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The proper choice of the dryer configuration for seeds drying is essential to preserve their quality during this process. Drying of soybean seeds was studied in this work using a non-conventional c...

Camu-Camu (Myrciaria dubia) is a native fruit from the Amazon region, which is still little known by most people, but that has been arousing great interest from the scientific community due to its ...

The main objective of the present work was to investigate the microwave drying kinetics of drill cuttings contaminated with an olefin-based fluid in a bench-scale microwave oven. Drying tests were ...

Although rotating dryers with flights have been extensively used in industrial applications, there is still a lack of universality in the literature models to estimate their design loading. The aim...

Many spouted bed applications involve mixtures of particles of different sizes, shapes, or densities. Depending on the characteristics of the particle mixture, undesirable phenomena such as particle segregation may occur, mainly due to differences in terminal velocities. Thus, a better understanding of the fluid dynamics of particle mixtures is still needed in this field. In this work, experiments and computational simulations were performed to analyze some aspects of the fluid dynamics of segregation patterns in conical spouted beds with binary mixtures. The simulated results are consistent with experimental data and can be used to predict regions of particle mixing or segregation in spouted beds.

The flotation selectivity of apatite particles from a carbonatite complex was investigated in a flotation column as a function of particle size and reagent concentrations. Experiments were performed according to a factorial experimental design. Fine and coarse particles showed different sensitivities to variations in the concentration of the reagent. Coarser particles showed a higher selectivity ratio and greater sensitivity to the addition of different reagent dosages, providing a more selective separation and a better quality product. Finer particles presented lower selectivity ratios, reflecting the difficulty involved in the concentration process with this particle size.

In this work, a model based on population balance equations applied to perfect mixture domains has been employed to represent the coating of soybeans with fertilizer in a conical–cylindrical spouted bed. The results of the present model provided explicit equations for the coating mean and variance. The coating mass distribution function was validated against experimental data. The effect of operational time on the distributions was analyzed, showing that the coating uniformity can be improved by increasing the operating time.

Knowledge about the gas and particle dynamics in spouted beds is important in the evaluation of particle circulation rates and the efficiency of gas-solid contacts. In this work, the mechanism of transition from a static bed to a spouted bed was numerically simulated using a Eulerian multiphase model. This model was applied to two distinct spouted bed geometries: a conventional device and a spouted bed with draft tube. The radial voidage and particle velocity profiles along the longitudinal position in the annular and spout regions were simulated for the geometries under study. The characteristic simulated curves were congruous with the experimental data.