Dispersion and Fluctuation of Fluidized Particles in a Liquid-Solid Fluidized Bed

A generalized segregation and dispersion model for liquid-fluidized beds

“…The need to fit the dispersion coefficient to the data has been a significant weakness in studies of liquid-fluidized beds (Epstein, 2005). 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.…”

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

“…A full understanding of the functional dependence of the dispersion coefficient D, on the operating conditions should permit a complete description of the concentration profiles at any fluidization velocity. In previous studies, the effect of the fluidization velocity on the dispersion coefficient has usually been expressed in terms of simple scaling laws [4][5][6] of the form, DϳU ␤ . It is worth considering the approach taken based on the kinetic theory of gases to obtain an expression for the dispersion coefficient.…”

Particle dispersion in a binary solid‐liquid fluidized bed

“…While the pressure gradient data of Juma and Rich- ardson (1983) were processed in conjunction with the convection-segregation model presented above to obtain particle mixing coefficients, the steady-state axial transport of heat was used by Lee and Kim (1990) for the evaluation of particle dispersion. On the other hand, Kang et al (1990) and Yutani et al (1982) basically employed a pressure relaxation method for quantifying the particle mixing characteristics in liquid fluidized beds. The database of Table 1, therefore, rules out any possibility of error involved with a particular measurement technique influencing the correlation here.…”