Heat transfer to a single smooth vertical tube immersed in an air fluidized bed

Heat transfer coefficient for a vertical smooth coaxial heat transfer tube is measured in a cylindrical air fluidized bed as a function of fluidizing velocity, temperature and particle size. The qualitative variations of heat transfer coefficient with these parameters are consistent with the general picture of heat transfer mechanism and with the general picture of heat transfer mechanism and with the limited data available in the literature. The solids movement and mixing in the bed is investigated by measuring heat transfer coefficient at different radial locations in the bed as a function of temperature and gas velocity. A quantitative interpretation of these and of similar other data being generated in our laboratory will be published in the near future.