Abstract
Growth process and three-dimensional deformation process of the disturbance wave, which appears in the laminar-turbulent transition process of a radial liquid sheet flow, are clarified. The radial liquid sheet is formed by the release of a radial liquid-film flowing on a disk from the edge of the disk to still air. When the Reynolds number is large, a concentric disturbance wave ('D wave') appears and grows downstream on free surfaces of the liquid sheet. 'D wave' is caused by the unstable disturbance, which is attributable to the inflectional velocity distribution of the liquid sheet. After the growth and the three-dimensional deformation of 'D wave', a laminar-turbulent transition occurs. The detail observation and amplitude measurement of 'D wave', which is excited by supersonic wave, reveal growth process and three-dimensional deformation process of the 'D wave'.
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