没有平衡的界面扩散性解决了单层水力动力学中的异常
Tyler J Mucci1, Bruce L Liu1, Joe A Adam1
1Rensselaer Polytechnic Institute, Department of Mechanical, Aerospace and Nuclear Engineering, Troy, New York 12180, USA.
Physical review. E
|February 20, 2025
概括
研究人员发现,在非平衡系统中使用平衡表面扩散率会导致表面膨胀粘度异常. 增强的扩散性,可能是由于相域,解释了表面活性剂单层水力动力学中的这些问题.
科学领域:
- 物理化学 物理化学
- 流体动力学 流体动力学
- 表面科学是一门学科.
背景情况:
- 表面活性剂单层的水力动力学取决于表面张力,剪切粘度,膨胀粘度和扩散性.
- 表面膨胀粘度研究显示出异常,包括明显的负值,这表明理解的差距.
- 现有的模型经常假设平衡条件,这可能不适用于动态界面现象.
研究的目的:
- 为了调查在表面膨胀粘度测量中观察到的异常.
- 确定导致表面活性剂单层水力动力学差异的因素.
- 确定表面扩散在非平衡界面流系统中的作用.
主要方法:
- 采用全场界面速度测量以捕捉动态表面行为.
- 利用纳维埃-斯托克斯方程来建模和分析界面流场.
- 在非平衡系统中比较的测量结果与基于平衡表面扩散率的预测.
主要成果:
- 揭示了使用平衡表面扩散性用于非平衡系统是异常的来源.
- 观察到的表面扩散率值超过7个数量级,大于非状流场中的平衡值.
- 在单层中确定了微米大小的相域,作为这种增强扩散性的可能原因.
结论:
- 该研究强调了在界面水力动力学中考虑非平衡效应的关键重要性.
- 表面膨胀粘度的明显异常可以通过动态系统中表面扩散率的显著增强来解释.
- 微米大小的相域被认为是一个关键的结构特征,可以提高扩散性,并影响单层水力动力学.
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