Non-axisymmetric instability of core–annular flow
Non-axisymmetric instability of core–annular flow
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DOI：
10.1017/s0022112095002485
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发表时间：
1995-05
影响因子：
3.7
通讯作者：
Howard H. Hu;N. Patankar
中科院分区：
文献类型：
--
作者：
Howard H. Hu;N. Patankar
考虑非轴对称扰动，研究了垂直圆管内油水环空流动的稳定性。结果表明：当油芯较薄时，油芯的流动最不稳定，表现为不对称的弯曲扰动模式，油芯以螺旋波的形式运动。对于相当大范围的材料和流动参数，非对称扰动模式是最危险的。这种不对称模式在上下流动的垂直管道和水平管道中持续存在。该分析也适用于自由上升的轴对称香烟烟雾或热羽流的不稳定性。这项研究预测了不对称曲波的独特波长。
Stability of core-annular flow of water and oil in a vertical circular pipe is studied with respect to non-axisymmetric disturbances. Results show that when the oil core is thin, the flow is most unstable to the asymmetric sinuous mode of disturbance, and the core moves in the form of corkscrew waves as observed in experiments. The asymmetric mode of disturbance is the most dangerous mode for quite a wide range of material and flow parameters. This asymmetric mode persists in vertical pipes with upward and downward flows and in horizontal pipes. The analysis also applies to the instability of freely rising axisymmetric cigarette smoke or a thermal plume. The study predicts a unique wavelength for the asymmetric meandering waves.