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Detailed Numerical Simulations of Unequal Sized Off-Centre Binary Droplet Collisions
International Journal of Multiphase Flow ( IF 3.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ijmultiphaseflow.2020.103267
Sarwasva Chowdhary , S. Rajesh Reddy , R. Banerjee

Abstract A numerical investigation of the binary collision of two off-center unequal sized liquid droplets in the gaseous environment has been performed. The complete process of collision of droplets is dynamically simulated by solving the incompressible Navier–Stokes equations. Simulations are performed using three-dimensional, multiphase finite volume based solver in OpenFOAM platform. The gas-liquid interface is captured by using the volume of fluid (VOF) method. The solver is appropriately validated and is applied to study the effect of the droplet diameter ratio and the impact parameter on the droplet collision characteristics. The numerical study is done by fixing a moderately high Weber number and Reynolds number for unequal sized droplet collision, where stretching separation is expected as a collision outcome for equal sized droplets. The geometrical characteristics of ligament structures are presented both qualitatively and quantitatively. The satellite droplet formation is also well captured with the present simulations. Post-collision characteristics from the simulations are compared with an existing collision model. It is believed that the present study serves as a first step towards the development of a more accurate droplet collision models.

中文翻译:

不等大小的偏心二元液滴碰撞的详细数值模拟

摘要 对气体环境中两个偏心大小不等的液滴的二元碰撞进行了数值研究。通过求解不可压缩的 Navier-Stokes 方程,动态模拟液滴碰撞的完整过程。在 OpenFOAM 平台中使用基于三维、多相有限体积的求解器进行模拟。气液界面是通过使用流体体积 (VOF) 方法捕获的。求解器经过适当验证并用于研究液滴直径比和冲击参数对液滴碰撞特性的影响。数值研究是通过为不等大小的液滴碰撞固定一个中等高的韦伯数和雷诺数来完成的,其中拉伸分离预计是相等大小液滴的碰撞结果。韧带结构的几何特征定性和定量地呈现。本模拟也很好地捕获了卫星液滴的形成。来自模拟的碰撞后特性与现有的碰撞模型进行比较。据信,本研究是开发更准确的液滴碰撞模型的第一步。
更新日期:2020-07-01
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