Numerical Investigation of Off-center Collision between Two Equal-sized Water Droplets

IF 1 4区工程技术 Q4 ENGINEERING, CHEMICAL

Atomization and Sprays Pub Date : 2024-08-01 DOI:10.1615/atomizspr.2024052913

Weidong Yu, Shinan Chang, Shuoshuo Wang

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引用次数: 0

Abstract

Droplet collision is a basic phenomenon in numerous natural and industrial processes, while the understanding of collision dynamics is still lacking. In this work, a numerical investigation of off-center collision of two equal-sized water droplets is performed with the Weber number of 14 to 196 and impact parameter of 0 to 0.8. The incompressible Navier-Stokes equations are solved by the finite volume method. Volume of Fluid (VOF) method and adaptive mesh technique are used to capture the gas-liquid interface. Firstly, by comparing with reliable published experimental data, the reliability of the numerical results is verified. Then the shape evolution for coalescence, reflexive separation and stretching separation is described detailly. The effect of the Weber number and impact parameter on the collision of two equal-sized water droplets is analyzed. Moreover, the analysis of the surface energy and kinetic energy is conducted for the collision process. Furthermore, the dimensions of ligament and bridge for high impact parameter stretching separation are presented quantitatively. Finally, the collision outcome for the simulation cases in this work is depicted and discussed. This study is helpful for fundamentally understanding the mechanism of collision dynamics of droplets, as well as applying droplet collision model to related processes.

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两个大小相等的水滴偏离中心碰撞的数值研究

水滴碰撞是众多自然和工业过程中的基本现象，但人们对碰撞动力学的认识仍然不足。在这项工作中，对两个大小相等的水滴在韦伯数为 14 至 196、冲击参数为 0 至 0.8 的条件下的偏心碰撞进行了数值研究。采用有限体积法求解不可压缩的纳维-斯托克斯方程。采用流体体积（VOF）法和自适应网格技术来捕捉气液界面。首先，通过与可靠的公开实验数据进行比较，验证了数值结果的可靠性。然后详细描述了凝聚、反射分离和拉伸分离的形状演变。分析了韦伯数和冲击参数对两个大小相等的水滴碰撞的影响。此外，还分析了碰撞过程中的表面能和动能。此外，还定量给出了高冲击参数拉伸分离时韧带和桥梁的尺寸。最后，对本研究中模拟案例的碰撞结果进行了描述和讨论。这项研究有助于从根本上理解液滴碰撞动力学机理，并将液滴碰撞模型应用到相关过程中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atomization and Sprays 工程技术-材料科学：综合

CiteScore

2.10

自引率

16.70%

发文量

审稿时长

1.7 months

期刊介绍： The application and utilization of sprays is not new, and in modern society, it is extensive enough that almost every industry and household uses some form of sprays. What is new is an increasing scientific interest in atomization - the need to understand the physical structure of liquids under conditions of higher shear rates and interaction with gaseous flow. This need is being met with the publication of Atomization and Sprays, an authoritative, international journal presenting high quality research, applications, and review papers.