液滴式空气复苏中韧带的形成和反复脱落
On the formation and recurrent shedding of ligaments in droplet aerobreakup
摘要：
水滴的破碎时，暴露于高速气流的研究使用高放大倍率的阴影实验以及全三维的数值模拟，这占粘性以及毛细管效应。经过彻底验证的模拟与实验，我们阐明了韧带的形成过程和表面张力的效果。通过流场的傅立叶分解，我们观察到特定方位角模式的发展，这使液滴周围的液体片不稳定。最终，液体层破裂，导致韧带的形成。我们进一步观察到韧带的形成和脱落是一个反复的过程。虽然第一韧带脱落弱依赖于韦伯数，随后的脱落过程似乎主要是由惯性和变形液滴尾流中的旋涡脱落驱动。
英文摘要：
The breakup of water droplets when exposed to high-speed gas flows is investigated using both high-magnification shadowgraphy experiments as well as fully three-dimensional numerical simulations, which account for viscous as well as capillary effects. After thorough validation of the simulations with respect to the experiments, we elucidate the ligament formation process and the effect of surface tension. By Fourier decomposition of the flow field, we observe the development of specific azimuthal modes, which destabilize the liquid sheet surrounding the droplet. Eventually, the liquid sheet is ruptured, which leads to the formation of ligaments. We further observe the ligament formation and shedding to be a recurrent process. While the first ligament shedding weakly depends on the Weber number, subsequent shedding processes seem to be driven primarily by inertia and the vortex shedding in the wake of the deformed droplet.
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