Effect of a wake on drag and deformation of liquid column at high Weber numbers
Effect of a wake on drag and deformation of liquid column at high Weber numbers
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DOI：
10.1299/jfst.2020jfst0006
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发表时间：
2020
影响因子：
0.8
通讯作者：
T. Kamiya;M. Asahara;T. Miyasaka
中科院分区：
文献类型：
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作者：
T. Kamiya;M. Asahara;T. Miyasaka
没有被彻底研究过。此外，本研究还研究了尾流对液柱变形的影响。虽然固体球在气流中的阻力系数比较简单并且长期以来被广泛研究，但由于液滴的变形和破碎以及内部流动效应，它不能直接用作液滴在气流中的阻力系数。因此，测量了气流中变形液滴的阻力系数。 Hsiang 和 Faeth (1995) 观察到空气中冲击波引发的扰动导致液滴变形和破裂。他们从雷诺数为 1000-2000 的液滴的质心轨迹获得了阻力系数。在此范围内，变形产生的阻力系数的增加效应 摘要 本研究的目的是阐明尾流对高韦伯数 (We) 流的液柱阻力和变形的影响。使用幻影流体法作为两相流求解器，对冲击波后具有高 We 的液柱进行了模拟。模拟的We 为500、1000、2000、3000 和4000。当We = 500 和1000 时，观察到阻力系数有较大的波动。阻力系数的这一特征可能是由于下游界面上的压力变化引起的。压力变化源自尾流。此外，有人认为这种变化的压力可能有助于液柱的扁平化。
not been studied thoroughly. Additionally, this study examines the effect of the wake on the liquid column deformation. Although the drag coefficient of a solid sphere in gas flow is relatively simple and has been widely studied for a long time, it cannot be directly applied as the drag coefficient of a liquid drop in gas flow because of the deformation and disintegration of liquid drops and the internal flow effect. Hence, the drag coefficients of deforming liquid drops in gas flow have been measured. Hsiang and Faeth (1995) observed liquid drop deformation and breakup for shock wave-initiated disturbances in air. They obtained the drag coefficient from the trajectory of the center of mass for a liquid drop at a Reynolds number of 1000–2000. For this range, the increasing effect of the drag coefficient derived from deformation Abstract The objective of this study is to clarify the effect of a wake on liquid column drag and deformation for a high-Weber-number ( We ) flow. A simulation was performed for a liquid column with a high We behind a shock wave, using a ghost fluid method as a two-phase flow solver. The simulated We were 500, 1000, 2000, 3000, and 4000. Relatively large oscillation of the drag coefficients was observed for We = 500 and 1000. This feature of the drag coefficients was possibly caused by varying pressure on the downstream interface. The pressure variation is derived from the wake. In addition, it was suggested that such varying pressures could contribute to the flattening of the liquid column.