Data for: Vortex-ring-induced elliptical drop deformation process in ambient liquid under an impact: The effects of the drop shape and other parameters

In this paper, the elliptical drop deformation process in ambient liquid under an impact was systematically studied based on an experimental method combined with computational fluid dynamics (CFD). The experiments were conducted on a free-falling drop-tower facility, and the images of the drop shapes were captured by high-speed photography. In the numerical simulation, the Front-Tracking method was adopted to predict the drop deformation process, and a satisfactory consistency was obtained between experimental and numerical results. Furthermore, the effects of nondimensional parameters (i.e., shape parameter e, viscosity ratio , and density ratio ) on the vortex dynamics during the drop deformation process in ambient liquids were systematically investigated. The severity of the elliptical drop deformation process is apparently promoted by e, i.e., with larger e, the vortex dynamics during the drop deformation process is strengthened, and a more severe deformation process occurs. With increasing , the vortex dynamics is gradually weakened. Under a relatively low , the vortex dynamics can be further strengthened by increasing e, while the vortex dynamics shows an opposite trend by decreasing e under a relatively high . With increasing , the vortex dynamics is also apparently strengthened. Under the incompressible condition, the vortex dynamics is approximately unaffected by increasing e.

本文基于实验与计算流体动力学（Computational Fluid Dynamics，CFD）相结合的研究方法，系统探究了冲击作用下环境液体中椭圆形液滴的变形过程。本研究采用自由下落液滴塔装置开展实验，并通过高速摄影技术捕捉液滴形态图像。数值模拟环节采用前沿跟踪法（Front-Tracking method）对液滴变形过程进行预测，实验结果与数值模拟结果之间展现出良好的一致性。此外，本研究还系统考察了无量纲参数（即形状参数e、黏度比、密度比）对环境液体中液滴变形过程内涡旋动力学的影响。形状参数e可显著提升椭圆形液滴变形过程的剧烈程度：e值越大，液滴变形过程中的涡旋动力学效应越强，变形过程也愈发剧烈。随着黏度比的升高，涡旋动力学效应逐步减弱。当黏度比较低时，增大e可进一步强化涡旋动力学效应；而当黏度比较高时，减小e则会呈现相反的变化趋势。随着密度比的增大，涡旋动力学效应同样会显著增强。在不可压缩条件下，增大e对涡旋动力学效应几乎无影响。