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液滴的快速脱落和移除对蒸汽滴状冷凝传热具有重要的影响,超疏水表面由丁二具有接触角大,接触角滞后小的优点而用于驱动冷凝液滴的自发运动,但是,常压蒸汽在超疏水表面冷凝时,液滴的润湿形态还没有定论。本文设计了超疏水疏水条纹间隔排列的超疏水一疏水组合表面,研究了常压蒸汽在组合表面上的冷凝过程,观测了液滴的运动特性,测量了超疏水一疏水组合表面上常压蒸汽冷凝传热性能。实验结果显示疏水区液滴在表面张力差的作用下从疏水区向超疏水区自发迁移,说明超疏水区液滴处于Wenzel润湿形态,超疏水一疏水组合表面蒸汽冷凝传热性能比完全超疏水和完全疏水表面传热性能的面积加权平均值大。说明液滴的自发迁移运动强化了疏水区的传热性能。
The rapid dropout and removal of droplets have an important effect on the condensation and heat transfer of steam droplets. The superhydrophobic surface is used to drive the spontaneous movement of condensate droplets because of its large contact angle and small contact angle hysteresis. However, Atmospheric pressure vapor in the super-hydrophobic surface condensation, the droplet wetting morphology is not conclusive. In this paper, superhydrophobic-hydrophobically-hydrophobic combination surfaces with superhydrophobic hydrophobic fringes arranged at intervals are designed. The condensation process of the atmospheric steam on the combined surface is studied. The movement characteristics of the liquid droplets are observed. Condensation heat transfer performance. The experimental results show that the droplets in the hydrophobic region spontaneously migrate from the hydrophobic region to the superhydrophobic region due to the difference in surface tension, indicating that the droplets in the superhydrophobic region are in a Wenzel wetting state, and the heat transfer performance of the superconducting- The area weighted average of the heat transfer properties of hydrophobic and fully hydrophobic surfaces is large. It shows that spontaneous migration of droplets strengthens the heat transfer performance of the hydrophobic region.