Segregation and dispersion of a binary system of particles in a fluidized bed

A generalized segregation and dispersion model for liquid-fluidized beds

“…Galvin et al (2006) found that, for a relatively narrow range of particles, a single value of = 0.7 was sufficient to describe the dispersion coefficient over a broad range of fluidization velocities. In the present study we examined the variation in the required value of based on the dispersion coefficient data from the literature.…”

“…We have used a solution domain typically up to 6 times the "observed" bed height. Galvin et al (2006) used a general relationship for the dispersion coefficient of a particle species given by…”

“…In practice, industrial systems are dynamic, and in some cases, such as jigs, the fluidization velocity varies continuously with a pulse-like waveform. Finally, Galvin et al (2006) did not consider the generality of their model for the dispersion coefficient by validating their work against the broad range of conditions covered in the literature.…”

“…While the analytical model proposed by Galvin et al (2006) made an important advance in describing the segregation and dispersion, its analytical nature represented a significant limitation. Firstly, the model only captured the effects of the dispersion and segregation between the two mono-component zones of the binary system of particles.…”

“…For example, Dorgelo et al (1985) and Kang et al (1990) expressed the effect of the fluidization velocity on the dispersion coefficient using scaling laws of the form D ∼ v f . Later, Galvin et al (2006) developed an analytical model of the steady-state segregation and dispersion of a binary system of particles in a liquid-fluidized bed. Here, the key advance was the identification of a generalized description of the dispersion coefficient, based on the kinetic theory of gases.…”