Average particle velocity in solid-liquid two-phase flow through vertical and horizontal tubes.

概要

論文の詳細を見る
The concentration and velocity profiles of particles were measured for solid-liquid two-phase flow through vertical and horizontal tubes by a conventional photographic method, and through vertical tubes by two newly developed laser methods. Solid materials used were ion-exchange resin particles and glass beads with diameters of 321 to 1840 μm and densities of 1190 to 2500 kg/m3. Tube diameters were 1.92, 3.00, and 5.42cm. The average particle velocity, Up, calculated by the local values of particle concentration and velocity, was correlated with modified Froude number and particle Reynolds number based on the terminal settling velocity in a stagnant fluid with a standard deviation of 5.1 %: for vertical upflow, Up/(Us)av=exp(0.010 Re0.40p)-0.0059 Re0.69p[(Us)2av/{DTg(ρp/ρw-1)}]-1/2for horizontal flow, Up/(Us)av=exp(0.016 Re0.36p)-0.24 Re0.22p[(Us)2av/{DTg(ρp/ρw-1)}]-1/2 4<Rep<540, 2<(Us)2av/{DTg(ρp/ρw-1)}<120, md<0.05where (Us)av is average slurry velocity, DT is tube diameter, ρp and ρw are particle and liquid density, respectively, and md is delivered concentration of particles. The laser methods, one for the local concentration and the other for the local velocity, were successfully adopted as more convenient techniques for getting precise information on the behavior of particles than the conventional photographic method.
公益社団法人化学工学会の論文