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arXiv 2005.06240physics.flu-dyn
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剪切流场中液滴的变形与破碎

Droplet deformation and breakup in shear flow of air

Zhikun Xu, Tianyou Wang, Zhizhao Che

摘要:

液滴在气流中的变形和破碎在喷雾和雾化过程的许多应用中是重要的。然而,气流的剪切效应从未被报道过。在这项研究中,变形和破碎的液滴在剪切流的空气中进行了实验研究,使用高速成像,数字图像处理,粒子图像测速仪。我们确定了一种新的液滴破碎模式,即,蝶形破碎,其中液滴下部的强大空气动力学压力导致液滴偏转,然后形成蝶形袋。通过尺度分析,得到了液滴破碎的状态图,并得到了不同模式之间的转换。对液滴边缘的伸长和破碎进行了分析,结果表明,剪切通过液滴边缘节点的形成和生长对液滴边缘的伸长和破碎产生显著影响。

英文摘要:

The deformation and breakup of droplets in air flows is important in many applications of spray and atomization processes. However, the shear effect of airflow has never been reported. In this study, the deformation and breakup of droplets in the shear flow of air is investigated experimentally using high-speed imaging, digital image processing, and particle image velocimetry. We identify a new breakup mode of droplets, i.e., the butterfly breakup, in which the strong aerodynamic pressure on the lower part of the droplet leads to the deflection of the droplet and then the formation of a butterfly-shaped bag. A regime map of the droplet breakup is produced, and the transitions between different modes are obtained based on scaling analysis. The elongation and the fragmentation of the droplet rim are analyzed, and the results show that they are significantly affected by the shear via the formation and the growth of nodes on the rim.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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