论文标题
在加热的基板上对干燥的挥发性液滴进行建模不稳定的Bénard-Marangoni不稳定性
Modeling unsteady Bénard-Marangoni instabilities in drying volatile droplets on a heated substrate
论文作者
论文摘要
我们在加热的基板上以恒定的接触线模式蒸发的毛细管尺寸的无柄液滴研究不稳定的内部流动。已经对乙醇和硅油蒸发液滴中的内部流进行了三维模拟。为了描述Marangoni流动，我们发现有必要说明蒸气在空气中的扩散，这三个阶段的热传导和热辐射。该方程已通过使用ANSYS Fluent通过有限元方法来求解。由于模拟，获得了Bénard-Marangoni（BM）不稳定性的非平稳行为。在第一阶段，三重线附近的BM细胞的花结构出现。对于较小的接触角，细胞的大小生长并占据了液滴表面的中央区域。与最近的实验和理论研究密切相关，结果获得了帮助分析和解决相关问题。
We study unsteady internal flows in a sessile droplet of capillary size evaporating in constant contact line mode on a heated substrate. Three-dimensional simulations of internal flows in evaporating droplets of ethanol and silicone oil have been carried out. For describing the Marangoni flows we find it necessary to account for the diffusion of vapor in air, the thermal conduction in all three phases and thermal radiation. The equations have been solved numerically by finite element method using ANSYS Fluent. As a result of the simulations, the nonstationary behavior of Bénard-Marangoni (BM) instabilities is obtained. At the first stage, a flower structure of BM cells near the triple line emerge. For smaller contact angles, the cells grow in size and occupy the central region of the droplet surface. Being closely connected with recent experimental and theoretical studies, the results obtained help to analyze and resolve the associated issues.
