Abstract
The paper explores a tandem configuration of three-blade impellers in a stirred reactor. The working fluid is a liquid-solid mixture and the stirring mechanism fitted with the two impellers must prevent the sedimentation of solid particles while homogenously dispersing them in the bulk liquid. The present numerical investigation, performed with the expert software Ansys® Fluent, Release 16, employs the Eulerian multiphase model along with the RNG k–ε turbulence model to simulate the free-surface liquid–solid flows in the baffled stirred reactor. A sliding mesh approach is used to model the impellers rotation. The tandem configuration is clearly superior to a single impeller, while the existing electrical motor that drives the stirring mechanism still provides the necessary power.
Highlights
Stirred reactors with baffles are used in the chemical industry to obtain chemical products by mixing two or more components, [1]
For the analysed industrial reactor is important that the stirring mechanism to generate a homogenous suspension of the solid particles in the entire volume of the liquid phase
It is important for obtaining a good quality chemical product that all the solid particles remain suspended in the volume of liquid for a sufficient period of time for the chemical reaction to take place
Summary
Stirred reactors with baffles are used in the chemical industry to obtain chemical products by mixing two or more components, [1]. The quality of the final chemical product obtained inside the industrial reactor is influenced by the performance of the stirring mechanism that equips the reactor. Using CFD for modelling the complex flow inside industrial reactors proves to be an efficient, time saving and tractable method to analyze the performances of the stirring mechanism that is present in the reactor. A part of the previous research focused on identifying the appropriate turbulent model to be used [5,6] Another preoccupation of the researchers was to identify the best suitable model for modelling the solid suspension inside the liquid volume from the ones available in the expert CFD codes [10,11,12,13,14,15,16,17,18,19,20]
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