Effect of phase change and solute diffusion on spreading on a dissolving substrate
Effect of phase change and solute diffusion on spreading on a dissolving substrate
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DOI：
10.1016/j.actamat.2009.08.033
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发表时间：
2009-12
期刊：
影响因子：
9.4
通讯作者：
W. Villanueva;W. Boettinger;J. Warren;G. Amberg
中科院分区：
文献类型：
--
作者：
W. Villanueva;W. Boettinger;J. Warren;G. Amberg
使用包含流体流动、溶质扩散和相变的扩散界面模型对溶解润湿进行数值研究。研究了一系列材料参数：(1) 通过抑制基材的溶解来恢复流体动力学极限，以及 (2) 评估扩散的作用。给出了液滴尺寸、液滴浓度和界面之间的角度的时间历史。对于对流占主导地位的情况，扩散动力学与已知的惰性流体扩散流体动力学模型一致。由于三重接点附近发生冷凝，相变增加了润湿速度。润湿动力学也对溶质扩散率有很强的依赖性。还讨论了扩散过程中成分变化的细节，例如在液滴中不同位置探测的大量液体的成分路径。
Dissolutive wetting is investigated numerically using a diffuse-interface model that incorporates fluid flow, solute diffusion and phase change. A range of materials parameters are investigated: (1) permitting recovery of the hydrodynamic limit by suppressing the dissolution of the substrate and (2) evaluating the role of diffusion. The time history of droplet size, droplet concentration and angles between the interfaces are given. For cases in which convection dominates, the dynamics of spreading agrees with a known hydrodynamic model for spreading of inert fluids. A phase change increases wetting speed, due to a condensation that takes place near the triple junction. There is also a strong dependence of the wetting kinetics on the solute diffusivities. Details of composition changes during spreading are also discussed, such as the composition path of the bulk liquid probed at different locations in the drop.