Control of Jet Flow by Reciprocal Oscillating Flow

Investigation of the characteristics of the jet flow, issuing from a circular pipe and affected by the reciprocal oscillating flows, was addressed in this paper. These reciprocal flows issue from two circular pipes and have the contrary phase each other. Moreover, the net flow rate of the reciprocal flow is zero, respectively. The jet diffusion has been investigated by means of the flow visualization and the PIV analysis. As a result, it has been found that the jet diffusion is affected by these reciprocal oscillating flows largely and is enhanced considerably under the influence of these flows. Furthermore, it has been recognized that the jet flow tends to bifurcate clearly.