【作者】 梁彩华； 汪峰； 吕艳； 范晨； 张小松；

【Author】 Liang Caihua;Wang Feng;Lv Yan;Fan Chen;Zhang Xiaosong;School of Energy and Environment,Southeast University;

【机构】 东南大学能源与环境学院；

【摘要】 为研究翅片表面特性对空气源热泵结霜的影响,本文构建出翅片结霜实验平台,对接触角不同的四种翅片表面(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,凝结形成的水珠粒径越小,分布越稀疏,水珠开始凝固的时间越滞后;霜层生长过程中,接触角大的铝表面霜晶相对矮小且疏松,枝晶分布不均匀,而接触角较小的铝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,霜层的高度和表面温度增大,导热系数减小。接触角越大的表面其抑霜效果越明显。更多还原

【Abstract】 In order to study the effects of surface characteristic on frost formation of air source heat pump,the frosting experimental system was developed,visualization study was used to study the microscopic characteristics of frost formation on four different surfaces,the change rules of the thermal characteristic of frost layer and the microscopic characteristics of frost formation were obtained.Results show that during the period of frost crystal growth,the greater the surface contact angle is,the smaller the size of water droplet condensation on cold surface is,the sparser the drop size distribution is,and the later the water solidifies is;During the process of frost layer growth,frost crystal is relatively small,loose and uneven distribution on the hydrophobic surface,while the frost crystal is long,dense and evenly distribution on the hydrophilic surface;With the increase of contact angle,the height and surface temperature of the frost layer increase,and the coefficient of thermal conductivity decreases.The larger the contact angle of the hydrophobic surface is,the more obvious the frost suppression effect is.更多还原