Thermal-solutal-induced bistability of evaporating multicomponent liquid thin films

• 成果类型: Article
• 署名作者: Wakata, Yuki; Wang, Feng; Sun, Chao; Lohse, Detlef
• 署名单位: Tsinghua University; Tsinghua University; Max Planck Society
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-10602
• DOI: 10.1073/pnas.2418487122
• 发表日期: 2025-02-11
• 关键词: convection; cells

摘要

Volatile multicomponent liquid films show rich dynamics, due to the complex interplay of gradients in temperature and in solute concentrations. Here, we study the evaporation dynamics of a tricomponent liquid film, consisting of water, ethanol, and trans-anethole oil (known as ouzo'). With the preferential evaporation of ethanol, cellular convective structures are observed both in the thermal patterns and in the nucleated oil droplet patterns. However, the feature sizes of these two patterns can differ, indicating dual instability mechanisms dominated by either temperature or solute concentration. Using numerical simulations, we quantitatively compare the contributions of temperature and solute concentration on the surface tension. Our effect gradually becomes dominant. By regulating the transition time of this thermalsolutal-induced bistability and the nucleation time of oil microdroplets in the ternary precise manipulation of nucleation and deposition processes at larger scales.