Numerical study of the process of liquid droplets impacting the curved wall surface
Numerical study of the process of liquid droplets impacting the curved wall surface
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DOI：
10.1080/10407782.2023.2220907
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Z. Ma;Xiaojing Ma;Bowen Zhang;Xinpeng Xiao;Mengyao Fan
中科院分区：
文献类型：
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作者：
Z. Ma;Xiaojing Ma;Bowen Zhang;Xinpeng Xiao;Mengyao Fan
摘要 液滴撞击固体壁是一种典型的自由表面流现象，广泛存在于自然界、工业和日常生活中。根据液滴中心厚度、液滴的变化，随着撞击时间的增加，液滴的铺展过程通常分为三个独特的阶段：初始液滴变形阶段、惯性主导阶段和粘度主导阶段。采用平滑粒子流体动力学（SPH）方法模拟了不同冲击条件下液滴的铺展问题。首先，模拟了液滴铺展的动态过程，并与相关实验结果进行比较，验证了该方法的有效性。然后，研究分析了韦伯数和液滴与弯曲壁面的直径比对液滴最大铺展直径和中心厚度的影响。在此基础上，拟合了韦伯数与最大撒播直径之间现有关系中的关键系数。最后，评估了液滴铺展第三阶段中心厚度和撞击时间的拟合方程。
Abstract The impact of droplets on the solid wall is a typical free surface flow phenomenon that widely exists in nature, industry, and daily life. According to the change of the droplet’s center thickness, the droplet, the spreading process of the droplet is usually divided into three unique stages: the initial droplet deformation stage, the inertia-dominated stage, and the viscosity-dominated stage with the increase of the impact time. The problem of the liquid droplet spreading under different impact conditions is simulated by the smoothed particle hydrodynamics (SPH) method. Firstly, the dynamic process of droplet spreading is simulated and compared with relevant experimental results to verify the effectiveness of the proposed method. Then, the effects of the Weber number and the diameter ratio of the droplet to the curved wall surface on the droplet’s maximum spreading diameter and central thickness were studied and analyzed. On this basis, the key coefficient in the existing relationship between the Weber number and maximum spreading diameter is fitted. Finally, the fitting equation of the center thickness and the impact time in the third stage of droplet spreading is assessed.