Simulation of droplet impact dynamics on V-shaped walls

IF 2.2 3区工程技术 Q2 MECHANICS Theoretical and Computational Fluid Dynamics Pub Date : 2023-05-05 DOI:10.1007/s00162-023-00652-3

Guoqiang Wu, Sheng Chen

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Abstract

This paper presents the morphological evolution characteristics of a droplet impacting a V-shaped wall by using the lattice Boltzmann method (LBM). Four parameters are investigated comprehensively. The parameters vary over wide ranges: surface wettability (\(60^\circ \le \theta ^{eq} \le 120^\circ \)), Weber number (\(102.27 \le \text {We} \le 3681.82\)), bending angle of the V-shaped wall (90\(^\circ \le \theta \le 180^\circ \)), and eccentricity ratio (0 \(\le b \le \) 0.5). Two types of collision are observed: deposition and breakage. For breakage, the number of satellite droplets increases against the increment of We. The splashing occurs for a high We. And the lamella ejection is observed on the hydrophilic wall and the neutral wall. The lamella ejection will be slight against the increase of \(\theta ^{eq}\), while it will become obvious against the increment of \(\theta \). In addition, the nondimensional spreading length, width, and height are measured and analyzed. Regime maps are established based on We, Re, and \(\theta \).

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v型壁面上液滴撞击动力学模拟

本文用晶格玻尔兹曼方法研究了液滴撞击v型壁面时的形态演化特征。对四个参数进行了综合研究。表面润湿性(\(60^\circ \le \theta ^{eq} \le 120^\circ \))、韦伯数(\(102.27 \le \text {We} \le 3681.82\))、v型壁弯曲角(90 \(^\circ \le \theta \le 180^\circ \))、偏心率(0 \(\le b \le \) 0.5)等参数变化范围很广。观察到两种类型的碰撞:沉积和破碎。对于破碎，卫星液滴的数量随着We的增加而增加。飞溅发生在高We。在亲水性壁和中性壁上均观察到片状喷射现象。随着\(\theta ^{eq}\)的增大，片层抛射逐渐减弱，随着\(\theta \)的增大，片层抛射逐渐明显。此外，对无量纲铺展长度、宽度和高度进行了测量和分析。政权地图是基于We、Re和\(\theta \)建立的。

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来源期刊

Theoretical and Computational Fluid Dynamics 物理-力学

CiteScore

5.80

自引率

2.90%

发文量

审稿时长

>12 weeks

期刊介绍： Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.

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