Experiment and Performance Prediction of Bubble-Jet Type Air-Lift Pump for Dredging Sediments on Sea and Lake Beads

摘要

Sadatomi invented a bubble-jet-type air-lift pump for dredging sediments deposited on sea and lake beds by striking water jet with air bubbles. In our previous study [6], experiments were conducted using 50 mm I.D. and 5.0 m long pipe as the upriser of the pump, three kinds of spherical particles of different size and density as the test particle, and 3.0 wt % saltwater as the test liquid. In addition, the submergence ratio, the ratio of the upriser length submerged in water to the total length, was changed from 0.76 to 0.84. Furthermore, Yoshinaga et al.'s model for predicting pump performance was modified and validated by the experimental data reported so far by the authors. In the present paper, new simulation results for designing larger system is described together with a summary of the previous study [6].