
Fluidization uniquely allows particulate solids to behave like fluids within a fluid stream. This phenomenon represents a special case of fluid-solids flow. During fluidization, fluid flow resistance occurs through the voids in a bed of solids. This resistance results from the total drag exerted by all the particles in the bed.
Fluidization characteristics in powder processing: Fluidized bed functions
Fluidization uniquely allows particulate solids to behave like fluids within a fluid stream. This phenomenon serves as a special case of fluid-solids flow. During fluidization, fluid flow resistance occurs through the voids in a bed of solids. This resistance results from the total drag exerted by all the particles in the bed.
Minimum fluidization velocity
Fluidization uniquely allows particulate solids to behave like fluids within a fluid stream. This phenomenon represents a special case of fluid-solids flow. During fluidization, fluid flow resistance occurs through the voids in a bed of solids. This resistance arises from the total drag exerted by all the particles in the bed.
The superficial gas velocity at which a bed of powder is just fluidized is the minimum fluidization velocity. You can characterize this state of incipient fluidization by measuring the pressure drop of a gas flowing through a packed bed.
At a specific gas velocity, bubbles begin to form. This velocity is known as the minimum bubbling velocity. As a bubble rises through the fluidized bed, it carries some solids with it. This action further influences the behavior of the mixture.