Abstract
The motion of a solid particle which was allowed to drift in a liquid phase was pursued by a camera to find the following:
(1) There is no remarkable irregularity of liquid flow in the bubble column.
(2) The distribution function of axial displacements of a solid particle was discribed by the normal distribution function. The assumed dispersion model coincided well with the experimental results. From this fact the mechanism of the mixing of liquid element was considered to be analogous to that of diffusion. The dispersion coefficient was also determined experimentally.
(3) The dynamic behaviour of bubbles, especially the coalescence of bubbles, has the controlling effect on the gas holdup and the dispersion coefficient.
