Abstract
Attention was paid to the unsteady natures in a gas-solid fluidized bed in order to clarify the fundamental mechanism of heat transfer in a fluidized bed heat exchanger. The following unsteady local properties were measured simultaneously around a heated circular cylinder in a fluidized bed: (1) heat transfer coefficient, (2) wall pressure and (3) discrimination between emulsion and void phases. Those unsteady signals were analyzed statistically. The arrival frequency of bubbles on the cylinder surface, the mean contact time of the emulsion and bubble with the cylinder surface, the rate of contribution of the emulsion and bubble to heat transfer coefficient, etc. were obtained. On the basis of these characteristics, a new model of heat transfer around a circular cylinder was developed, in which the effect of the sliding of the emulsion was considered. Finally, the dominant mechanism of heat transfer was made clear quantitatively.
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