Types of gas fluidization of cohesive granular materials.
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.
Valverde
Jose Manuel
JM
Faculty of Physics, Universidad de Sevilla, Avenida Reina Mercedes s/n, 41012 Sevilla, Spain.
Castellanos
Antonio
A