ねじれ形速度分布を有する放射状自由液膜流の乱流遷移に関する研究 : 第1報,層流速度分布

概要

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The aim of the present study is to show that a sudden transition from laminar to turbulent flow due to nonuniformity of vorticity occurs in a radial free liquid-film flow having a axisymmetrically twisted velocity distribution. In the first report, the velocity distribution of the laminar flow is described. This flow was generated by releasing a thin liquid film on the upper surface of a rotating disk into the atmosphere. The velocity distribution in the flow was measured using a laser Doppler velocimeter. In a theoretical treatment, a similarity-type transformation in conjunction with a stream function was applied to appropriate nonsimilar boundary-layer equations. The final theoretical equations were solved numerically by means of the finite difference method. The experimental data were in good agreement with the calculated results, showing that a three-dimensional boundary-layer-type velocity profile at the end of the rotating disk gradually becomes uniform in the down-stream direction.
一般社団法人日本機械学会の論文
1993-10-25