| HU Chao,BAI Qing-shun,BAI Jin-xuan,ZHANG Qing-chun.Simulation Research of the Anti-icing Micro-structured Surface[J],45(9):145-153 |
| Simulation Research of the Anti-icing Micro-structured Surface |
| Received:April 06, 2016 Revised:September 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.09.023 |
| KeyWord:micro-structured surface hydrophobic anti-icing condensation rate FVM FLUENT |
| Author | Institution |
| HU Chao |
School of Mechanical Engineering, Harbin Institute of Technology, Harbin , China |
| BAI Qing-shun |
School of Mechanical Engineering, Harbin Institute of Technology, Harbin , China |
| BAI Jin-xuan |
School of Mechanical Engineering, Harbin Institute of Technology, Harbin , China |
| ZHANG Qing-chun |
School of Mechanical Engineering, Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| Objective To explore the hydrophobe and anti-icing character of surfaces with different micro-structures and the link between the two characters. Methods Based on FVM, simulations of the progress including water-drop falling onto the surface were done till its solidification. Firstly the model of surfaces with different micro-structures was established. Secondly, the differences between the hydrophobe of those surfaces were analyzed. Lastly, by comparing the different simulation results of the condensation progress on the surface with different micro-structures, the relationship between the hydrophobe and the anti-icing character was obtained and the reason of anti-icing character forming was disclosed. Results Contact angle of rectangle micro-structured surface was 109°, presenting hydrophobic character, while the contact angle was 162° on the zigzag micro-structured surface, presenting super-hydrophobic character. The condensation ratio of the droplets on zigzag micro-structured surface was lower than 2% after 20 ms, showing the best anti-icing character. The condensation ratio of normal surface was 4%, smaller than that of rectangle surface, which was 6%. Comparing the condensation progress of rectangle and normal surface, the turbulent force of the droplets on rectangle micro-structured surface was five times than that of normal surface. And after 20 ms, the temperature near the micro-structured wall reduced by 10 K, while it reduced by 30 K near the normal wall. Conclusion The micro-structured surface has the hydrophobic character. The hydrophobicity has both positive and negative effects on the anti-icing character. It can slow down the condensation speed on the initial stage. On the other hand, it can accelerate condensation speed after stable ice layer forms at the bottom of the droplet. |
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