Liquid Atomization Phenomena Based on Laminar-Turbulent Transition of a Radial Liquid Sheet

基于径向液体层层流-湍流转变的液体雾化现象

• 批准号: 14350096
• 负责人: AZUMA Tsuneo
• 金额: $ 4.61万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350096/
• 关键词: Radial liquid sheet; Laminar-turbulent transition; Liquid atomization; Disturbance; Instability; Surface tension; Flow visualization; 撹乱; かく乱

Perforations caused by a laminar-tubulent transition of a radial liquid sheet are described. A liquid film produced by a impingement of liquid to a disk center spreads out radially on the disk and forms a radial liquid sheet outside the disk edge. The radial liquid sheet is unstable because of an internal velocity profile with an inflexional point. The instability causes a laminar-turbulent transition just outside the disk edge and the taransition leads to strong tubulence. Flow patterns completely depend on the frequency of perforations produced by the strong turbulence. The countless perforations lead to atomization of the liquid sheet. and no perforation results in a smooth liquid sheet. The perforation frequency relys on the configurations of streaky aggregations produced by fine waves after the transition. The wavy short aggregations induce the countless perforations and atomization immediately after the transition. The perforation frequency also relys on liquid properties and temperture of ambient gas. Chemical properties of the liquid sustaning a very thin liquid sheet like a soap bubble suppress the perforation and hot ambient air promotes the perforation.

描述了径向液膜的层流-湍流过渡引起的穿孔。由液体冲击到盘中心产生的液膜在盘上径向地展开，并且在盘边缘外部形成径向液体片。径向液膜是不稳定的，因为内部速度分布有一个椭圆点。这种不稳定性在盘边缘外引起层流-湍流转变，这种转变导致强湍流。流型完全取决于强湍流产生的穿孔频率。无数的穿孔导致液体片的雾化。并且没有穿孔导致光滑的液体层。穿透频率取决于相变后细波产生的条纹状聚集体的形状。波状短聚集体在相变后立即引起无数穿孔和雾化。射孔频率还与液体性质和环境气体温度有关。液体的化学性质维持一个非常薄的液体片，如肥皂泡抑制穿孔和热的环境空气促进穿孔。

项目成果

Growth of Disturbance Wave Induced by Instability of a Radial Liquid Sheet

径向液层不稳定性引起的扰动波的增长

• 发表时间: 2004
• 期刊: Trans.Japan Soc.Mech.Eng., Ser.B 70-698
• 作者: WAKIMOTO;T.;AZUMA;T.
• 通讯作者: T.

放射状自由液膜流れの不安定性によるかく乱波の増幅

由于径向自由液膜流的不稳定性而导致扰动波的放大

• 发表时间: 2004
• 期刊: 日本機械学会論文集B編 70・698
• 作者: 脇本辰郎;東 恒雄
• 通讯作者: 東 恒雄

Observation and Simulation of a Tollmien-Schlichting Wave Packet Produced in a Radial Liquid Film Flow

径向液膜流中产生的Tollmien-Schlichting波包的观测与模拟

• 发表时间: 2007
• 期刊: Trans.Japan Soc.Mech.Eng., Ser.B 73-727
• 作者: MARUYAMA;K.;AZUMA;T.
• 通讯作者: T.

Growth of Disturbance Wave Induced by Radial Liquid Sheet Instability

径向液层不稳定性引起的扰动波的增长

• 发表时间: 2006
• 期刊: JSME International Journal, Series B 49-4
• 作者: WAKIMOTO;T.;AZUMA;T.
• 通讯作者: T.

Effect of Surfactant Additives on the Transition in Pipe Flow

表面活性剂添加剂对管流转变的影响

• 发表时间: 2006
• 期刊: Trans.Japan Soc.Mech.Eng., Ser.B 72-717
• 作者: ARAGA;K.;AZUMA;T.
• 通讯作者: T.