| 摘要: |
| 超疏水表面能减少液滴的附着，减少液滴存在带来的热阻增加，提高空调、发电和海水淡化的效率。本文实验研究了不同冷表面温度(2~8 ℃)、空气湿度(40%~80%)、倾斜角度(0°~90°)下，超疏水表面冷凝液滴的生长特性，分析不同工况对超疏水表面凝露的影响。结果表明：随着冷表面温度的降低，液滴平均半径和表面液滴覆盖率逐渐增大，冷表面温度越低，液滴生长速率越快；在不同湿度工况下，高湿度下超疏水表面液滴生长较快，但随着时间增加，低湿度下液滴生长半径将超过中高湿度，并且低中湿度工况下冷表面液滴覆盖率远小于高湿度；随着倾斜角度增大，液滴临界扫掠半径逐渐减小，垂直表面相比水平表面液滴覆盖率减少42％。 |
| 关键词: 超疏水 凝露 液滴 液滴半径 表面覆盖率 |
| DOI： |
| Received:March 29, 2022Revised:May 02, 2022 |
| 基金项目:河南省自然科学基金（162300410112）、河南省教育厅基金（21A470003）和河南理工大学博士基金（No. B2021-37）资助。 |
|
| Condensation Characteristics of Superhydrophobic Surface at Different Working Conditions |
|
Gu Guiyu1, Sheng Wei1,2, Zheng Haikun1,2, Hao Xiaoru1, Wang Ruirui1
|
| (1.College of Mechanical and Power Engineering, Henan Polytechnic University;2.Hami Henan New Energy Industry Research Institute) |
| Abstract: |
| Superhydrophobic surfaces can reduce the attachment of droplets, reduce the increase of thermal resistance caused by the existence of droplets, and thereby improve the efficiency of air conditioning, power generation, and seawater desalination systems. This study experimentally investigates the growth characteristics of condensate droplets on a superhydrophobic surface under different cold surface temperatures (2–8 ℃), relative humidity values (40%–80%), and inclination angles (0°–90°) and analyzes the effects of different working conditions on superhydrophobic-surface condensation. The results show that with a decrease in the cold surface temperature, the average droplet growth radius and surface droplet coverage gradually increase. The lower the cold surface temperature, the faster the droplet growth rate. The droplets on the superhydrophobic surface grow faster under high humidity, while the droplet growth radius under low humidity will exceed that under medium and high humidity after sufficient time. The droplet coverage on the cold surface under low and medium humidity conditions is considerably less than that under high humidity conditions. The critical sweep radius of droplets decreases gradually with an increase in inclination angle, and the droplet coverage on the vertical surface decreases by 42% compared with that on the horizontal surface. |
| Key words: superhydrophobic condensation droplet droplet radius surface coverage |
