Abstract
In this paper, a novel technique for evaluating the mixing situation of particles in a fluidized bed is proposed by using a concept of the apparent deffusion coefficient of the fluidized particles. Mixing motion of the particles was visualized in an experimental fluidized bed; the bed contained spherical particles covered with a photochromic dye, and the fluidized particles in a small portion were "marked" with an UV laser irradiation. In order to evaluate the apparent diffusion coefficient, the visualized increase with increasing the superficial gas velocity. The authors therefore concluded that the technique proposed in this paper is feasible for evaluation the mixing situation of the fluidized particles.
