粗粒子群の垂直管内水力輸送に関する研究
第1報、固液二相流
1990 年 4 巻 2 号 p. 111-124
詳細
1990 年 4 巻 2 号 p. 111-124
Fully developed liquid-solid two-phase flow in a vertical pipe has been investigated in this paper. Experiments were carried out in a vertical pipe of 26mm I. D. using water and uniform-sized spherical particles of 6.12mm in diameter. The particles were made of ceramics having a density of 2540kg/m3. The volumetric fluxes of water and the particles varied within the ranges of 0≤jL≤1.5m/s and 0.0075≤js≤0.060m/s. The velocity of the particles was determined by a tracer method, i. e. the velocity of a tracer particle of aluminum was measured using a pair of metal detectors. The frictional pressure drop of the flow was also obtained. A simple model to correlate the velocity of coarse particles with the two-phase flow rates, diameter, density and drag coefficient of the particle is proposed. The model is compared with the experimental data of other investigators as well as the present authors and shows better agreement than other correlations tested. As to the frictional pressure drop, the present data are well correlated by the correlations of Durand, Oedjoe et al. and Weber et al. In addition to those, a modified correlation of the Durand's is proposed to correlate the data at a relatively higher concentration of solid particles.
