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arXiv 2402.14635cond-mat.softphysics.chem-phphysics.flu-dyn
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化学反应性薄膜:动力学与稳定性

Chemically reactive thin films: dynamics and stability

Tilman Richter, Paolo Malgaretti, Thomas M. Koller, Jens Harting

AI总结:

本文通过线性稳定性分析和数值模拟,研究催化剂引发的化学反应对液体薄膜稳定性的影响,揭示了反应可稳定或不稳定薄膜的新机制及化学活性液滴的非稳态行为。

摘要:

悬浮在液体薄膜中的催化剂颗粒或配合物可触发化学反应,导致薄膜中反应物和产物的浓度不均匀。我们证明,液体薄膜的气液表面张力对这些不均匀浓度的敏感性强烈影响薄膜的稳定性。利用线性稳定性分析,我们确定了反应可使薄膜稳定或不稳定的新情形。此外,我们发现了迄今为止未被揭示的破裂机制,这些机制在化学惰性情况下不存在。线性稳定性预测得到数值模拟的证实,数值模拟还表明,化学活性液滴的形状可以偏离球冠,并且可能出现行波和驻波等非稳态状态。最后,我们通过证明所选参数范围可被典型实验很好地覆盖,批判性地讨论了预测的相关性。

英文摘要:

Catalyst particles or complexes suspended in liquid films can trigger chemical reactions leading to inhomogeneous concentrations of reactants and products in the film. We demonstrate that the sensitivity of the liquid film's gas-liquid surface tension to these inhomogeneous concentrations strongly impacts the film stability. Using linear stability analysis, we identify novel scenarios in which the film can be either stabilized or destabilized by the reactions. Furthermore, we find so far unrevealed rupture mechanisms which are absent in the chemically inactive case. The linear stability predictions are confirmed by numerical simulations, which also demonstrate that the shape of chemically active droplets can depart from the spherical cap and that unsteady states such as traveling and standing waves might appear. Finally, we critically discuss the relevance of our predictions by showing that the range of our selected parameters is well accessible by typical experiments.

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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