本项目基于人工核化点强化冷凝液滴成核和超疏水梯度表面促进冷凝液滴排出两个过程对冷凝换热的协同促进作用，采用理论分析与实验研究相结合方法进行研究。提出采用人工亲水核化点增加液滴成核密度，研究人工核化点润湿性能、尺度及布置与液滴成核密度间关系，得到人工核化点润湿性能、跨尺度及多尺度人工核化点及核化点分布对强化冷凝液滴成核的影响机理；同时建立超疏水梯度表面冷凝液滴运动数学模型，研究通过梯度表面加速液滴运动的规律，获得表面结构形态、尺度等多参数对液滴运动的耦合作用机理；在此基础上，实验研究人工核化点和超疏水梯度表面共同作用下，冷凝液滴成核与运动行为，揭示人工核化点的尺度、润湿性能、布置及超疏水表面结构的形态、尺度等对强化冷凝液滴成核与排出的协调作用机制，提出基于表面结构尺度、形态、润湿性能及布置等可控参数的促进冷凝液滴成核与排出的表面设计准则，研制一种能强化冷凝换热的人工核化点超疏水混合梯度表面。

This project is based on the synergetic role of artificial nucleation sites in enhancing the condensing droplet nucleation and the superhydrophobic gradient surface to promote the condensation droplet discharge. Theoretical analysis and experimental research are combined to carry out the research. Artificial hydrophilic nucleation sites were used to increase the nucleation density of the droplets. Relationship between wetting performance, scale and arrangement of artificial nucleation sites, and the nucleation density of the droplets could be investigated. Mechanism of condensation nucleation density enhancement by the wetting performance, scale, and multi-scale of artificial nucleation sites were obtained. Meanwhile, a mathematic model for the droplet movement on super-hydrophobic gradient surface condensation was established. The law of accelerating the movement of droplets through gradient surfaces could be studied, and the coupling mechanism of multiple parameters such as surface morphology and scale on the movement of droplets were obtained. On this basis, experiments were conducted to study the nucleation and movement behavior of condensation droplets under the combined action of artificial nucleation sites and super-hydrophobic gradient surfaces, revealing the synergetic mechanism of the droplet nucleation and discharge by the parameters such as artificial nucleation sites moisture properties, arrangement, placement and the superhydrophobic surface structures and scale. The surface design criteria to promote the nucleation and discharge of condensate droplets based on controllable parameters such as the scale, morphology, wetting properties, and arrangement of the surface structure are proposed. Finally, this project developed a superhydrophobic gradient surface with artificial nucleation sites that can enhance condensation heat transfer.