金属基超亲水/超疏水复合结构表面滴状冷凝特性和强化机理研究

针对传统超疏水表面在高过饱和度条件下容易被快速成核的冷凝液淹没而导致冷凝传热系数低的难题，本项目开展超亲水/超疏水复合结构表面的滴状冷凝特性和强化机理研究。研究基于光纤激光烧蚀技术制备金属基超亲水/超疏水相间复合结构表面的方法，阐明表面结构特征与表面润湿性能之间的关系；研究高过饱和度条件下不同亲疏水复合结构表面上的动态冷凝过程，揭示冷凝液滴成核密度、脱落频率、弹跳速度与表面特性之间的变化规律；实验研究复合结构表面的冷凝传热性能，厘清结构表面滴状冷凝传热的强化特性；建立结构表面滴状冷凝传热的物理模型，揭示超亲水/超疏水复合结构表面滴状冷凝传热的强化机理。本项目的研究将深化对结构表面冷凝换热机理的认识，对开发高效滴状冷凝换热设备有着重要的学术意义。

Regarding the problem of low heat transfer coefficient of conventional superhydrophobic surfaces at high supersaturations due to surface flooding as a result of fast nucleation of condensate droplets within the structures, this proposal presents the investigation of dropwise condensation characteristics and enhancement mechanism on hybrid superhydrophilic/superhydrophobic surfaces. The fabrication process of metal-based superhydrophilic/superhydrophobic surfaces using fiber laser-ablation technique will be developed, the relationship between surface structures and surface wettability will be clarified; the dynamic condensation processes on various hybrid surfaces at high supersaturations will be investigated to reveal the variations of condensate droplet nucleation density, departure frequency, jumping speeding to the surface geometry; the heat transfer performances of hybrid surfaces will be experimentally studied to clarify the enhanced dropwise condensation characteristics on structured surfaces; the physical model of dropwise condensation on structured surfaces will be established to understand the underlying enhancement mechanism of dropwise condensation heat transfer on hybrid superhydrophilic/superhydrophobic surfaces. Implementation of this project will not only advance our in-depth understanding of the heat transfer mechanism on structured surfaces, but also provide great academic significance to develop high efficient dropwise condensation heat transfer devices.