On the physics of aerobreakup
On the physics of aerobreakup
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DOI：
10.1063/1.2907989
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发表时间：
2008-05
影响因子：
4.6
通讯作者：
T. Theofanous;G. -. Li
中科院分区：
文献类型：
--
作者：
T. Theofanous;G. -. Li
通过使用激光诱导荧光可视化液滴突然暴露于超音速气流，我们表明，以前可用的实验结果，这是基于阴影法，允许误解，导致不适当的概念化（和理论）的物理学，管理分裂在高韦伯数（我们>103）-而不是瑞利泰勒穿刺，主要的机制是在如此产生的拉伸液体片上具有显著径向分量和不稳定性的剪切诱导运动。在低韦伯数（We<102）下，新的数据揭示了瑞利-泰勒不稳定性多波穿透的定量特征。高分辨率的图像提供了独特的界面不稳定性，特别是液滴破碎的直接数值模拟合适的基准。
By using laser-induced fluorescence to visualize liquid drops that are suddenly exposed to supersonic gas streams, we show that the previously available experimental results, which are based on the shadowgraph method, allowed misinterpretations that have lead to inappropriate conceptualizations (and theory) of the physics that govern breakup at high Weber numbers (We>103)—instead of the Rayleigh–Taylor piercing, the dominant mechanism is shear-induced motion with a significant radial component and instabilities on the so-generated, stretched liquid sheet. At low Weber numbers (We<102), the new data reveal the quantitative features of multiwave piercing by Rayleigh–Taylor instabilities. The highly resolved images provide uniquely suitable benchmarks for direct numerical simulations of interfacial instabilities in general and of drop breakup in particular.