. LES and URANS simulation of hydrodynamics in mixing tank: Comparison to PIV experiments [J]. Chemical Engineering Research and Design, 2008, 86: 1322-1330.

DOI: 10.1016/j.cherd.2008.07.008