Entrainment and transport of air bubbles by vortex ring

涡环对气泡的夹带和输送

• 批准号: 22560163
• 负责人: UCHIYAMA Tomomi
• 金额: $ 2.66万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560163/
• 关键词: 渦輪; 混相流; 気泡; 気液二相流; 気泡プルーム; 可視化; 数値解析

The entrainment and transport of air bubbles by a vortex ring are experimentally investigated. A vortex ring launcher, composed of a cylinder and a piston, is mounted on the bottom of a water tank. The cylinder diameter D0 and the piston stroke L0 are 42.5 mm and 100 mm respectively. The launched vortex ring, of which circulation is less than 20000, is of a laminar type. Air bubbles are injected from a needle, which is attached on the cylinder surface, into the vortex ring. The mean bubble diameter is 3.2 mm. The bubble motions relative to the vortex ring are found to be classified according to the strength of the vortex ring and the bubble flow rate. When the strength of the vortex ring is low, the bubbles are less affected by the vortex ring. With increasing the strength, the bubbles are favorably entrained into the vortex ring. The entrained bubbles distribute around the center of the vortex core. They are transported by the vortex ring when the strength of the vortex ring is large. The entrained bubbles hardly change the convection of the vortex ring. The radius of the vortex ring becomes larger at the position where a number of bubbles are entrained.

通过实验研究了涡环对气泡的夹带和传输。涡环发射器由气缸和活塞组成，安装在水箱底部。气缸直径D0和活塞行程L0分别为42.5mm和100mm。发射的涡环为层流型，流通量小于20000。气泡从附着在圆柱体表面的针注入涡流环。平均气泡直径为3.2毫米。发现气泡相对于涡环的运动可根据涡环的强度和气泡流速进行分类。当涡环的强度较低时，气泡受涡环的影响较小。随着强度的增加，气泡有利地被夹带到涡环中。夹带的气泡分布在涡核中心周围。当涡环强度较大时，它们由涡环输送。夹带的气泡几乎不改变涡环的对流。在夹带大量气泡的位置，涡环的半径变大。

项目成果

Vortex Simulation for Dispersed Gas-Liquid Two-Phase Flows

分散气液两相流的涡流模拟

• 发表时间: 2010
• 作者: Uchiyama;T.;Kusamichi;S.;Degawa;T.;内山知実;Tomomi Uchiyama
• 通讯作者: Tomomi Uchiyama

気泡プルームの内部に射出された渦輪と気泡の相互作用

涡环与注入气泡羽流中的气泡之间的相互作用

• 发表时间: 2011
• 作者: Mizukaki;T. and Takayama;K.;Shock;内山知実・草道聡;内山知実;Tomomi Uchiyama;Tomomi Uchiyama;内山知実
• 通讯作者: 内山知実

渦輪による気泡群の巻込みと輸送の渦法シミュレーション

涡流法模拟涡环夹带和传输气泡

• 发表时间: 2010
• 作者: Uchiyama;T.;Kusamichi;S.;Degawa;T.;内山知実
• 通讯作者: 内山知実

Interaction of Bubbles with a Vortex Ring Launched into Bubble Plume

气泡与射入气泡羽流的涡环的相互作用

• 发表时间: 2011
• 作者: Mizukaki;T. and Takayama;K.;Shock;内山知実・草道聡;内山知実;Tomomi Uchiyama
• 通讯作者: Tomomi Uchiyama

Numerical Simulation of Interaction between a Vortex Ring and Gas Bubbles

涡环与气泡相互作用的数值模拟

• 发表时间: 2011
• 作者: Mizukaki;T. and Takayama;K.;Shock;内山知実・草道聡;内山知実;Tomomi Uchiyama;Tomomi Uchiyama
• 通讯作者: Tomomi Uchiyama