In the present study, a new correlation was proposed to quantify the effect of the 2D geometry on the minimum fluidization velocity, and the results indicated that the minimum fluidization velocity in a 2D bed increases with an increase in the ratio of the particle size to the bed thickness (dp/t) Alternatively, negligible differences were observed when the fixed height of the bed was varied (in contrast to the results obtained by Ramos Caicedo et al.). In addition, the proposed model by Jackson was used to characterize wall effects; however, due to the 1D assumptions of the model (the voidage varies with the bed height ε(z)) , general conclusions could not be obtained because the voidage distribution during the fluidization–defluidization process varies with the height and the width (ε(x, z)) of the bed.