Anomalous Motion of a Sphere Falling through Water

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概要

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• A pendulum motion of a sphere falling through water under the action ofgravity was studied experimentally for the Reynolds number between 1.5 x 10'and 4.0 x 10', and its explanation is given. The quantitative analysis of the pathwith stereoscopic photographs showed that the bending of the path from thevertical line occured through the action of a side force I, acting perpendicularly tothe path and alternating its direction with a frequency whose Strouhal numberwas about 0.2. Visual observation with a VIDEO revealed th'at the force L arosefrom a circulating flow around the sphere, which was generated and alternatedits sense of rotation by shedding asymmetric vortex loops from alternate sidesof the sphere. The lift coefficient was found to be about 0.3. The drag coefficientincreased from 0.4 to 0.9 when the circulating flow reversed.

• 社団法人日本物理学会の論文
• 1983-10-15

著者

• Kuwabara Goro

  Hyogo University Of Teacher Education

• Kono Kimitoshi

  Hyogo University Of Teacher Education

• CHIBA Seiji

  Hyogo University of Teacher Education

関連論文

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• Anomalous Motion of a Sphere Falling through Water
• Splash Produced by a Smooth Sphere or Circular Cylinder Striking a Liquid Surface
• Restitution Coefficient in a Collision between Two Spheres
• Experimental Study on Coupled Plasmon-Ripplon Resonances and the Debye-Waller Factor of the Wigner Crystal

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