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Effect of Gaussian size distribution width on minimum fluidization velocity in tapered gas–solid fluidized beds

Particuology 2022年第7期20卷 71-84页

作者： mojtaba rasteh.goodarz ah.adi S.H.Hosseini Department of Chemical Engineering Hamedan University of TechnologyHamedanP.O.Box 65155-579Iran Department of Mechanical and Aeronautical Engineering Clarkson UniversityPotsdamNY 13699-5725USA Department of Chemical Engineering Ilam UniversityIlam 69315-516Iran

This paper investigated the effect of Gaussian distribution width,average particle diameter,particle loading,and the tapered angle on minimum fluidization velocity(U_(mf))by conducting extensive experiments in tapered fluidized *** powders with Gaussian size distribution and different distribution widths were used in the *** increase in U_(mf)with increasing the average particle diameter,particle loading,and the tapered angle was *** was also a nonmonotonic behavior of Umf as the Gaussian distribution width *** empirical correlation including dimensionless groups for predicting Umf in tapered beds was developed in which the effect of distribution width was *** proposed correlation predictions were in good agreement with the experimental data,with a maximum deviation of 16.5%and average and standard deviations of,respectively,6.4%and 7.4%.The proposed correlation was also compared with three earlier models,and their accuracy was discussed.

关键词： Tapered fluidized bed Minimum fluidization velocity Gaussian size distribution Distribution width Dimensional analysis

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Segregation behavior of a ternary mixture of titanium dioxide particles in a pseudo two-dimensional fluidized bed

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Particuology 2021年第1期19卷 78-90页

作者： mojtaba rasteh Alireza Bahramian goodarz ah.adi Department of Chemical Engineering Hamedan University of TechnologyHamedanP.O.Box65155-579Iran Department of Mechanical and Aeronautical Engineering Clarkson UniversityPotsdamNY 13699-5725USA

The segregation behavior of a mixture of silica-coated titanium dioxide(TiO2)particles of three different sizes in a pseudo two-dimensional fluidized bed was studied experimentally by the freeze-sieving method and numerically by the multi-fluid model(MFM).Three-dimensional computational fluid dynamics(CFD)simulations were carried out to evaluate the effects of the solid wall boundary conditions on particle segregation in terms of specularity and particle-wall restitution *** quantitative indexes of segregation tendency and segregation degree were used to determine the axial segregation of the mixture in triangular *** simulation results revealed that the axial segregation increased with the specularity coefficient,whereas the particle-wall restitution coefficient had a minor effect on axial *** of the simulation results with experimental data showed that the appropriate value of the specularity coefficient used in the CFD model depended on superficial gas *** study of the effects of superficial gas velocity on segregation behavior demonstrated that the greatest segregation was obtained at minimum fluidization velocity and the segregation decreased as the gas velocity gradually increased.

关键词： Ternary mixture Segregation tendency Segregation degree Two-fluid model Computational fluid dynamics(CFD)

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