“…There are several experimental (Wu and Baeyens, 1998;Gibilaro and Rowe, 1974;Nienow et al, 1978;Garcia-Ochoa et al, 1989;Rasul et al, 1999;Marzocchella et al, 2000;Jang et al, 2010;Chen and Guo, 2011;Oshitani et al, 2013;Tabrizi et al, 2013) or numerical (Rhodes et al, 2001;Gera and Syamlal, 2004;Feng et al, 2004;Dahl and Hrenya, 2005;Feng and Yu, 2006;Norouzi et al, 2012a;Alavi Shoushtari et al, 2013;Amiri and Movahedirad, 2017;Gosavi et al, 2018;Fan et al, 2018) studies for investigating the mixing or segregation of fluidized beds of solid particles. Gibilaro and Rowe (1974) presented a model for the solid particles concentration as a function of the bed height and validated this model by using their experimental investigations.…”