1213 固気二相粒子クラスター流動の数値解析 : 粒径分布の影響について

概要

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Particle clusters formed in gas-solid flows in risers of circulation fluidized beds or in pipes of pneumatic transport system give much influence to various kinds of transportation phenomena. Therefore, we investigated the flow structure with clusters numerically. The Lagrangean/Eulerian approach and the two-way coupling were adopted because the solid phase largely affects the gas flow. The gas flow was solved by means of the direct numerical simulation (DNS). The motion of individual particles was calculated taking account of particle-size distribution and particle-particle collision by determininsic method. The calculated results were compared with experimental ones measured in a vertical duct, such as fluctuations of local solid volume fraction measured by optical fiber prove and spatial cluster structures observed by means of a laser sheet.
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