Abstract
The impact efficiency of air-borne fine particles on a bed particle has been studied, extending over wide range of the bed porosities. The conventional cell model seems to be effective in predicting the impact efficiency only when the bed porosity is high enough. Two bed structure models besides the conventional cell model were introduced and tested in this paper. A modified cell model in which fine particles enter a cell from a narrow area and at an accelerated velocity is useful when the bed porosity is more than 0.8. An impactor model which considers a bed as a round nozzle cascade impactor with a small aspect ratio was found to be effective when the bed porosity is less than 0.8.
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