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Instability wave motion of the liquid film jet in a high speed co-current uniform gas stream was investigated experimentally an theoretically. The following results were obtained. The instability waves arose in both the flow direction and a perpendicular direction to it, and these waves have approximately the same wave number. Examination of the linear Kelvin-Helmholtz instability and the liquid film energy made it clear that the wave numbers of the instability waves agreed well with experimental results. It was found that the wave number of the liquid film jet could be estimated by a theoretical analysis. A close relation of the wave frequency to the liquid film breakdown was confirmed experimentally.
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Arai et al. (1985) studied this question.
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