| A gas-solid bubbling fluidized bed is considered to be a non-homogeneous, chaotic system in which the hydrodynamics is complex and the fluidization quality is hard to control (Coppens and van Ommen, 2003). The bubbling fluidized bed hydrodynamics is determined by the motion of the gas bubbles which is responsible for the improved gas and solids mixing. However, large bubbles tend to reduce the gas-solid contact and restrict the heat transfer. In beds of very fine particles, agglomeration of particles results in channeling and poor fluidization quality. In order to enhance the performance of fluidized beds, one of the methods that can be employed is flow pulsation.; The objective of this thesis is to investigate the hydrodynamics and bed-to-surface heat transfer in a gas-solid pulsed bubbling fluidized bed. Experiments are carried out in a laboratory scale (0.17 m ID, 0.9 m high) Plexiglas bubbling fluidized bed with different groups of particles ranging from Geldart A to Geldart B/D. (Abstract shortened by UMI.)... |
