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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Two Liquids Competing On A Glass Substrate

机译:APS-流体动力学APS部门第70届年会-活动-两种液体在玻璃基板上竞争

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The advancing and receding contact angles of a liquid drop on glass are well defined. But how do the contact angles evolve when air is replaced by a second liquid? Based on the liquid-gas-solid case, we would expect the dynamic liquid-liquid-solid contact angles to depend on the capillary number only. For our study, we use a glass capillary tube, initially filled with silicone oil, in which a drop of water is injected. Surprisingly, the water-oil-glass contact angles also depend on the time the substrate spent in contact with silicone oil only, before the water was added. A change in that waiting time can cause large variations of the advancing and receding contact angles.
机译:液滴在玻璃上的前进和后退接触角均已明确定义。但是,当空气被第二种液体代替时,接触角如何变化?基于液-气-固情况,我们期望动态的液-液-固接触角仅取决于毛细管数。在我们的研究中,我们使用玻璃毛细管,首先填充硅油,然后在其中注入一滴水。令人惊讶地,水-油-玻璃的接触角还取决于在添加水之前基材仅与硅油接触所花费的时间。等待时间的变化会导致前进和后退接触角的较大变化。

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