Transition in a Free Liquid Film Flow Generated by a Rotating Disk

旋转盘产生的自由液膜流的转变

• 批准号: 01550156
• 负责人: AZUMA Tsuneo
• 金额: $ 1.02万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550156/
• 关键词: Laminar-Turbulent Transition; Boundary Layer; Stability; Radial Flow; Liquid Film Flow; LDV Measurement; Polymer Additives

1. The transition from laminar to turbulent flow in a radial liquid film flow on a rotating disk is studied experimentally and theoretically. LDV measurements on the laminar flow clarified that a three-dimensional boundary layer grows gradually in the downstream direction and finally the entire flow merges into a three-dimensional boundary layer. High speed photography elucidated that the transition occurs owing to the amplification of the disturbance existing in the vicinity of the disk surface. The experimental results showed that the rotation of the disk suppresses the transition when the effect of the rotation of the disk on the flow is small, whereas the rotation promotes the transition when the effect is great. The linear stability of the flow was analyzed, where the effects of Coriolis force and streamline curvature were taken into account. The results showed that the instability of the flow changes, with an increase of the effect of the disk rotation on the flow, from a viscous- to an inflectional-type. It was also shown that the weak three-dimensionality of velocity profiles causes the decrease of the amplification factor of disturbance, suppressing the transition accordingly, whereas the strong three-dimensionality promotes the transition because of the inflectional instability.2. The effect of polymer additives on the transition of the liquid film flow on a stationary disk was studied experimentally and theoretically. Experimental results showed that polymer additives shift the point of the transition upstream and decrease the critical Reynolds number although the mechanism of the transition is the same as that of the solvent. The linear stability was studied for the liquid film flow of the dilute polymer solution. Calculated results showed that the elasticity of liquid given by the polymer additives increases the instability of the flow.

1. 实验和理论研究了旋转圆盘径向液膜流由层流向湍流的转变。层流的LDV测量表明，三维边界层在下游方向逐渐增长，最终整个流动合并为三维边界层。高速摄影表明，这种转变是由于存在于圆盘表面附近的扰动放大而发生的。实验结果表明，当圆盘旋转对流量的影响较小时，圆盘的旋转抑制了过渡，而当圆盘旋转对流量的影响较大时，圆盘的旋转促进了过渡。考虑科氏力和流线曲率的影响，分析了流动的线性稳定性。结果表明，随着圆盘旋转对流动影响的增加，流动的不稳定性发生了变化，由粘性型转变为弯曲型。速度剖面的弱三维性导致扰动放大因子的减小，从而抑制了过渡，而强三维性则由于弯曲不稳定性而促进了过渡。实验和理论研究了聚合物添加剂对固定圆盘上液膜流动转变的影响。实验结果表明，聚合物添加剂使过渡点上移，降低了临界雷诺数，但过渡机理与溶剂相同。研究了稀聚合物溶液液膜流动的线性稳定性。计算结果表明，聚合物添加剂所赋予的液体弹性增加了流动的不稳定性。

项目成果

Tsuneo AZUMA: "Stability and Transition to Turbulence of Thin Liquid Film Flow Along a Rotating Disk" Proc.the lst Joint ASMEーJSME Fluids Engineering Conf.Symp.on Boundary Layer Stability and Transition to Turbulence. (1991)

Tsuneo AZUMA：“沿着旋转盘的薄液膜流的稳定性和湍流过渡”Proc.the lst Joint ASME-JSME Fluids Engineering Conf.Symp.on Boundary Layer Stability and Transition to Turbulence (1991)。

東 恒雄,薗田 由彦: "高分子微量添加による放射状液膜流れの乱流遷移促進(第1報,実験的研究)" 日本機械学会論文集(B編). 56ー524. 49-56 (1990)

Tsuneo Higashi、Yoshihiko Sonoda：“通过添加微量聚合物促进径向液膜流的湍流转变（第一份报告，实验研究）”日本机械工程师学会汇刊（编辑 B）49。 -56 (1990) )

東恒雄,布部誠: "回転円板に沿う放射状液膜流れの乱流遷移に関する研究(第2報、速度分布及び液膜厚さ)" 日本機械学会論文集(B編). 55-516. 2148-2155 (1989)

Tsuneo Higashi，Makoto Fube：“沿旋转盘径向液膜流的湍流转变的研究（第二次报告，速度分布和液膜厚度）”日本机械工程师学会会刊（B版）55-516 .2148。 -2155 (1989)

Tsuneo AZUMA: "Stability and Transition to Turbulence of Thin Liquid Film Flow Along a Rotating Disk" Proc. of the 1st Joint ASME-JSME Fluids Engineering Conf. , Symp. on Boundary Layer Stability and Transition to Turbulence. (1991)

Tsuneo AZUMA：“沿着旋转盘的薄液膜流的稳定性和湍流过渡”Proc。

Tsuneo AZUMA: "Stability and Transition to Turbulence of Thin Liquid Film Flow Along a Rotating Disk" Proc.the 1st Joint ASMEーJSME Fluids Engineering Conf.Symp.on Boundary Layer Stability and Transition to Turbulence. (1991)

Tsuneo AZUMA：“沿着旋转盘的薄液膜流的稳定性和湍流过渡”Proc.the 1st Joint ASME-JSME Fluids Engineering Conf.Symp.on Boundary Layer Stability and Transition to Turbulence (1991)。