Experimental Investigation of Shock-Induced Tandem Droplet Breakup

This dataset is related to the publication "Experimental Investigation of Shock-Induced Tandem Droplet Breakup" and contains images, videos and figure data files. For deeper insights into the dynamics of dense sprays, the present experimental work investigates the shock-induced breakup of two identically-sized water droplets in tandem formation. The breakup process is visualized in a shadowgraph system and captured by an ultra-high-speed camera. The experimental Weber number ranges from 13 to 180 and the separation distance between droplets is varied between 1.2 and 10.5 times of the droplet diameter. While the tandem formation exerts marginal influence on the lead droplet, the breakup intensity of the trailing droplet is consistently attenuated as the separation distance falls below critical levels. The time of initial deformation is postponed, the maximum cross-stream diameter is reduced, and the mean drag coefficient is lowered. These effects are more profound at lower Weber numbers and closer separation distances. The attenuation of the breakup intensity is also reflected by the formation of smaller bags in bag and bag-and-stamen morphologies and by the narrower cross-stream dispersion of fragments in multibag and shear stripping morphologies. When positioned in close proximity to the lead droplet, the trailing droplet fails to follow the conventional breakup morphologies. Instead, it either punctures or coalesces with the lead droplet.本数据集关联于学术论文《激波诱导串联液滴破碎的实验研究》，包含图像、视频及图形数据文件。为深入探究稠密喷雾的动力学特性，本实验研究了串联排布的两个等尺寸水滴的激波诱导破碎过程。破碎过程通过阴影摄影系统可视化，并由超高速相机记录采集。实验中的韦伯数（Weber number）取值范围为13至180，液滴间的间距在液滴直径的1.2倍至10.5倍之间可调。尽管串联排布对前导液滴的影响微弱，但当液滴间距低于临界值时，尾随液滴的破碎强度会持续被削弱。初始变形时刻被延后，垂直来流方向的最大直径减小，平均阻力系数也有所降低。在较低韦伯数与较小间距的工况下，上述抑制效应更为显著。破碎强度的削弱还体现在：袋状与袋-蕊状破碎形态中会生成更小的液袋，多袋状与剪切剥离型破碎形态中，破碎产物的横向扩散范围更窄。当尾随液滴与前导液滴间距过近时，其将不再遵循常规的破碎形态，而是会发生刺穿或与前导液滴发生聚并。