Laminar-Turbulent Transition in a Free Liquid Film Flow and its Application to the Atomization

自由液膜流中的层流-湍流转变及其在雾化中的应用

• 批准号: 61550135
• 负责人: AZUMA Tsuneo
• 金额: $ 1.22万
• 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: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550135/
• 关键词: Boundary layer; Laminar-turbulent transition; Liquid film flow; Rotating disk; Atomization; LDV measurement; 流れの安定性; 放射状液膜流れ; レーザ・ドップラー流速計; 微粒化; 自由液膜流れ; LDV流速計; 臨界レイノルズ数

1. The laminar-turbulent transition in the radial flow of a free liquid film is studied experimentally and theoretically. The flow is generated by making a thin radial liquid film along a horizontally placed circular disk and letting it flow out into the atmosphere. The transition mechanism is observed using a stroboscope. The velocity distributions in a thin free liquid film having a thickness of about 0.2 mm are measured by LDV. The phenomena of the transition is investigated by means of the linear stability theory. As a result, the transition is caused on the nonuniformity of the vorticity distribution inside the liquid film. 2. The laminar-turbulent transition in the radial liquid film flow on a rotating disk is studied experimentally. The flow is generated by letting water discharge from a cylindrical opening between a horizontally placed rotating disk and a circular nozzle into the atmosphere along the upper surface of the disk. The high speed photographes of the process of the transition show that, while the rotation of disk suppresses the transition as long as the circumferencial velocity is relatively small to the radial velocity, it promotes the transition when the circumferencial velocity becomes large.

1. 从实验和理论上研究了自由液膜径向流动中的层流-湍流转变。这种流动是通过沿着水平放置的圆盘形成一层薄薄的径向液膜并让它流入大气中而产生的。使用频闪仪观察转变机制。通过LDV测量厚度约为0.2mm的薄自由液膜中的速度分布。利用线性稳定性理论研究了转变现象。结果，液膜内部涡量分布的不均匀性引起转变。 2. 对旋转盘上径向液膜流的层流-湍流转变进行了实验研究。通过让水从水平放置的旋转盘和圆形喷嘴之间的圆柱形开口沿着盘的上表面排放到大气中来产生流动。转变过程的高速照片表明，当圆周速度相对于径向速度较小时，圆盘的旋转会抑制转变，而当圆周速度变大时，圆盘的旋转会促进转变。

项目成果

東 恒雄: 日本機械学会論文集. 54,B編. 361-366 (1988)

Tsuneo Higashi：日本机械工程师学会会议录，54，B 版（1988 年）。

東恒雄: 日本機械学会論文集.

Tsuneo Higashi：日本机械工程师学会会议录。

AZUMA, Tsuneo: "Laminar-Turbulent Transition in a Radial Free Liquid Film Flow (1st Report, Velocity Distribution)" Trans. Japan Soc. Mech. Engrs.53-491B. 2007-2014 (1987)

AZUMA，Tsuneo：“径向自由液膜流中的层流-湍流转变（第一份报告，速度分布）”Trans。

東 恒雄: 日本機械学会創立90周年記念関西支部第247回講演会講演概要集. No.874ー3. 22-23 (1987)

东恒夫：纪念日本机械工程师学会成立 90 周年第 247 届关西分会讲座摘要第 874-3 号（1987 年）。

AZUMA, Tsuneo: "Laminar-Turbulent Transition in a Radial Free Liquid Film Flow (3st Report, Velocity Measurements on Transition from Laminar to Turbulent Flow)" Trans. Japan Soc. Mech. Engrs.54-498B. 361-366 (1988)

AZUMA，Tsuneo：“径向自由液膜流中的层流-湍流转变（第三次报告，从层流到湍流流转变的速度测量）”Trans。