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中国科学院大学学报 ›› 2004, Vol. 21 ›› Issue (1): 26-32.DOI: 10.7523/j.issn.2095-6134.2004.1.004

• 论文 • 上一篇    下一篇

在金属表面络合网格状高分子膜实现滴状冷凝的MD模拟研究

梁世强, 徐靖中   

  1. 中国科学院工程热物理研究所,北京 100080
  • 收稿日期:2003-01-03 修回日期:2003-02-17 发布日期:2004-01-10

Molecular Dynamic Study of Dropwise Condensation on the Metal Surface Coated by a Monolayer Polymer Network

Liang Shi-qiang, Xu Jing-zhong   

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-01-03 Revised:2003-02-17 Published:2004-01-10

摘要:

提出了在铜表面络合上一种网格状高分子膜来实现水蒸汽滴状冷凝的新模型。预计这种单分子层的高分子膜可以被大片的配位键牢牢地粘附在金属表面上,并具有可自修复的特性,因而可望获得超长使用寿命和较高传热效率的滴状冷凝表面。根据相关的成膜或成滴的判据,用分子动力学模拟方法计算了水分子的内聚能和表面的吸附能。结果表明,在这种网格状高分子膜的表面上可以实现滴状冷凝。并且,通过观察粒子的平衡位型分布,可以看到网格状高分子中的大环结构可能起到核化中心位的作用。

关键词: 滴状冷凝, 网格状高分子, MD, 核化中心位

Abstract:

By complexing a kind of polymer network onto the copper surface,a new model of dropwise condensation for water vapor is proposed. It is contended that the monolayer spread film can be tightly attached to the metal surface by a number of coordination bonds and can be self- repairable,so that longer duration and higher heat transfer efficiency may be anticipated.A criterion of dropwise or filmwise condensation was in-troduced and MD simulations were carried out to calculate the cohesive energy of water and adsorptive energy of surface. The results indicate that dropwise condensation can occur on the polymer network surface,and the particle configurations indicate that the big rings of the network may play the role of nucleation center sites.

Key words: dropwise condensation, polymer network, MD, nucleation center site

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