中心冲击后,疏水形形尖端的滴裂:度和湿性质的影响
Xiaoteng Zhou1, Diego Diaz1,2, Zhongyuan Ni1
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. kappl@mpip-mainz.mpg.de.
Soft matter
|February 19, 2025
概括
水滴对尖的影响取决于速度,尖度和表面的湿透性. 超疏水表面会导致反弹或分裂,而疏水表面会导致沉积或分裂,临界韦伯数预测结果.
科学领域:
- 流体动力学 流体动力学
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
背景情况:
- 落对结构的影响很常见,但对尖的影响还没有得到充分的研究.
- 了解这些影响对于工业和日常生活应用至关重要.
研究的目的:
- 调查速度,尖几何形状和表面湿透度对水滴撞击结果的影响.
- 用一个关键的韦伯数来描述滴沉积/反弹和分裂之间的过渡.
主要方法:
- 结合实验成像与流体体积 (VOF) 模拟.
- 测试的水滴落在具有超疏水性和疏水性聚烯 (PS) 表面的尖上.
- 根据撞击速度,角和顶部宽度分析掉落行为.
主要成果:
- 在超水的表面上,滴完全反弹或分裂.
- 在疏水的PS表面上,滴滴沉积或分裂.
- 一个关键的韦伯数 (We) 支配了过渡,随着顶的宽度和角度而增加,并受到湿特性的影响.
结论:
- 尖的几何形状和表面的湿透性显著改变了落下撞击的动态.
- 关键韦伯数为尖上的落下行为提供了一个预测参数.
- 这些发现可以为抗结冰结构和高效的微滴生成设计提供信息.
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