The interaction between the oscillating jet and the wedge produces a fluctuating flow field outside the jet which in turn affects the motion of the jet. However, microscopic evidence of these phenomena remains undisclosed. In the present study, an optical system-operated PIV technique was employed to obtain the time-wise variations of both the velocity-vector and vorticity distributions. With the aid of LDV measurements, the Reynolds stress and power spectral distributions were also acquired. In conclusion, the micro PIV measurements have for the first time disclosed the location and flow process characteristics of the edge-tone source. In addition, the micro flow behavior of reciprocating migration of the conjunct separation vortex pair over the rear edge of the third-row cylinder is confirmed as the mechanism of flip-flow oscillations induced by the edge tone phenomenon.
A uniform plating system useful in a chemical plating industry has been developed. For plating of tubes, uniform plating thickness has been achieved. The demands of a plating industry such as an uniform thickness plating and the gap plating between two parts were crucial. The development of new plating system was based on fluid dynamic control using flip-flop flows. Small swirls produced by flip-flop flows would give thorough mixing of liquid and take away the phenomenon that wakes behind tubes occur. For clarifying these phenomena, the velocity variations in a plating tank were measured using two-dimensional PIV. Basic experiments using flip-flop flows, conventional flows and jet flows were performed.
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