论文标题
液滴变形和空气剪切流中的分解
Droplet deformation and breakup in shear flow of air
论文作者
论文摘要
在喷雾和雾化过程的许多应用中，空气流中液滴的变形和破裂很重要。但是，从未报道过气流的剪切效果。在这项研究中，使用高速成像，数字图像处理和粒子图像速度法对空气剪切流中的液滴的变形和破裂进行了研究。我们确定了一种新的液滴分解模式，即蝴蝶分裂，其中液滴下部的强气动压力会导致液滴的偏转，然后导致蝴蝶形袋的形成。产生了液滴分解的制度图，并根据缩放分析获得不同模式之间的过渡。分析了液滴边缘的伸长和碎片，结果表明，它们通过剪切的形成和边缘上的节点的生长显着影响它们。
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.
