ベンドを通過する固気二相流 : 続報,粒子速度,濃度の断面内分布およびベンドの下流への影響

概要

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Distributions of particle velocity and concentration were investigated in a pipeline with a 90゜ horizontal-to-vertical bend. Measurements were performed with an optical fiber probe for three characteristic flow patterns, i. e. dispersed flow, dispersed biasing flow and sliding bed flow, as classified in our previous work. It was found that the distributions were strongly affected by the flow patterns. The velocity distributions in the sliding bed flow were nonuniform and had large gradients, while the distributions in the dispersed flow were nearly uniform across the section. The difference due to the flow patterns was more marked in the results for concentrations. The profiles of concentrations were extremely distorted in the bend owing to the centrifugal force. Moreover, unexpected results were obtained in regard to the variation of the concentration profiles after the bend. At first, the profiles showed an opposite asymmetry in the straight pipe, after which they gradually became uniform. In spite of the above distorted distributions, calculations of particle velocities based on the one-dimensional model agreed well with the experimental results in the straight pipe after the bend.
一般社団法人日本機械学会の論文
1989-10-25