排液乳突与条纹相结合表面强化蒸汽冷凝传热  

Enhancement of Steam Condensation Heat Transfer on the Mastoid-stripe Bilayer Surface

作　　者：尤天伢 纪献兵[1,2] 郭浩[1] 甘园园 苗政[1,2] YOU Tianya;JI Xianbing;GUO Hao;GAN Yuanyuan;MIAO Zheng(Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization,North China Electric Power University,Beijing 102206;Key Laboratory of Power Station Energy Transfer Conversion and System,Ministry of Education,North China Electric Power University,Beijing 102206)

机构地区：[1]华北电力大学低品位能源多相流与传热北京市重点实验室,北京102206 [2]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《机械工程学报》2023年第24期156-163,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金(52176154,51776064);中兴通讯有限公司产学研合作论坛资助项目。

摘　　要：为了强化蒸汽冷凝传热,基于协同排液思想,设计并制备一种乳突+条纹双层结构表面:一层为超亲水乳突表面,另一层为亲水-超疏水条纹表面。在纯蒸汽环境中进行了冷凝传热试验,结果表明,条纹表面对冷凝传热过程具有一定的强化能力,当过冷度为7.0 K时,条纹表面的冷凝传热系数为光滑铜表面的1.39倍。而增加排液乳突可获得更好的冷凝传热性能,相同工况下,冷凝传热系数可提高到光滑铜表面的2.14倍。利用高速摄影仪对不同表面上冷凝液滴的形成和运动过程进行了可视化研究,并进行了受力分析,研究发现,条纹表面和乳突表面均对液滴具有一定的驱动作用,在乳突+条纹表面的综合驱动作用下,超疏水区的冷凝液滴迅速脱离,极大地降低了冷凝热阻,强化了冷凝传热。To strengthen the heat transfer of pure steam condensation,based on the idea of cooperative drainage,a bilayer surface of mastoid+stripe is designed and prepared:one layer was a superhydrophilic mastoid surface,and the other is a hydrophilic-superhydrophobic stripe surface.Condensation heat transfer experiments are conducted in a pure steam environment.The results show that the striped surface strengthen the condensation heat transfer performance.As the subcooling degree is 7.0 K,the condensation heat transfer coefficient is 1.39 times that of a smooth copper surface.However,the mastoid+stripe bilayer surface has a better heat transfer performance,the condensation heat transfer coefficient can be increased to 2.14 times that of smooth copper surface under the same working conditions.To acquire the mechanism of enhancing condensation heat transfer performance,a series of visualization experiments and force analysis are carried out.It is found that the condensation droplets in the superhydrophobic area could be quickly separated by the driving force from the mastoid+streak surface.Therefore,the condensation heat resistance is greatly reduced and the corresponding condensation heat transfer is greatly enhanced.

关 键 词：协同排液 表面张力 冷凝传热 双层表面 润湿性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]