Abstract
Movements of solid particles were observed by photography around a fixed plate immersed in a two dimensional fluidised bed, and were found to be very complicated, making the boundary zone of solids on the plate different from the freely fluidised zone.
The height of the fixed dead zone in the boundary zone was studied experimentally with different conditions of gas velocity and gas distributor. Judging from those observed results, the fluidised bed should be treated as a fluid also having the property of solid beds.
