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Comparative study of mixing liquids and powders in a continuous medium using CFD

Journal of Engineering Science and Technology Review 2018年第5期11卷 134-138页

作者： Enamorado, Alberto Mario Fuentes Betancourt, Juan Bernardo Restrepo Obregon, Luis Guillermo Research Group in Process Simulation and Coal Transformation Chemical Engineering Program Universidad del Atlántico Barranquilla Colombia Research Group on Sustainable Chemical and Biochemical Processes Chemical Engineering Program Universidad del Atlántico Barranquilla Colombia

Prediction of flow and mixing of powders is a difficult challenge that has not been solved yet. Different numerical methods have been used to find the solution to the mathematical models proposed, but there are no experiments to compare and validate the results. The method with the best approximation is the discrete element method (DEM). However, this method requires a high computational power. In this article, it was made a comparison between the experimental results obtained when mixing two powders in an oscillatory low shear mixing device, and the 3D simulation of the same equipment using liquids with the help of a commercial software of computational fluids dynamics, CFD. Experiments at different wall velocities and wall displacements were run. Results reveal that the mixing in solids and liquids present lots of similarities when working at low velocity. This velocity lets solids to stay in frictional regime and liquids in the laminar regime. A zone of no mixing at the bottom of the mixing cavity is presented in liquids which is similar to the triangular pattern of no mixing found in solids. The height of the no mixing zone depends on the time of mixing, and the displacement and velocity of the walls. Under laminar regime conditions, the Navier Stokes equations can be applied to the powders because the velocity profiles obtained are similar. © 2018 Eastern Macedonia and Thrace Institute of Technology.

关键词： Shear stress

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simulation of a compressible powder flow under oscillatory shear stress modeled as a non-linear fluid by using an explicit solution method

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Journal of Engineering Science and Technology Review 2018年第4期11卷 84-90页

作者： Robledo, Mauricio E. Obregón, Luis G. Velázquez, Carlos Research Group on Process Simulation and Coal Transformation Chemical Engineering Program Universidad del Atlántico Carrera 30 Número 8- 49 Puerto Colombia - Atlántico081007 Colombia Research Group on Sustainable Chemical and Biochemical Processes Chemical Engineering Program Universidad del Atlántico Carrera 30 Número 8- 49 Puerto Colombia - Atlántico081007 Colombia Chemical Engineering Department University of Puerto Rico Mayagüez Campus PO Box 9000 Mayagüez00681 Puerto Rico

The purpose of this research is to develop the modeling and simulation of a frictional and compressible powder flow subjected to oscillatory shear stress in a device that consists of a rectangular shaped cavity with a free surface, two oscillatory moving walls, and three non-moving walls. The finite differences method under the explicit scheme is used to approximate the real solution to the resulting equations from the mathematical modeling of the studied system. The simulation results were compared qualitatively with experimental results, and the solution method was verified by comparing the simulation results of a viscous glycerin flow with the results of the software STAR-CCM+ under the same conditions of the powder flow. The results showed that the powder velocity profiles were coherent with the experimental results. Furthermore, the solution method was validated finding that the 83.5% of the compared data presented absolute errors less than 0.5 cm/s. The complete velocity profiles obtained from the simulation help to have a deep understanding of the granular material behavior subjected to oscillatory shear stress. © 2018 Eastern Macedonia and Thrace Institute of Technology.

关键词： Shear stress

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