1986

Mojtahedi, Wahab

The results of investigation of spatial frequency distributions of bubbles in a freelybubbling three dimensional gas fluidised bed are reported. Two different gas distributor plates, one made from sintered metal and the other a simple perforated plate, were used and results compared under identical fluidising conditions.Two modes of bubble detection (and collection) are described.One sampling system, which is designed to enable correct measurements of bubble rise velocities, excludes a high number of small bubbles encountered by the probe.A second system of bubble detection, described in this paper, enabled much more accurate estimate of bubble frequencies to be made.In the course of this investigation, more extensive information has been gained as to the spatial distributions of bubbles in gas fluidised beds.