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。
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 introduced 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.
出处
《中国科学院研究生院学报》
CAS
CSCD
2004年第1期26-32,共7页
Journal of the Graduate School of the Chinese Academy of Sciences
关键词
滴状冷凝
网格状高分子
MD
核化中心位
dropwise condensation, polymer network, MD, nucleation center site
