放射状自由液膜流れの乱流遷移に関する研究 : 第3報, 乱流遷移が生じる場合の速度分布

放射状自由液膜流れの乱流遷移に関する研究 : 第3報, 乱流遷移が生じる場合の速度分布
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径向自由液膜流中的湍流转变研究:第三次报告,发生湍流转变时的速度分布

DOI:
10.1299/kikaib.54.361
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发表时间:
1988
期刊:
Transactions of the Japan Society of Mechanical Engineers. B
影响因子:
--
通讯作者:
直正 森島
直正 森島
中科院分区:
--
文献类型:
--
作者:
恒雄 東;直正 森島

文献摘要

被引文献

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研究了自由液膜径向流动中的层流-湍流转变。液膜流的产生方式与之前的论文相同。当基于液体表面速度和盘边缘处的膜厚度的雷诺数较高时,从层流到湍流的转变发生在盘边缘下游几毫米处。通过LDV来考察转捩过程中速度分布的变化。发现由于非常小的涡流的出现而引起的径向速度分量的减小从盘边缘下游几毫米处的液膜的较高速度侧开始,此后速度分布立即变得均匀。
The laminar-turbulent transition in the radial flow of a free liquid film is studied. The liquid film flow is generated in the same way as in the previous papers. When the Reynolds number which is based on the liquid surface velocity and the film thickness at the disk edge is high, the transition from laminar to turbulent flow takes place several millimeters downstream of the disk edge. The change of the velocity distribution in the process of the transition is examined by LDV. It is found that the reduction of the radial velocity component due to the occurrence of very small vortices starts at the higher velocity side of the liquid film a few millimeters downstream of the disk edge, and thereafter the velocity distribution becomes uniform immediately.