表面接触角对初始霜晶生长影响的实验研究  

Experimental Study of Effect of Contact Angle on Initial Frost Growth

作　　者：黄玲艳[1] 刘中良[1] 勾昱君[1,2] 刘耀民[1] 

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100124 [2]唐山学院,河北唐山063000

出　　处：《工程热物理学报》2011年第3期473-476,共4页Journal of Engineering Thermophysics

基　　金：北京市科技计划项目(No.Z07020600290793)

摘　　要：本文通过化学刻蚀和表面氟化相结合的方法在铜片基体上制作了一系列具有不同接触角的疏水表面,水与疏水表面的接触角最高可达155.2°。显微观察了不同接触角冷表面上水珠的形成、冻结以及初始霜晶的生长,并与普通紫铜表面进行了对比。结果表明,普通紫铜表面上形成的水珠大且排列致密,而疏水表面上形成的水珠小且稀疏,呈球形,冻结时间晚。此外,疏水表面上形成的霜晶稀疏,较易去除。最后,从相变动力学理论分析了疏水表面延迟水珠冻结和霜晶生长的原因。A series of hydrophobic surfaces with different contact angles were fabricated by chemical etching and fluorination modification,the largest water contact angle was measured to be 155.2°. Comparative micro-observations of the water droplets formation,freezing process and frost crystals growth were carried out on both the hydrophobic surfaces and the plain copper surface under the same conditions.The experimental results showed that the water droplets condensed on the hydrophobic were smaller and present a more spherical shape when compared with that on the plain copper surface. The freezing time of the droplets on the hydrophobic surface was later than that on the plain copper surface.Moreover,the frost crystals formed on the hydrophobic surface were sparse and can thaw quickly.The mechanism of surface hydrophobicity influence on droplets frozen and frost formation was analyzed theoretically based on the phase transition theory.

关 键 词：接触角 疏水表面 霜晶 

分 类 号：TK124[动力工程及工程热物理—工程热物理]