WAKE METAMORPHISM BEHIND A SPHERE

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Abstract
The formation of a vortex ring on the immediate downstream side of an accelerating liquid sphere has been examined. The manner in which vorticity is transferred to the axisymmetric ring has been deduced from photographs of the sheet as it curls inward. Measurements of the distance moved by the open end of the sheet relative to the displacement of the sphere indicate the sheet length to be about 20% of the distance travelled by the sphere. The ratio of the distances gives the relative velocity of the sphere and the sheet. The former is relative to the quiescent ambient fluid and the latter to the sphere. A sequence of photographs is shown, indicating changes in the wake configuration from the beginning of motion to the ejection of the initial-vortex element.

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