抄録
Sizes and rising velocities of bubbles in a gas fluidized bed composed of two kinds of particles of different sizes but of the same density were observed by optic fiber probes. In all, three kinds of particles were used for the measurement of bubble behavior. The bubble growth ratio showed a minimum at 0.4 mass fraction of the finer of the two kinds of component particles. Bubble diameters showed a linear change with the height of rise above the distributor up to the maximum attainable diameter, and then remained constant. The bubble growth ratio can be correlated better by the bubble rising velocity, which is regarded as one kind of index of the fluidity of the bed particles, rather than by the mass fraction of the particle. Bubble growth is strongly correlated with the bubble rising velocity, and both seem to be controlled by the fluidity of the bed particles. On the basis of the results obtained, a method for determining the bubble diameter in the system of two kinds of component particles at any height was proposed.
