Abstract
Flow visualization experiments were conducted to clarify 3D vortex structure of the vortex streets in the wake of a circular cylinder. The cylinder was towed in a liner salt stratification fluid or in a homogeneous fluid filled in a translucent tank. Main observation of the flows was made for the streaklines visualized by fluorescent dye issuing from the surface of the cylinder. The patterns depicted by the streaklines are intimately related to the vortex structure since the vorticities are generated only on the surface of the cylinder. Three-dimensional streakline patterns contain excess information to understand the vortex structure. Based on Taylor hypothesis we propose the procedures to compose a 3D image or a superposed image rendering the concise vortex structure from a series of video pictures of the streaklines passing through the cross section of the wake. The stratification effects on the vortex structure observed in a homogeneous fluid were investigated with the 3D images and the superposed images as well as the video pictures of the flows.
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