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Plenary Lecture

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

Professor Michio Sadatomi
Advanced Mechanical System Department
Graduate School of Science and Technology
Kumamoto University, Kurokami-2-39-1
Kumamoto City, 860-8555, Japan
E-mail: sadatomi@mech.kumamoto-u.ac.jp

Abstract: The bubble-jet-type air-lift pump was invented by Sadatomi in order to dredging sediments deposited on sea and lake beds by striking water jet with air bubbles. In the present paper, the performance of the pump has been reported. In the experiments, 50 mm I.D. and 5.0 m long pipe was used as an upriser of the pump. The test sediments were three kinds of spherical particles of different size and density, while the test liquid was 3.0 wt % saltwater in view of the usage in sea. The submergence ratio i.e., the ratio of the upriser length submerged in water to the total upriser length, was changed from 0.76 to 0.84, and the air supply rate to the upriser was changed up to 250 l/min while the water rate to the bubble-jet-generator was fixed at 72.0 l/min. In the analysis, Yoshinaga et al.’s model for predicting discharge rates of water and particles was modified by incorporating a correlation of particles flow rate fraction in water-particles mixture. The modified model could predict well the present data at an efficient pump operation condition irrespective of the differences in the salinity, the particles specifications and the submergence ratio.

Brief Biography of the Speaker: Michio Sadatomi graduated from Kumamoto University, Japan in 1974, and took Doctor of Engineering from Kyushu University in 1986. He became an Associate Professor of Kumamoto University in 1988, and studied at University of Toronto, Canada, as an International Fellowship Researcher in 1990-91, and became a Professor of Kumamoto University in 1998. His specialty is mechanics of fluids, especially thermal hydraulics of multiphase systems. He became a Fellow of the Japan Society for Mechanical Engineering in 2007, and worked as the Lead Organizer of 12th International Symposium on Gas-Liquid Two-Phase Flows in ASME-JSME-KSME Joint Fluids Engineering Conference in 2011. Now, he works as the Chair of 6th Japanese-European Two-Phase Flow Group Meeting (November 23-27/2012) and as the President of the Japanese Society for Multiphase Flow.

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