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Partic. vol. 40 pp. 10-22 (October 2018)
doi: 10.1016/j.partic.2017.11.006

Fluidization of binary mixtures of sisal residue and sand: A new model for deriving the final fluidization velocity

David Vasconcelos, Gabriele Batalha, Luis Gabriel Pereira, Carlos Augusto Pires*

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    • A novel model for fluidization of a binary mixture of biomass and sand was developed. • Discrepancy between measured and model predicted Umf was calculated and compared. • Discrepancies for sisal residue were 15.32% (literature) and 12.23% (new model). • Discrepancies for other biomasses were 17.4% (literature) and 20.5% (new model).


The influence of different factors on the fluidization of a binary mixture of sisal residue and sand was investigated. The particle sizes of the sand and sisal residue were varied from 0.2 to 0.8 mm and the biomass mass fractions from 2% to 9%. Some segregation was noted, and a significant relationship was found among the final fluidization velocity (Uff), the biomass and sand sizes, and the biomass mass fraction. A novel model was developed for predicting Uff, leading to an average discrepancy of 12.69% between the measured and predicted Uff compared with the best match of 15.32% when using a model from a previous paper. The new model was applied to data from studies using other biomass and a broad range of particle characteristics. The average divergences from measured values when using the new model were 7.9% for corn cob and walnut shell, and 20.5% for sweet sorghum bagasse, tobacco residue, and soy hulls. These were superior to the values derived using other models. Our results confirm the accuracy of the model developed in this work and show that it represents a viable alternative way to calculate Uff for a binary mixture of sand and biomass.

Graphical abstract


Fluidization; Binary mixture; Sisal residue; Final fluidization velocity model