The Effects of Particle Size on Particle Behavior and Heat Transfer around Horizontal Tube in a Fluidized Bed

The effects of particle size on the particle behavior and heat transfer coefficient around a horizontal tube in a gas-solid fluidized bed were quantitatively investigated. Three kinds of glass beads with different average diameters (0.2, 0.42, and 1.0 mm) were used in this experiment. The local particle behavior and instantaneous heat transfer coefficient on the tube surface were simultaneously measured. Comparing the experimental results with the existed theoretical heat transfer model, the differences of the heat transfer mechanisms between the different particle sizes were made clear.