摘要
应用热力学原理定量分析了植物水分异质成核的结冰机理:植物体微小空腔内的水分在结冰时,腔壁起着凝结核的作用,即存在异质成核结冰过程.水分异质成核的温度(即冰点) T与球形腔半径 R及冰水对墙壁的浸润性能的差异(用接触角θ表示)之间符合函数关系 T= T( R,cosθ).对于每一个cosθ值,当 R取某一确定值 R时,冰点达到最低值 Tm in, Tm in可达- 36 ℃.
The ice point of water in winter hardy plant by thermodynamic theory of heterogeneous nucleation is investigated quantitatively.When water in a small cavity of plant is frozen,the wall of the cavity can condense the nucleus.This freezing process is called heterogeneous nucleation.The nucleating temperature(i.e.ice point) T is determined by cavity radius R and contact angle θ which denotes surface wetting properties of the wall of the cavity.The relation between the T and R,θ can be showed by the function T=T(R, cos θ ).When θ is given,there is a certain cavity radius R * which can determine the lowest ice point T min ,the T min can be -36 ℃.
出处
《郑州轻工业学院学报》
CAS
1999年第3期71-74,共4页
Journal of Zhengzhou Institute of Light Industry(Natural Science)
基金
国家自然科学基金
河南省 1999 年基础研究计划项目