エアリフトポンプによる固体粒子の水力輸送 (第2報)

抄録

In the case of transportation of solids by airlift pump in the deep sea mining and the dredging, it may be considered that the pipelines incline because of the tide and the waves.
The studies on hydraulic transport of solids by airlift pump are very few, and then the studies for investigating the influence of pipe inclination on transportation of solids by airlift pump are overlooked.
The purpose of this paper is to find the influence of pipe inclination on the characteristics of airlift pump at the transportation of solids, and as the basic research for that study, authors investigated the relation between holdup of water in pipe and an angle of inclination (θ) at two and three phase flow by airlift pump.
Main results obtained are summarized as follows:
1.In the case of two phase flow by airlift pump;a._??_θ: radian
2. In the case of three phase flow by airlift pump;d._??_
Where _??_ f_L, f_G=volume fraction of water andair in pipe,
Q_g0, Ql, Q_s=vorume flow rate of air, water and solids,
V_g0=apparent velocity of air at atmospheric pressure,
V_b=velocity of air in pipe, X=friction loss parameter, Δp_f=friction loss.