Numerical and experimental study of bubble entrainment due to a horizontal plunging jet
Numerical and experimental study of bubble entrainment due to a horizontal plunging jet
复制标题
水平切入射流气泡夹带的数值与实验研究
DOI：
10.3233/isp-130093
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发表时间：
2013
影响因子：
0.8
通讯作者：
G. Chahine
中科院分区：
文献类型：
--
作者：
C. Hsiao;Xinguo Wu;Jingsen Ma;G. Chahine
通过数值和实验研究了由于静止和移动的水平射流冲入静止液体而导致的自由表面破坏、气泡夹带以及由此产生的气泡尾流。移动射流尾流表现出与静止射流尾流显着不同的流动特性。高速视频显示，水平急流射流周期性地产生带有截留空气的大型旋涡结构。当每个涡旋气穴返回自由表面并向下游移动时，由于局部剪切流而破裂成多个气泡。分析了气穴出现的频率，发现其与切入射流和几何条件成比例。采用欧拉/拉格朗日单向耦合两相流模型模拟了坠落动力学，该模型包括水平集方法和亚网格气泡夹带模型。这些捕获了自由表面动力学并预测了气泡的产生和夹带。数值模型很好地捕捉了暴跌区域附近的流动结构、速度场和整体气泡扩散区域。由于单向耦合不能正确考虑有效密度，因此正在通过两相之间的双向耦合寻求对下游尾流的进一步改进。
Free surface disruption, bubble entrainment, and resulting bubbly wake due to a stationary and moving horizontal jets plunging into a quiescent liquid were studied both numerically and experimentally. The moving jet wake showed significantly different flow characteristics than the stationary jet wake. High speed videos revealed that large vortical structures with entrapped air were generated periodically from the horizontal plunging jet. Each vortical air pocket broke up into multiple bubbles due to local shear flows as it returned toward the free surface and moved downstream. The frequency of the air pocket occurrence was analyzed and found to scale with the plunging jet flow and geometry conditions. The plunging dynamics was simulated with an Eulerian/Lagrangian one-way coupled two-phase flow model, which included a Level-Set method and a sub-grid bubble entrainment model. These captured free surface dynamics and predicted the bubble generation and entrainment. The flow structures, velocity field, and overall bubble spreading region near the plunging region were well captured by the numerical model. Further improvement on downstream wake flow is being sought through two-way coupling between the two phases since the one-way coupling does not account properly for the effective density.
影响因子：
4.1
作者：
LAFAURIE, B;NARDONE, C;ZANETTI, G
通讯作者：
ZANETTI, G
影响因子：
4.1
作者：
ROE, PL
通讯作者：
ROE, PL