水中で鉛直上向きに射出した固体球の運動に及ぼす一軸貫通孔の初期角度の影響

抄録

A sphere with a uniaxial through-hole of 6mm with a sphere diameter of 25.4 mm and density of 1360 kg/m³ was launched vertically upward toward the free surface of calm water. The effect of initial angle of the uniaxial through-hole was investigated from the time the sphere passed through the calm water surface until it attained its maximum displacement position. When uniaxial through-hole of the sphere and the water surface are horizontal, a slight rotation occurs in the sphere that rises in the water. As the initial angle of the uniaxial through-hole increases, the sphere over the water surface deviates greatly from the central axis.