A233 放射状自由液膜流の微粒化過程における LDV 計測

概要

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Disintegration process of radial liquid sheet flow is cralified by LDV measurement of the flow. The radial liquid sheet is generated by a water discharge through a small gap formed between the end of a nozzle and the flat surface of a disk. The liquid film flow spreads radially outward on the disk, flowing from the edge of the disk into the air as a liquid sheet. Sudden laminar-turbulent transition occurs in the liquid sheet when the Reynolds number exceeds a critical value. Perforations are observed in the liquid sheet over the almost same Reynolds number. These perforations grow rapidly and ligaments are produced along the borders of perforations. These ligaments finally break up into drops. In this study, the photograph of the feature of the liquid sheet is taken by a camera, flow velocity is measured by LDV and the existence of the perforation at a LDV measuring volume is detect by a photo-sensor. The velocity data measured by syncronized operations of the camera, LDV and the photo-sensor are classified into the velocities of sheets, perforations, ligaments and drops.
日本流体力学会の論文
2000-07-25