Straight and curved hydrophilic microfinned surfaces are prepared in this work by photolithography and sputtering coating techniques using silicon wafers as substrates. The behavioral characteristics of drops on these surfaces are discussed by using image-processing technology. The experimental results show that when a drop is placed on the straight microfinned surface, the front contact line of the drop can move, while the rear contact line remains fixed. On the curved microfinned surface, however, both the front and the rear contact line can move. The drop can be self-propelled directionally from the region with larger roughness to the region with smaller roughness. The characteristics of velocity and acceleration on both surfaces are analyzed. A theoretical model is proposed by analyzing the energy conversion and compared with the experimental results. This study provides a novel microstructured surface for enhancing the heat-transfer performance of condensers.

中文翻译：

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亲水性微鳍表面上的自行式滴落

在这项工作中，使用硅晶片作为基板，通过光刻和溅射涂层技术制备了直的和弯曲的亲水性微翅片表面。通过使用图像处理技术讨论了这些表面上的液滴行为特征。实验结果表明，当将水滴放置在直的微鳍表面上时，水滴的前接触线可以移动，而后接触线保持固定。然而，在弯曲的微鳍表面上，前接触线和后接触线都可以移动。水滴可以从粗糙度较大的区域定向自推进到粗糙度较小的区域。分析了两个表面的速度和加速度特性。通过分析能量转换并与实验结果进行比较，提出了一个理论模型。本研究为提高冷凝器的传热性能提供了一种新型微结构化表面。