Droplets spontaneously move when they are placed at the tip of a cone surface. Using three dimensionally printed structures, we experimentally explore a large panel of configurations regarding the aperture angle of the cone. We evidence a change of the droplet geometry while moving along the conical fiber. This transition is a switch of configuration from barrel to clamshell shape. The consequence is a change in the droplet dynamics. We estimate the position of this geometrical transition and we propose two models to describe the motion of the barrel and the clamshell droplets. While both shapes are driven by capillary forces, the dissipation is dependent on the geometrical configuration. For barrel shape droplets the main dissipation appears to be in the liquid wedge. For clamshell shape droplets the dissipation occurs mainly in the liquid film close to the conical fiber.

中文翻译：

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毛细管从锥形纤维上的桶状液滴到蛤壳状液滴的运输

将液滴放置在锥形表面的尖端时，它们会自发移动。使用三维打印的结构，我们实验性地探索了有关圆锥体孔径角的大型配置面板。我们证明了沿着圆锥形纤维移动时液滴几何形状的变化。这种转变是从桶形到翻盖形的配置转换。结果是液滴动态变化。我们估计了这种几何过渡的位置，并提出了两个模型来描述桶形和蛤壳状液滴的运动。虽然这两种形状都是由毛细作用力驱动的，但耗散取决于几何形状。对于桶状液滴，主要耗散似乎在液体楔形中。