This paper describes the use of a capacitance tomography system for imaging gas bubbles in a fluidized bed in the vicinity of an air distributor plate. The results show how the solid concentration distribution varies as a function of time for three different flow regimes: bubbling, slugging and the transition to turbulent. Bubble shape, Length and coalesence can be observed. A method of spatial correlation to elucidate the bubble formation process is described.
Wang, S., Dyakowski, T., Xie, C. G., Williams, R. A., & Beck, M. S. (1996). Tomographic imaging of phase distribution and spatial correlation of the fluidization dynamics in a fluidized bed. Particle and Particle Systems Characterization, 13(5), 333-338. https://doi.org/10.1002/ppsc.19960130514