论文标题
调节小结构表面上的连续液滴的调节液滴液滴npformat
Modulating Leidenfrost-like Prompt Jumping of Sessile Droplets on Microstructured Surfaces NPformat
论文作者
论文摘要
Leidenfrost效应，即热固体表面上液体滴的悬浮和悬停的效果，通常需要足够高的底物温度来激活强烈的液体蒸发。在这里，我们报告了在明显降低的温度下，在微芯片表面上静态水微动物的敏捷调制敏捷的调制。与传统的Leidenfrost效应相比，出现在230°C以上的传统叶状效应相比，类似鳍阵列的微柱使Wenzel-State Water Microdroplets在130°C的高温下，通过触发惯性控制的单个蒸发池的生长，在130°C的高温下在130°C下悬浮并跳下。我们证明，可以通过简单地通过支柱高度调整热边界层厚度来巧妙调节液滴跳跃，这可以巧妙地调节，这可以调节惯性控制模式和热传递转移剂的模式之间的气泡膨胀。有趣的是，两种气泡生长模式产生了不同的液滴跳跃行为，其特征分别为恒定速度和恒定能量方案。该策略允许以受控的方式在粗糙或结构化表面上轻松清除润湿液滴，从而激发了有希望的应用，以快速清除污染，甚至在地面腔中定居。
The Leidenfrost effect, namely the levitation and hovering of liquid drops on hot solid surfaces, generally requires a sufficiently high substrate temperature to activate the intense liquid vaporization. Here we report the agile modulations of Leidenfrost-like prompt jumping of sessile water microdroplets on micropillared surfaces at a remarkably mitigated temperature. Compared to traditional Leidenfrost effect occurring above 230 °C, the fin-array-like micropillars enables Wenzel-state water microdroplets to levitate and jump off within 1.33 ms at an unprecedently low temperature of 130 °C by triggering the inertia-controlled growth of individual vapor bubbles at the droplet base. We demonstrate that droplet jumping, resulting from the momentum interactions between the expanding vapor bubble and the droplet, can be deftly modulated by simply tailoring the thermal boundary layer thickness via pillar heights, which acts to regulate the bubble expansion between the inertia-controlled mode and the heat-transfer-limited mode. Intriguingly, the two bubble growth modes give rise to distinct droplet jumping behaviors characterized by constant velocity and constant energy schemes, respectively. This strategy allows the facile purging of wetting liquid drops on rough or structured surfaces in a controlled manner, inspiring promising applications in rapid removal of fouling even settled in surface cavities.
