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Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid 4 He at High Temperature

Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid 4 He at High Temperature,10.1007/s10909-010-0277-1,Journal

Time-of-Flight Experiments of Vortex Rings Propagating from Turbulent Region of Superfluid 4 He at High Temperature  
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We report the time-of-flight of quantized vortex rings generated by a vibrating wire in superfluid 4He which contains normal fluid component. A cover box of vibrating wires and slow cooling of superfluid reduce the number of vortices attached to wire surfaces, enabling us to study vortex rings propagating from a turbulent region. Using two vibrating wires as a generator and a detector of vortices, the time-of-flight of vortices propagating a distance of 0.88 mm was measured at 1.25 K. We find that the time-of-flights distribute from 0.06 s to 27.4 s, much larger than the lifetimes of circular vortex rings limited in the size of a generator amplitude. These results imply that large vortex rings with non-circular shape or vortex tangles are created by the generator, propagating slowly and colliding with the detector before complete disappearance.
Journal: Journal of Low Temperature Physics - J LOW TEMP PHYS , vol. 162, no. 3, pp. 322-328, 2011
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