arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.09798physics.flu-dyn
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有界纳米尺度薄膜上的热毛细波

Thermal capillary waves on bounded nanoscale thin films

Jingbang Liu, Chengxi Zhao, Duncan A. Lockerby, James E. Sprittles

摘要:

利用随机薄膜方程研究了纳米尺度薄膜中限制壁对自由表面起伏的影响。两个典型的边界条件,揭示了约束的影响:(1)强加的接触角和(2)钉扎接触线。线性稳定性分析提供了波动的本征模式,之后热毛细波理论预测了波动幅度。分子动力学(MD)模拟进行测试的预测,并提出了一个朗之万扩散模型来捕捉MD模拟中观察到的接触线的振荡。良好的理论预测和MD模拟结果之间的一致性被恢复,它被发现,约束可以影响整个膜。值得注意的是,波模的长度尺度上的约束被发现影响波动幅度从我们的理论模型,特别是对于3D薄膜。这带来了挑战和未来的调查路线。

英文摘要:

The effect of confining walls on the fluctuation of a nanoscale thin film's free surface is studied using stochastic thin-film equations (STFEs). Two canonical boundary conditions are employed to reveal the influence of the confinement: (1) an imposed contact angle and (2) a pinned contact line. A linear stability analysis provides the wave eigenmodes, after which thermal-capillary-wave theory predicts the wave fluctuation amplitudes. Molecular dynamics (MD) simulations are performed to test the predictions, and a Langevin diffusion model is proposed to capture oscillations of the contact lines observed in MD simulations. Good agreement between the theoretical predictions and the MD simulation results is recovered, and it is discovered that confinement can influence the entire film. Notably, a constraint on the length scale of wave modes is found to affect fluctuation amplitudes from our theoretical model, especially for 3D films. This opens up challenges and future lines of inquiry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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