Abstract
The cyclic vortex rings, which are generated cyclically by a pulsating jet, appear to be an effective method for particles and fluids transport. The effect of the formation conditions of cyclic vortex rings such as the velocity amplitude, period and acceleration of jet pulsation conditions, and conditions of an intermittent period, on the axis symmetry characteristics of behavior of vortex rings is investigated experimentally. The results indicate that the axis symmetry characteristics of cyclic vortex rings begin to decay by the following four factors, the influence of a separation vortex ring, the influence of trailing vortex rings, the influence of a previous cyclic vortex ring and the influence of trailing vortex rings. The strength of these decay inducing factors varies with the formation conditions of cyclic vortex rings. The behavior of cyclic vortex rings is determined by the combination and individual strength of decay factors.
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