Experimental study and simulation of bubble fluidization

Abstract

The objectives of this study were to measure the particl granular temperature in gas-solid fluidization using a CCD camera technique, to simulate the model for bubble fluidization, and to compare the experimental results with the simulation results. Granular temperatures and bubble properties were measured in a two-dimensional fluidized bed using 530 um diameter glass beads and a uniform inlet gas velocity. At a low gas inlet velocity of 33.55 cm/sec, the bubble diameter was higher than that calculated by Davidson model due to an error by the measurement in the bubble burst region. Bubble rising velocity was near that calculated by Gidaspow model. At a high gas inlet velocity of 58.7 cm/sec, two granular temperatures; particle granular temperature and bubble-like granular temperature, were measured from experiment. The particle granular temperature was obtained from particle velocity oscillations per photograph of CCD camera. The bubble-like granular temperature was received from the bubble motion. It was found that the bubble-like granular temperature from the bubble motion was higher than that of particle velocity oscillation. The simulation calculated the axial and radial velocity in the bubble. The errors of the radial velocity between the experiment and simulation were from 1.49-48.87% and that of the axial velocity were from 13.21-38.16%