CAJ | 학술논문

为研究翅片表面特性对空气源热泵结霜的影响，构建了翅片结霜实验平台，对接触角不同的4种翅片表面（亲水性铝翅片、普通铝翅片、疏水性铝翅片、超疏水性铝翅片）的结霜过程细微观特征进行了可视化研究，获得了翅片表面特性对结霜过程细微观物理特征及霜层热工特性的影响规律。结果表明，在霜晶生长初期，接触角越大，凝结形成的液滴粒径越小，分布越稀疏，液滴开始冻结的时间越滞后。霜层生长过程中，接触角大的表面霜晶相对矮小且疏松，枝晶分布不均匀，而接触角小的表面霜晶纤长且致密，枝晶多且分布均匀。随着接触角的增大，霜层的高度和导热系数减小，表面温度降低。超疏水性表面霜高比亲水性表面减少了45％，接触角越大的表面其抑霜效果越明显。
위연구시편표면특성대공기원열빙결상적영향，구건료시편결상실험평태，대접촉각불동적4충시편표면（친수성려시편、보통려시편、소수성려시편、초소수성려시편）적결상과정세미관특정진행료가시화연구，획득료시편표면특성대결상과정세미관물리특정급상층열공특성적영향규률。결과표명，재상정생장초기，접촉각월대，응결형성적액적립경월소，분포월희소，액적개시동결적시간월체후。상층생장과정중，접촉각대적표면상정상대왜소차소송，지정분포불균균，이접촉각소적표면상정섬장차치밀，지정다차분포균균。수착접촉각적증대，상층적고도화도열계수감소，표면온도강저。초소수성표면상고비친수성표면감소료45％，접촉각월대적표면기억상효과월명현。
In order to study the effect of the surface characteristic of fin on frost formation of an air source heat pump, a frosting experimental system for fin was developed.The microscopic character-istics of frost formation of four different fin surfaces with different contact angles were investigated visually.The effect laws of the surface characteristic of fin on the microscopic characteristics of frost formation and the thermal performances of frost layer were obtained.The experimental results show that the sizes of condensate water droplets are smaller, the distribution is sparser and the freezing time of water droplets is longer on the fin surface with bigger contact angle during the initial period of frost crystals growth.During the process of frost layer growth, frost crystals are relatively small, loose and unevenly distributed on the fin surface with big contact angle, while they are long, dense and evenly distributed on the fin surface with small contact angle.The height, surface temperature and thermal conductivity of the frost layer all decrease with the increase of the contact angle.The height of the frost layer of the superhydrophobic surface decreases by 45%compared with that of the hydrophilic surface.The anti-frosting performance is better when the contact angle of the fin surface is bigger.