Bansal Lalit, Miglani Ankur, Basu Saptarshi
Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India-560012.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Oct;92(4):042304. doi: 10.1103/PhysRevE.92.042304. Epub 2015 Oct 6.
We provide a comprehensive physical description of the vaporization, self-assembly, agglomeration, and buckling kinetics of sessile nanofluid droplets pinned on a hydrophobic substrate. We have deciphered five distinct regimes of the droplet life cycle. Regimes I-III consists of evaporation-induced preferential agglomeration that leads to the formation of a unique dome-shaped inhomogeneous shell with a stratified varying-density liquid core. Regime IV involves capillary-pressure-initiated shell buckling and stress-induced shell rupture. Regime V marks rupture-induced cavity inception and growth. We demonstrate through scaling arguments that the growth of the cavity (which controls the final morphology or structure) can be described by a universal function.
我们对固定在疏水基底上的纳米流体 sessile 液滴的蒸发、自组装、团聚和屈曲动力学进行了全面的物理描述。我们已经破解了液滴生命周期的五个不同阶段。阶段 I - III 包括蒸发诱导的优先团聚，这导致形成一个独特的圆顶形不均匀壳层，其具有分层的变密度液芯。阶段 IV 涉及毛细管压力引发的壳层屈曲和应力诱导的壳层破裂。阶段 V 标志着破裂诱导的空洞起始和生长。我们通过标度论证表明，空洞的生长（它控制最终的形态或结构）可以用一个通用函数来描述。
