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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The shape and motion of gas bubbles in a liquid flowing through a thin annulus
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - The shape and motion of gas bubbles in a liquid flowing through a thin annulus

机译：APS-APS流体动力学分部第70届年会-事件-流过细环空的液体中气泡的形状和运动

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摘要

We study the shape and motion of gas bubbles in a liquid flowing through a horizontal or slightly-inclined thin annulus. Experimental data show that in the horizontal annulus, bubbles develop a unique “tadpole” shape with an elliptical cap and a highly-stretched tail, due to the confinement between the closely-spaced channel walls. As the annulus is inclined, the bubble tail tends to decrease in length, while the geometry of the cap remains almost invariant. To model the bubble evolution, the thin annulus is conceptualised as a ``Hele-Shaw” cell in a curvilinear space. The three-dimensional flow within the cell is represented by a gap-averaged, two-dimensional model constrained by the same dimensionless quantities. The complex bubble dynamics are solved using a mixed control-volume finite-element method combined with interface-capturing and mesh adaptation techniques. A close match to the experimental data is achieved, both qualitatively and quantitatively, by the numerical simulations. The mechanism for the elliptical cap formation is interpreted based on an analogous irrotational flow field around a circular cylinder. The shape regimes of bubbles flowing through the thin annulus are further explored based on the simulation results.
机译：我们研究了在水平或略微倾斜的薄环空中流动的液体中气泡的形状和运动。实验数据表明，由于在狭窄通道壁之间的限制，气泡在水平环上形成了独特的“ ta”形，带有椭圆形的帽盖和高度伸展的尾巴。当环面倾斜时，气泡尾部的长度趋于减小，而瓶盖的几何形状几乎保持不变。为了模拟气泡的演化，细环被概念化为曲线空间中的``Hele-Shaw''细胞。单元内的三维流动由间隙平均的二维模型表示，该模型受相同的无量纲量约束。复杂的气泡动力学是使用混合控制量有限元方法与界面捕获和网格自适应技术相结合来解决的。通过数值模拟，从质量和数量上都与实验数据非常接近。基于圆柱体周围类似的非旋转流场来解释形成椭圆形帽的机理。根据模拟结果，进一步探讨了流经细环空的气泡的形状。

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