针对滴状冷凝传热系数远高于膜状冷凝，减小液滴直径并及时脱离是提高冷凝传热的关键性问题。本项目提出采用亲/疏水两层结构表面协同排液，强化冷凝传热的构想,首先对符合冷凝传热及液滴动力学原理的结构表面进行构建、表征、及液滴动力学测量。然后以对流冷凝传热和液滴弹跳型反重力平板热管传热为载体，研究亲/疏水两层表面的各特征参数、亲/疏水性对减小液滴脱离直径，加速液滴移动，促进液滴吸入并转移排除，从而强化冷凝传热的影响和过程规律性，以及亲/疏水两层表面在冷凝传热中的功能协同及尺度匹配。建立液滴生长、液滴移动、液滴弹跳及液体吸入的数学模型并运用基于格子Boltzmann的耦合有限容积法进行数值模拟。实验与理论相互验证，揭示亲/疏水两层结构表面协同排液，强化冷凝换热的机理。本项目属于多学科交叉前沿领域，将材料的制备、改性与协同性引入到冷凝传热中，既为冷凝传热提供理论基础，又为新型紧凑式冷凝器的设计提供指导。

The heat transfer coefficient of dropwise condensation is much higher than that of film condensation. It is the key problem to improve condensation heat transfer by reducing the droplet diameter and discharging liquid in time. In this project, a scientific idea was proposed using two layer surfaces with hydrophilicity/hydrophobicity to enhance condensation heat transfer. First，in accordance with the principle of condensation heat transfer and droplet dynamics, the construction and characterization of surfaces, dynamics measurement of droplet on surfaces were conducted. Then convective condensation heat transfer and heat transfer characteristics of anti-gravity flat heat pipe with two layer surface were studied. The study focus on the regularity that how the structure parameters and wettability of surfaces affect condensation heat transfer, by reducing droplet diameter, accelerating liquid movement, promoting the inhalation and drainage of liquid. Functional coordination and scale matching of two layer surfaces were also explored in dropwise condensation. A mathematical model for droplet growth, droplet movement, droplet bounce and liquid suction is established, and the numerical simulation is carried out using the finite volume method based on lattice Boltzmann. Experiments and theories are verified each other to reveal the mechanism of the interaction between two layer surfaces and the condensation heat transfer. This project belongs to interdisciplinary frontier areas, in which the material preparation, modification and the cooperation were introduced. It will not only provide a theoretical basis for high efficient condensation heat transfer, but also provide guidance for the design of new type of compact condenser.