Abstract
A CFD-DEM particle dissolution model was established to study the particle dissolution process in a stirred tank. Firstly, the model's accuracy in simulating particle size and solute concentration was validated against experimental results, the errors were 6.13% and 12.5%, respectively. Secondly, the study delved into the mechanism of mass transfer dissolution from three dimensions: solute concentration distribution, particles spatial distribution, and energy dissipation rate of particles. It was found that the larger the concentration gradient, the better the dissolution of particles. As the dissolution progresses, the coupling force between the fluid and the particles weakens, and smaller particles are more easily suspended. Lastly, the dissolution behavior of particles at different rotation speeds was investigated. Stirring speed can significantly improve the dissolution rate of particles in the particle suspension and dispersion stage, but the difference of different rotational speeds on the dissolution rate becomes smaller in the particle circulation flow stage.
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