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随机粗表面倾斜和曲率对滴滴反弹的影响的数值分析
1School of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|September 5, 2025
概括
表面粗性显著影响滴滴动态,减少接触时间并影响弹跳行为. 了解像斜率和曲率这样的统计参数是设计工程应用有效的疏水表面的关键.
科学领域:
- 表面科学与工程
- 流体动力学
- 材料科学
背景情况:
- 表面上的液滴动态对于防结冰,防腐蚀和自洁应用至关重要.
- 微/纳米结构的疏水表面对于控制滴滴行为至关重要.
- 目前的实验限制阻碍了对滴滴反弹的统计粗效应的理解.
研究的目的:
- 使用统计参数 (斜度,曲率) 开发可控制的粗表面模型.
- 研究表面粗度对液滴扩散,收缩和脱落的影响.
- 提供对滴滴撞击过程中的能量消散机制的定量见解.
主要方法:
- 使用快速里埃转换 (FFT) 和皮尔森分布转换来创建粗的表面模型.
- 在气液双相计算流体动力学 (CFD) 框架中实现了粗度模型作为边界条件.
- 在CFD-Post中使用同等的分析表达式来量化滴滴扩散过程中的接触体积分数.
主要成果:
- 与光滑表面相比,表面粗性将滴滴接触时间减少了高达16.15%.
- 对于大多数参数组合,观察到接触体积分数和接触时间之间的反向相关性,这表明固定效应占主导地位.
- 极端粗度参数抑制了反弹和扩散,而特定的曲率范围 (3-3.5) 和斜度 (±0.2) 增强了反弹.
结论:
- 统计表面粗度参数显著影响液滴与表面的相互作用和反弹动态.
- 尖度的固定效应是能量消耗的主要因素.
- 这些发现为优化疏水表面设计和后处理提供了理论基础,以提高性能.
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