摘要
通过系统地总结计算各种不溶表面上的成核能障,分析比较了冰晶在球面、平面和凹弧面上成核的难易。其中以球面上成核较难,凹弧面上成核较容易。异质核半径与新相核临界半径的比值大于10后,球面和凹弧面上成核都相当于平面上成核。想通过异质核表面形式来显著地影响新相成核,异质核半径与新相核临界半径的比值应在小于1的范围内。通过实验对比在结霜初期无液核生成时超疏水表面和普通表面上的结霜发现,此时超疏水表面不再具有延迟结霜的效果。
Nucleation of ice embryos on a planner,a convex surface and a concave surface are calculated,compared and analyzed systematically.The nucleation on a convex surface is harder, while the nucleation on a concave surface is relatively easier.When the ratio of the size of the foreign nucleus to the size of the critical nucleus of the new phase is larger than 10,there is no difference for different heterogeneous nucleation types of ice embryos.If significant influences on nucleation are expected of foreign surface characteristics,the above ratio should varies within the range 0 to 1.The experimental results show that,when there are no observable water drops develop at the early stage of frost formation,the hydrophobic surfaces have no anti-frosting performance.
作者
李丽艳
刘中良
赵玲倩
李艳霞
LI Li-Yan;LIU Zhong-Liang;ZHAO Ling-Qian;LI Yan-Xia(College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第1期198-203,共6页
Journal of Engineering Thermophysics
基金
北京市自然科学基金项目(No.3162007)
关键词
结霜
成核
疏水表面
frost formation
nucleation
hydrophobic surface
