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Mixing Analysis in a Stirred Tank Using Computational Fluid Dynamics

Journal of Applied Mathematics and Physics 2015年第6期3卷 637-642页

作者： C. P. K. Dagadu z. stegowski B. J. A. Y. Sogbey S. Y. Adz.klo Ghana Atomic Energy Commission Legon Accra Ghana Faculty of Physics and Applied Computer Science AGH-UST Krakow Poland

In this study computational fluid dynamics (CFD) approach was used to study mixing in an Industrial gold leaching tank. The objective was to analyz. the extent of mixing in the tank by producing visual images of the various mixing z.nes in the tank domain. Eddy viscosity plots that characterise the extent of mixing in the tank were generated in the flow field obtained by an Eulerian-Eulerian approach. The extent of mixing was found to be greatest in the circulation loops of the impeller discharge region and least at the top and bottom portions of the tank. Trailing vortices that contribute to some level of mixing were identified in between the impeller blades. This approach could be used to enhance optimum design of mixing vessels and to eliminate the need for pilot plants.

关键词： Computational Fluid Dynamics Residence Time Distribution Eulerian-Eulerian Approach Multiple Reference Frame Eddy Viscosity Plot Turbulent Schmidt Number

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Determination of Flow Structure in a Gold Leaching Tank by CFD Simulation

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Journal of Applied Mathematics and Physics 2014年第7期2卷 510-519页

作者： C. P. K. Dagadu z. stegowski L. Furman E. H. K. Akaho K. A. Danso Faculty of Physics and Applied Computer Science AGH-UST Krakow Poland Ghana Atomic Energy Commission Legon Accra Ghana

Experimental residence time distribution (RTD) measurement and computational fluid dynamics (CFD) simulation are the best methods to study the hydrodynamics of process flow systems. However, CFD approach leads to better understanding of the flow structure and extent of mixing in stirred tanks. In the present study, CFD models were used to simulate the flow in an industrial gold leaching tank. The objective of the investigation was to characteriz. the flowfield generated within the tank after process intensification. The flow was simulated using an Eulerian-Eulerian multi-fluid model where the RANS standard kmixture model and a multiple reference frame approach were used to model turbulence and impeller rotation respectively. The simulated flowfield was found to be in agreement with the flow pattern of pitched blade axial-flow impellers that was used for mixing. The leaching tank exhibited good “off-bottom suspension” which reveals minimum deposition of gold ore particles on the bottom of the leaching tanks. Simulation results were consistent with experimental results obtained from a radioactive tracer investigation. CFD approach gave a better description of the flow structure and extent of mixing in a leaching tank. Hence it could be a preferred approach for flow system analysis where the cost of experimentation is high.

关键词： Residence Time Distribution Computational Fluid Dynamics Navier Stokes Equations Eulerian-Eulerian Multi-Fluid Model RANS Standard k-ε Mixture Model Multiple Reference Frame

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