垂直壁面附近单泡上升动力学研究

IF 3.8 2区 工程技术 Q1 MECHANICS
Zhen Jiang , Jiaojiao Guo , Zhen Jian
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引用次数: 0

摘要

气泡动力学是各种科学和工程领域的基础,从化学工程到环境科学。本文采用二维框架直接数值模拟的方法,研究了Hele-Shaw槽内粘性液体中靠近垂直壁面的单个气泡的上升动力学,研究了气泡大小和气泡与壁面的初始距离对气泡上升动力学的影响。确定了直线上升和之字形上升等不同的上升机理。结果表明,小气泡(D=0.5、1 mm)倾向于直线上升,大气泡(D=2、3、4、5 mm)倾向于锯齿状上升。气泡将从垂直壁面移开,要么回到垂直上升,要么在移开时触发一个更早的之字形。分析了气泡的水平和垂直速度、阻力系数和展弦比等特性,研究了气泡的涡旋动力学。气泡尾迹中旋涡对称性的丧失可能是造成之字形的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

On the dynamics of single bubble rising near a vertical wall

On the dynamics of single bubble rising near a vertical wall
Bubble dynamics are fundamental in various scientific and engineering fields, from chemical engineering to environmental science. Here, single bubble rising near a vertical wall in a viscous liquid in a Hele-Shaw cell was investigated through direct numerical simulations in a two-dimensional framework, and the effects of the bubble size and of the initial distance between the wall and the bubble on the rising dynamics were studied. Different rising mechanisms such as rectilinear rising and zigzagging were identified. It is revealed that small bubble (D=0.5,1 mm) prefers rectilinear rising, while larger bubble (D=2,3,4,5 mm) prefers zigzagging. The bubble will migrate away from the vertical wall, either turn back to vertical rising or trigger an earlier zigzagging as it migrates further away. Characteristics of the bubble, such as horizontal and vertical velocities, drag coefficient and aspect ratio were analyzed and the vortex dynamics were studied. The lost of symmetry of the vortices in the wake of the bubble could be responsible for the starting of zigzagging.
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来源期刊
CiteScore
7.30
自引率
10.50%
发文量
244
审稿时长
4 months
期刊介绍: The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others. The journal publishes full papers, brief communications and conference announcements.
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