, ρg ρs , L dp , D dp which represent Froude number, modified Archimedes number, density ratio, ratio of bed height to particle diameter, and ratio of bed diameter to particle diameter respectively. Albeit, it might not be possible to consider all the non-dimensional groups at once to scale a system from laboratory-scale to pilot-scale or industry-scale. This would require changing the properties of material as well as fluidizing medium which might not be practical .