The Radial Flow of a Thin Liquid Film : 5th Report, Influence of Wall Roughness on Laminar-turbulent Transition
The Radial Flow of a Thin Liquid Film : 5th Report, Influence of Wall Roughness on Laminar-turbulent Transition
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薄液膜的径向流动：第五次报告，壁粗糙度对层流-湍流转变的影响
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
Tatsuroh Hoshino
中科院分区：
文献类型：
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作者：
T. Azuma;Tatsuroh Hoshino
本文描述了液体薄膜径向流动中壁面粗糙度对层流向湍流过渡的影响。利用以下三种分布粗糙度直观地观察了液体表面的性质；(A)锯齿形粗糙度和(B)梯形粗糙度，两者都有规律地以同心结构构造；(C)不规则分布的砂粒粗糙度。研究发现，在其他条件相同的情况下，随着壁面粗糙度高度的增加，过渡点会向上游移动，并且在(1)停滞区、(2)层流边界层生长区和(3)全流为层流边界层的区域均会发生过渡。此外，实验结果表明，临界雷诺数随着壁面粗糙度高度的增加而降低。
This paper describes the influence of wall roughness on the transition from laminar to turbulent flow occurring in the radial flow of a thin liquid film. The properties of liquid surface was visually observed using the following three types of distributed roughnesses; (A) saw-toothed roughness and (B) trapezoidal shaped roughness, both of which were regularly constructed in a concentric configuration; and (C) irregularly distributed sand roughness. It was found that the point of transition shifted upstream as the height of wall roughness increased under otherwise identical conditions, and that the transition occurred in each of the three regions, namely, (1) the stagnant region, (2) the region in which the laminar boundary layer grows, and (3) the region in which the whole flow is the laminar boundary layer. Furthermore, experimental results showed that the critical Reynolds number decreased as the height of wall roughness increased.