エアリフトポンプによる固体粒子の輸送特性 (第1報)
1981 年 97 巻 1118 号 p. 245-250,262
詳細
1981 年 97 巻 1118 号 p. 245-250,262
The authors achieved experimental studies on the influence of various factors such as pipediameter (D), pipe inclination (θ), pipe length (L), physical properties of solids and conveying fluid etc. on lifting capability and efficiency, and also tried to develop a practical calculation method for lifting volume in both two phase and three phase flow, based on the studies of Kawashima and Noda et al of Tohoku Univ.
The results are summarized as follows.
(1) The bentonite water (II)(γm=1030kg/m) showed a higher lifted volume of solids compared to pure water, especially in inclined pipe (θ=50°).
(2) The basic data in two phase flow were satisfactorily arranged by the relation between 1-fL2 (X)/σ3/5 and Vgo/√2gL which was presented by Kawashima et al, considering the specific volume of conveying fluid. Consequently, the calculated values for lifting volume of liquid agreed well with the experimental values.
(3) Concerning three phase flow, the following empirical equation was obtained between the averaged volumetric ratio of liquid fL2 (x) in two phase flow and that of liquid-solid fL3 (X') in three phase flow.
fL3 (X')/fL2 (X) = {1-0.094 (ds/D)-0.02} Frg0.031 (DS/D)-0.20 {1+α(154.32β+1.79)}/1-Cv (γs/γm-1)
Here,
α=1-2θ/π, β=γm/γω(γm/γω-1)
Consequently, our experimental results agreed approximately with, the calculated values obtained by the aboved equation, in pract i cal range.(4) The lifting efficiency of liquid and solids was calculated from the experimental results. As a result, the lifting efficiency for liquid was 50-60% and that for solids 8-12% in maximum.
