Abstract
To avoid the complicated system and additional pump power required for a gas-solid suspension flow, the authors proposed a new concept of an impinging air jet laden with solid particles recirculating in an enclosure, and the heat transfer characteristics were experimentally studied. As the first step of this study, this paper deals with the flow characteristics of gas-solid suspension in the enclosure. Since a preliminary experiment showed that the configuration of the cell and the position of the gas exhaust hole strongly affect the flow pattern and the impinging particle volume fraction, gas-solid two-phase flow within two types of cells, namely parabolic plane cell and inclined plane cell, was examined. In addition to the observation of flow pattern and measurement of pressure drop, the volume fraction distribution of particles was obtained through an optical experiment. By comparing the results of the two cells, it was clearly shown that the flow pattern within the parabolic plane cell is a smooth two phase flow pattern and thus the volume fraction of impinging particles is higher than that of the inclined plane cell. The results enable us to predict that the parabolic plane cell has more favorable characteristics for heat transfer enhancement.
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