Abstract In-situ hydrodynamic behavior of wicked liquid comes from interfacial dynamics at triple contact line, resulting in receding motion around expanding dry spot. We here introduce a new and creative technique of wicking experiment adopting an external pressure source equivalent to bubble nucleation pressure in order to investigate the receding behavior of wicked liquid. On the various types of surface morphology including smooth, nanostructure, nanoporous, and microstructure, it was clearly observed that wicked liquid receded from expanding dry area except for a smooth surface. The receding velocity was slower at microstructure, nanoporous, and nanostructure, in order. Clearly this result provides a hydrodynamic evidence of smaller dry area size and contact line length on microscale structure than on nanoscale structure. Moreover, the diameter of dry area showed a linear relation with CHF enhancement that indicates smaller diameter of dry area is more effective to delay irreversible expansion of dry spots. This novel observation is expected to provide reliable analysis of contact line dynamics with CHF enhancement on wicking-dominant surfaces.

中文翻译：

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负责临界热通量增强的后退芯吸液体的新测量

摘要 芯吸液体的原位流体动力学行为来自三重接触线的界面动力学，导致围绕扩大的干斑的后退运动。我们在这里介绍一种新的和创造性的芯吸实验技术，采用等效于气泡成核压力的外部压力源，以研究芯吸液体的后退行为。在包括光滑、纳米结构、纳米多孔和微结构在内的各种表面形态上，可以清楚地观察到吸液从扩大的干燥区域中退去，除了光滑的表面。后退速度依次在微观结构、纳米多孔和纳米结构处较慢。显然，该结果提供了微米级结构上比纳米级结构上更小的干燥区域尺寸和接触线长度的流体动力学证据。而且，干区直径与 CHF 增强呈线性关系，说明干区直径越小，越能有效延缓干点不可逆扩展。预计这种新颖的观察将提供可靠的接触线动力学分析，并在芯吸主导表面上增强 CHF。