Effects of bed size on the voidage in gas-solid bubbling fluidized beds

The effects of bed size on the voidage in gas-solid bubbling fluidized beds were statistically studied. The experiments were conducted in plexiglass fluidized beds with different sections, and glass beads were used as bed materials. The voidage signals were measured at different axial positions in the beds. The average, standard deviation, skewness, and kurtosis of the voidage signals were analyzed. The results showed that the voidage and its dispersion degree decreased with increasing bed size, while the asymmetry and steepness degree increased. The bed size had a stronger effect on the voidage at lower axial positions. The relationship between the bed size and theoretical size of some bubbles was predicted. The transition gas velocity from local fluidization to complete fluidization was obtained. (c) 2021 Published by Elsevier B.V.

Automated summary

This study statistically analyzed the effects of bed size on voidage in gas-solid bubbling fluidized beds. Results showed that with increasing bed size, voidage and its dispersion degree decreased, while asymmetry and steepness degree increased. Bed size had a stronger impact on voidage at lower axial positions.