在干燥表面的滴滴传播过程中测量了拉梅拉厚度的演变,并了解了过程中的能量分布
Surendran Mikhil1, Koushik Biswas1, Shamit Bakshi1
1Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Langmuir : the ACS journal of surfaces and colloids
|June 16, 2025
概括
这项研究使用先进的传感器检查液滴撞击后液膜的演变. 它引入了一个新的能源模型,具有暂时的边界层,用于准确的滴滴传播预测.
科学领域:
- 流体动力学 流体动力学
- 表面科学是一门科学.
- 影响动态的影响力.
背景情况:
- 滴水冲击动态对于各种工业过程至关重要.
- 精确建模液膜演变和能量消耗是必不可少的.
- 现有的模型往往简化了边界层的行为.
研究的目的:
- 在高韦伯和雷诺兹数滴滴冲击期间调查液体膜的时间演变.
- 开发一个改进的基于能源的模型,用于滴滴传播预测.
- 为了结合短暂的边界层效应和早期能量消散.
主要方法:
- 使用色彩对焦传感器测量片厚度.
- 使用影像成像来确定滴滴传播因子.
- 开发基于能源平衡方程的理论框架.
主要成果:
- 识别了滴水高度/叶片厚度演变的不同阶段.
- 提出了一个模型,使用过渡边界层厚度和适当的速度尺度.
- 证明了早期能源消耗在能源预算中的重要性.
- 开发了一种微分能量平衡方程,可以准确地预测传播直径.
结论:
- 拟议的以能量为基础的模型具有暂时的边界层,准确地捕捉了滴滴传播动态.
- 考虑到早期阶段和墙壁边界层消散,可以提高预测能力.
- 这项研究提供了一种更精细的方法来建模滴滴撞击现象.
相关概念视频
01:17Viscosity
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
01:18Boundary Layer Characteristics
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...