Spreading behaviors of shear-thinning droplets impacting on solid surfaces with various wettability

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2024-07-16 DOI:10.1007/s13367-024-00098-x

Ding Yang, Jiaqi Chen, Ao Shen, Junfeng Wang, Hailong Liu

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Abstract

The spreading behavior of droplets impacting solid surfaces is of significant importance in numerous industrial and medical applications. This study specifically focuses on the droplet impact behaviors of shear-thinning fluids. Extensive impact experiments were conducted using high-speed visualization techniques. Image sequences in the DI water and xanthan gum solution droplets impact process are captured at a We range of around 3.2–388 and Re_n of 18–8145. The morphologies of spreading droplets on hydrophilic, moderate, and hydrophobic surfaces was observed with temporal evolution. The experimental results showed that the spreading behavior of shear-thinning droplets varies with the impact velocity, surface wettability, and fluid concentration. The droplets spread more widely and rapidly at larger We with the time evolution of the spreading factor. In addition, the spreading of the droplets becomes suppressed on a hydrophobic surface or with a higher xanthan concentration. With the increase of We, the effect of fluid viscosity gradually surpasses the surface wettability. The fluid viscosity with the shear-thinning properties has more influence on the spreading behavior at high We. Furthermore, the experimental data of the maximum spreading factor could be scaled with the We and Re_n at low and high We, respectively. Finally, the maximum spreading of shear-thinning droplets was correlated with a universal rescaling model. The correlation shows good accordance with the experimental results of droplet impact from this study and the literature in a wide range of impact conditions and shear-thinning properties.

Graphical abstract

Abstract Image

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剪切稀化液滴撞击不同润湿性固体表面时的扩散行为

液滴冲击固体表面的扩散行为在众多工业和医疗应用中具有重要意义。本研究特别关注剪切稀化流体的液滴冲击行为。使用高速可视化技术进行了广泛的冲击实验。DI 水和黄原胶溶液液滴撞击过程的图像序列是在 3.2-388 左右的 We 范围和 18-8145 的 Ren 范围内捕获的。观察了液滴在亲水、中等和疏水表面上扩散的形态随时间的变化。实验结果表明，剪切稀化液滴的扩散行为随冲击速度、表面润湿性和流体浓度而变化。随着扩散因子的时间演化，液滴在较大的 We 上扩散得更广、更快。此外，在疏水表面或黄原胶浓度较高时，液滴的扩散会受到抑制。随着 We 的增加，流体粘度的影响逐渐超过了表面润湿性。在高 We 条件下，具有剪切稀化特性的流体粘度对铺展行为的影响更大。此外，在低 We 和高 We 条件下，最大铺展系数的实验数据可分别与 We 和 Ren 成比例关系。最后，将剪切稀化液滴的最大铺展与通用重定标模型进行了关联。在各种冲击条件和剪切稀化特性下，本研究的液滴冲击实验结果与文献中的相关结果显示出良好的一致性。

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

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.