揭示了可混合,易挥发的马兰戈尼传播的独特缩放行为
Anurag Pant1, Baburaj A Puthenveettil1
1Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology Madras, Chennai-600036, India. akkupant@gmail.com.
Soft matter
|May 20, 2024
概括
这项研究揭示了乙醇-水膜传播的新缩放规律,与以前的模型不同. 这些发现解释了电影的复杂膨胀动态.
科学领域:
- 流体动力学 流体动力学
- 接口现象 接口现象
- 材料科学是一种材料科学.
背景情况:
- 了解液膜扩散对于各种应用至关重要.
- 现有的挥发性,可混合的液体扩散模型不能完全捕捉观察到的动态.
- 乙醇-水混合物由于挥发性和可混合性而表现出复杂的界面行为.
研究的目的:
- 为了研究在水基板上快速扩散的乙醇水膜的膨胀动态.
- 为电影的外尖半径和速度制定新的缩放规律.
- 为了阐明控制电影复杂传播行为的潜在物理机制.
主要方法:
- 实验观察乙醇-水膜的扩散.
- 测量外尖半径 (r_o) 和速度 (U_o) 随着时间的推移.
- 理论建模以根据片结构推导出新的缩放规律.
主要成果:
- 观察到的外尖半径 (r_o) 和速度 (U_o) 显示出复杂的缩放,偏离t^(3/4) 和t^(1/4).
- 通过考虑稳定的 (r_f ~ t^(1/4)) 和不稳定的 (l_p ~ t^(3/4) 电影区域,提出了新的缩放规则.
- 导出了r_o的两项缩放定律,近似r_o ~ t^(1/2),并用实验数据验证.
结论:
- 新的缩放规律准确地描述了乙醇水膜的扩张.
- 这些发现提供了对可混合,挥发性液体扩散的更全面的理解.
- 拟议的模型成功地解释了马兰戈尼应力,粘性力和羽毛动力学之间的相互作用.
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