title: Types of gas fluidization of cohesive granular materials.
abstract: Some years ago it was shown that gas-fluidized powders may transit from solid-like to fluid-like fluidization prior to bubbling, shedding light on a long-standing controversy on the nature of "homogeneous" fluidization. In this paper it is shown that some gas-fluidized powders may also transit from the fluid-like regime to elutriation, with full suppression of the bubbling regime. We provide a diagram that can be used to predict these types of fluidization exhibited by cohesive powders based on simple phenomenological equations in which particle aggregation due to attractive forces is a key ingredient.
authors.affiliation: Faculty of Physics, Universidad de Sevilla, Avenida Reina Mercedes s/n, 41012 Sevilla, Spain.
authors.forename: Jose Manuel
authors.initials: JM
authors.lastname: Valverde
authors.forename: Antonio
authors.initials: A
authors.lastname: Castellanos