U 】 trasound Velocity Proliler( UVP ) is applied to measuremen 亡 of two − dimensional velocity vector field of vortex rings in water , Thc instantaneous flow field passillg thr 〔 } ugh the measurement section is reconstructed from spatiQ − temporal distribution of velocity comp エ 〕nent obtained along two different ultrasound measurement lines . The method of reconstruction is valid when vQrtex ril】 gs have axisymmetric structure having constant translational verocity at the measurement sectiQn . Using this principle , vortex ring subject to background rotati n is also presented to discuss the effect of weak CoriolisfQrce en for 珥 ation process of vortex rhlgs . Key Motlts ; Vortex Ring , Background Retation , Ultrasound Velocity Profiler , Flow Visualization
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