Application of fast X-ray CT scanner to visualization of bubbles in fluidized bed

A fast-scanning X-ray CT system, designed for measuring dynamic events in m ultiphase fluids, was used to obtain the transient 2-dimensional cross sect ional gas-phase distribution in a fluidized bed. The captured data was sent to a PC for image reconstruction, and the density distributions across the column cross section were visualized, Using image processing techniques, a pseudo 3-dimensional image of bubbles was obtained. The spatial and time r esolutions of the system were sufficient for the measurement of ascending b ubble behavior in a fluidized bed with fine particles. Bubble shape, interf acial area, and bubble holdup over the cross section can be measured by thi s system.