Alternatively, 2D fluidized beds have been used to study fluidized bed hydrodynamics since the pioneering studies of the early 60's. For example, Trsiakti et al. and Pallarès and Johnsson
monitored the motion of an artificial fuel particle in a 2D fluidized bed with a camera to characterize fuel dispersion and fuel motion within the bed. In addition, Shen et al. and Busciglio et al. measured the size and velocity of bubbles along the height of the bed, and
Santana et al., Müller et al. and Almendros-Ibáñez et al.