부산대학교 도서관

The flow around a sphere on a flat plate is investigated experimentally for the purpose of lifting the sphere by a suction flow from an inlet over the sphere. The experiments are carried out using air flow in the atmosphere. The lifting force exerted on the sphere is measured by using balances. The pressure on the surface of sphere is measured using pressure holes. The flow around the sphere is visualized using titanium tetrachloride and the tuft method. Several kinds of inlets are tested. It is concluded that the inlet of suction pipe with concentric annulus, which is composed of the outer pipe for jet flow and the inner pipe for suction flow, is suitable for lifting valuable mineral deposits on the ocean floor.