UFO：由热毛细作用驱动的“未识别”漂浮物体
UFO: "Unidentified" Floating Object Driven by Thermocapillarity
摘要：
在这个流体动力学视频中，我们展示了水和庚醇的二元液滴的热毛细致动，其中二元液滴在运动中呈现出类似UFO的形状。在经受线性温度梯度的聚对二甲苯涂覆的硅表面上，纯庚醇液滴通过Marangoni应力快速移动到冷侧，而纯水液滴由于大的接触角滞后而保持被卡住。当水滴被一层薄薄的庚醇包裹并热致动时，二元液滴呈现出类似UFO的特殊形状，即一个“身份不明”的漂浮物体，因为其机制尚未完全理解。我们的发现表明，纯液滴（例如，水溶液），这是不利于热毛细致动，可以通过封装它们与另一个明智地选择的液体（例如，庚醇）。
英文摘要：
In this fluid dynamics video, we show thermocapillary actuation of a binary drop of water and heptanol where the binary drop in motion takes on a UFO-like shape. On a parylene-coated silicon surface subjected to a linear temperature gradient, a pure heptanol droplet quickly moves to the cold side by the Marangoni stress, while a pure water droplet remains stuck due to a large contact angle hysteresis. When the water droplet was encapsulated by a thin layer of heptanol and thermally actuated, the binary droplet takes on a peculiar shape resembling an UFO, i.e. an "unidentified" floating object as the mechanism is not yet completely understood. Our finding suggests that pure liquid droplets (e.g. aqueous solutions) that are not conducive to thermocapillary actuation can be made so by encapsulating them with another judiciously chosen liquid (e.g. heptanol).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
