This reported investigation dealt with the effect of the addition of internal blades to a fluidized bed and how this modification affected the bed's minimum fluidization velocity and the particle agglomerate size of LiF. This modification resulted in a new concept of dimensionless fluidization that can be used to quickly compare the fluidization quality of various types of fluidized beds. The experimental results showed that the fluidization in the bed that contained internal blades was better than the fluidization of a bed containing only LiF powder. When internal blades were added, large aggregates were found to collide with the blades and the walls of the bed as a result of airflow, resulting in fragmentation and improved fluidization of smaller aggregates. A vertical component force of the internal blades was used to modify the original Zhou-Li force balance model. The calculated results for the agglomerates in the LiF internal blade-bed using the modified Zhou-Li equation agreed well with the experimental data. Therefore, it was concluded that the modified Zhou-Li equation was adequate for predicting the size of the LiF agglomerates in a fluidized bed. (C) 2019 Elsevier B.V. All rights reserved.