Borcia Rodica, Bestehorn Michael
Lehrstuhl Statistische Physik/Nichtlineare Dynamik, Brandenburgische Technische Universität, D-03046 Cottbus, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Sep;82(3 Pt 2):036312. doi: 10.1103/PhysRevE.82.036312. Epub 2010 Sep 16.
Fusion of sessile droplets with body of different liquids is delayed when the approaching drops are sitting on a highly wettable solid substrate. Owing to the surface tension gradients between the mixing drops, a Marangoni driven flow through the connecting channel appears. Experiments of delayed coalescence were recently reported in [Langmuir 24, 6395 (2008)10.1021/la800630w] for millimeters sized drops. For droplets of submillimeter dimensions, capillary forces dominate. The control of interfacial energies becomes an important strategy for manipulating tiny droplets along the solid surfaces. In this paper we present phase field simulations in two spatial dimensions for microdroplets of perfectly miscible liquids. For drops with a given geometry, systematic investigations were performed for different fluid viscosities. Different behaviors are observed from chasing droplets to droplets repelling.
当接近的液滴位于高度可湿的固体基质上时，无柄液滴与不同液体主体的融合会延迟。由于混合液滴之间的表面张力梯度，会出现通过连接通道的马兰戈尼驱动流。最近在[《朗缪尔》24, 6395 (2008)10.1021/la800630w]中报道了毫米级液滴的延迟聚结实验。对于亚毫米尺寸的液滴，毛细力起主导作用。控制界面能成为沿固体表面操纵微小液滴的重要策略。在本文中，我们给出了完全互溶液体微滴在二维空间中的相场模拟。对于给定几何形状的液滴，针对不同的流体粘度进行了系统研究。观察到了从追逐液滴到液滴排斥的不同行为。
