基于扩散界面法的较大气泡上升过程数值模拟

发布时间：2018-05-04 00:41

本文选题：较大气泡 + 扩散界面法　；参考：《原子能科学技术》2017年02期

【摘要】：基于扩散界面法和有限元法,对较大气泡在上升阶段的形态和速度进行了模拟,结果与实验吻合较好,说明该方法能准确地模拟气泡的运动特性。利用该模型,对初始直径不同的较大气泡上升过程中的形态、速度和振荡随时间变化的规律进行了分析。并分析了14mm直径的气泡在不同尺寸通道中上升过程的形态、速度的变化规律。结果表明:气泡的稳定形态随着气泡初始直径的增大由椭球形变为球帽形,且达到稳定形状的时间更长。气泡初始直径越大,气泡的顶端速度越快,并稍有波动。而气泡的底端速度开始快速增大使气泡向内凹陷,随后回落并在气泡顶端速度上下振荡。气泡上升通道越窄,气泡达到稳定形态的时间越长,顶端速度越小,气泡的高宽比越大。
[Abstract]:Based on the diffusion interface method and the finite element method, the shape and velocity of large bubbles in the rising stage are simulated. The results are in good agreement with the experimental results. It shows that this method can accurately simulate the motion characteristics of the bubbles. By using this model, the variation of shape, velocity and oscillation with time during the rising process of large bubbles with different initial diameters are analyzed. The shape and velocity of bubble rising in different size channels with 14mm diameter are analyzed. The results show that the stable shape of the bubble changes from ellipsoid to spherical cap with the increase of the initial diameter of the bubble, and the time of reaching the stable shape is longer. The larger the initial diameter of the bubble, the faster the top velocity of the bubble and slightly fluctuated. The velocity at the bottom of the bubble begins to increase rapidly, causing the bubble to sag inwards, then falls back and oscillates up and down at the top of the bubble. The narrower the bubble rising channel is, the longer the bubble reaches stable shape and the smaller the top velocity is, the larger the aspect ratio of bubble is.
【作者单位】：华南理工大学电力学院广东省能源高效洁净利用重点实验室;
【基金】：广东省科技项目资助(2014A010106012)
【分类号】：O359.1

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