壁面两浸没水平孔口气泡水平和垂直聚结的三维数值分析

Z. P. Li, L. Sun, X. Yao, Y. Piao
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引用次数: 0

摘要

在两个相邻浸没孔的起泡过程中,气泡不可避免地会聚。但是对孔内气泡的演化和相互作用的研究很少,特别是数值模拟的研究较少。本文结合网格平滑技术、网格细分技术以及轴对称聚结和三维聚结技术,采用边界元法建立了壁面上两个淹没相邻孔处气泡聚结的三维模型。然后,对分离前的水平和垂直聚结进行了数值模拟。最后,通过改变通风量和弗劳德数,研究了不同通风量和浮力对相邻两孔气泡聚并过程的影响。结果表明,对于水平聚结,通风量的影响比浮力的影响更明显。随着通风量的增大或浮力影响的减小,气泡内压波动幅度减小,聚并时间缩短。对于垂直聚结,浮力的影响比通风量的影响更明显。随着浮力影响的减小,垂直聚结时间增加,气泡内压减小。通风量的影响与水平聚结的影响相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-Dimensional Numerical Analysis of Horizontal and Vertical Coalescence of Bubbles at Two Submerged Horizontal Orifices on the Wall
In the process of bubbling from two submerged adjacent orifices, bubbles coalescence becomes inevitable. But the study of the evolution and interaction of bubbles from submerged orifices is little, especially numerical simulation. In this paper, combined with mesh smoothing technique, mesh subdivision technique and the technique of axisymmetric coalescence and 3D coalescence, a three-dimensional model of bubbles coalescence at two submerged adjacent orifices on the wall is established by the boundary element method. Then, numerical simulations were carried out for horizontal and vertical coalescence before detachment. Finally, by changing the ventilation rate and the Froude number, the effects of different ventilation rates and buoyancy on the process of bubbles coalescence at two adjacent orifices were investigated. The results show that for horizontal coalescence, the effect of ventilation rate is more pronounced than buoyancy. As the ventilation rate increases or the influence of buoyancy is decreased, the amplitude of internal pressure fluctuation of the bubble decreases and the coalescence time decreases. For vertical coalescence, the effect of buoyancy is more pronounced than ventilation rate. With the influence of buoyancy is decreased, the vertical coalescence time is increased, the internal pressure of the bubble is decreased. The influence of ventilation rate is similar to that of horizontal coalescence.
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