有孔物体の付加質量

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It is important to determine the added mass of objects in order to estimate the hydrodynamic force on floating fisheries banks. The following is a report on experimental results obtained for the added masses of porous objects. The apparatus used in this experiment is essentially a torsion pendulum. The values of added masses are calculated from the difference between the periods of this pendulum in water and in alr. Objects used in tllis experiment were porous circular pipes, a porous hollow sphere, and a porous hollow double circular cone. Holes varying in radius (r) were drilled into circular pipes of various diameters (D) with varying distances (a) between the holes. Holes were also drilled into a hollow sphere and a circular cone. Radiuses of the holes were gradually decreased in size near the tops of both the sphere and the cone. We were able to determine the added masses of these porous objects. Using porosity and a parameter:√a•r/D, we were also able to estimate the added masses of other porous objects of arbitrazy shapes.
日本水産學會の論文