| 混合润湿性图案化铜基表面冷凝换热性能研究 |
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| 引用本文： | 朱丹丹,许雄文,刘金平,卢炯. 混合润湿性图案化铜基表面冷凝换热性能研究[J]. 化工学报, 2021, 72(5): 2528-2546. DOI: 10.11949/0438-1157.20201302 |
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| 作者姓名： | 朱丹丹 许雄文 刘金平 卢炯 |
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| 作者单位： | 华南理工大学电力学院,广东广州510641;华南理工大学电力学院,广东广州510641;广东省能源高效清洁利用重点实验室,广东广州510640 |
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| 基金项目： | 国家自然科学基金项目(51976063);广东省自然科学基金项目(2019A1515011253) |
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| 摘 要： | 采用聚四氟乙烯纳米颗粒涂料在50 mm×100 mm铜基表面构造超疏水表面以及条纹图案混合润湿性表面。为探究条纹倾角对冷凝换热的影响，条纹与铜板宽度方向分别成90°与60°的混合润湿性表面被应用于实验中。实验结果表明，超疏水表面传热系数与混合润湿性表面冷凝传热系数随换热温差增大而增大。同时，和与冷凝液的脱落频率存在强相关关系，脱落频率越高，、越大。超疏水表面冷凝液脱落频率低，在0~20 K的换热温差范围内始终低于膜状凝结。混合润湿性表面能有效强化超疏水表面的冷凝换热，条纹倾角为60°的表面在为11.3 K时测得最高传热系数16.64 ，是超疏水表面传热系数的2.14倍；而条纹倾角为90°的表面在为13.8 K时测得最高冷凝传热系数13.63 ，是超疏水表面传热系数的1.68倍。
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| 关 键 词： | 凝结 传热 聚四氟乙烯 纳米粒子 织构 超疏水 混合润湿性表面 |
| 收稿时间： | 2020-09-10 |
Characteristic of condensation heat transfer of hybrid wettable patterned copper surfaces |
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| ZHU Dandan,XU Xiongwen,LIU Jinping,LU Jiong. Characteristic of condensation heat transfer of hybrid wettable patterned copper surfaces[J]. Journal of Chemical Industry and Engineering(China), 2021, 72(5): 2528-2546. DOI: 10.11949/0438-1157.20201302 |
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| Authors: | ZHU Dandan XU Xiongwen LIU Jinping LU Jiong |
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| Affiliation: | 1.School of Electric Power Engineering，South China University of Technology, Guangzhou 510641, Guangdong, China;2.Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510640, Guangdong, China |
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| Abstract: | The study uses PTFE nanoparticle coatings to construct a super-hydrophobic surface and a striped pattern mixed wettable surface on a 50 mm×100 mm copper-based surface. In order to explore the influence of the inclination angle of the stripes on the condensation heat transfer, a mixed wettable surface with stripes and the width direction of the copper plate at 90° and 60° was used in the experiment. Besides, the width of the hydrophilic region and superhydrophobic region were both set to 1 mm, and the proportion of hydrophilic area were 48.8% and 48.7% respectively corresponding to the above-mentioned hybrid wettable surfaces. The condensation phenomena were recorded by a high-speed camera (Phantom, Miro Ex4). Dropwise condensation (DWC) was achieved on the super hydrophobic surface and superhydrophobic region of the hybrid wettable surfaces, while filmwise condensation (FWC) was observed on the hydrophilic region of the hybrid wettable surfaces. The result of the experiment indicated that the condensation heat transfer coefficient (HTC) of the super hydrophobic surface and the hybrid wettable surfaces has a strong correlation with the droplet departure rate and surface renewal. The faster the droplet departure rate is, the higher the condensation heat transfer coefficient will be. Moreover, due to the coarse textures of the superhydrophobic surface, the wetting model of droplets formed on the superhydrophobic surface tended to represent the Wenzel wetting model. As a result, the droplet departure rate and HTC of the superhydrophobic surface was lower than FWC when the condensation heat transfer temperature difference was in the range of 0—20 K. However, the hybrid wettable surfaces were able to enhance the HTC of the superhydrophobic surface by increasing condensation surface renewal owing to the liquid bridge departure. The highest HTC of 16.64 and condensation heat flux of 188 when was 11.3 K were observed on the hybrid wettable surface (60°-parallel-stripes pattern), whose HTC was 2.14-fold compared with that of the superhydrophobic surface. While an HTC of 13.63 which was 1.68-fold compared with that of the superhydrophobic surface was observed on the hybrid wettable surface (90°-parallel-stripes pattern) when was 13.8 K. |
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| Keywords: | condensation heat transfer PTFE nanoparticle fabrication superhydrophobic hybrid wettable surface |
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