Abstract
Two-phase CFD simulation of the monodyspersed suspension hydraulic behaviour in the tank apparatus from a circulatory pipe The hydrodynamics in fluidized-bed crystallizers is studied by CFD method. The simulations were performed by a commercial packet of computational fluid dynamics Fluent 6.x. For the one-phase modelling (15), a standard k-ε model was applied. In the case of the two-phase flows the Eulerian multi-phase model with a standard k-ε method, aided by the k-ε dispersed model for viscosity, has been used respectively. The collected data put a new light on the suspension flow behaviour in the annular zone of the fluidised bed crystallizer. From the presented here CFD simulations, it clearly issues that the real hydraulic conditions in the fluidised bed crystallizers are far from the ideal ones.
Highlights
Fluidized-bed crystallizers have been used in industrial practice since 19251
From the presented here CFD simulations, it clearly issues that the real hydraulic conditions in the fluidised bed crystallizers are far from the ideal ones
Zastosowanie obliczeniowej mechaniki p3ynów (CFD) w in¿ynierii chemicznej i procesowej, In¿
Summary
Fluidized-bed crystallizers have been used in industrial practice since 19251. The devices are exploited mostly when large (>1mm) crystals are desired. Frances et al.[3] utilised, on the contrary, an idea of a series of ideal mixers, one upon another as one multistage crystallizer, in order to take into account segregation and particles mixing within the bed This model was compared to the experimental data of the laboratory-scale crystallization of tetrahydrate sodium perborate. The authors have developed their model on the basis of Kennedy and Bretton[14] and the well-known HTU notion They have assumed that the fluidized-bed behaves as a perfect classified bed with one exception – there is a size distribution in every slice of the bed caused by axial dispersion. Simple calculations give equivalent porosity at the bottom of the classification leg equal to ε = 0.7328 This value is required for the computation of crystals sedimentation velocity e.g.17. To obtain the steady state and the convergence of 104 – 10-6 of the normalized residuals, about 1500 to 3000 first order upwind iterations were required for the MP model
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
