冷表面上水滴冻结过程的研究  

STUDY OF FREEZING PROCESS OF WATER DROPLET ON COLD SURFACE

作　　者：王皆腾[1] 刘中良[1] 勾昱君[1] 张新华[1] 程水源[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022

出　　处：《工程热物理学报》2007年第6期989-991,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划项目(No.G2005CB724201);国家自然科学基金项目(No.50376001);北京市自然科学基金项目(No.3073014);2006年北京市拔尖创新新人才选拔计划项目(No.20061D0501500186)

摘　　要：本文对冷表面上的水滴冻结过程进行了研究。用显微成像系统对该过程进行了现象观察,采用热电偶对水滴中心温度进行了测量.实验发现,水滴温度随冷表面温度下降而下降,稍低于0℃时没有显著相变.水滴温度继续降低到约-5℃时发生明显相变,同时,水滴中心温度迅速回升并维持在稍低于三相点温度,冻结锋面到达热电偶所在的水滴中心位置后又逐渐下降,直到非常接近冷表面温度。建立了该过程的数学模型并进行了数值模拟,结果与实验基本符合.Freezing process of water droplet on a cold surface is investigated in this paper. Microscope-video system is used to observe its phenomena. Thermocouple is used for the temperature measuring of the water droplet center. In our experiments, the temperature of water droplet decrease with the temperature of cold surface. When the temperature is slightly lower than 0℃, No obvious phase change is found. Obvious phase change occurs when the temperature of water droplet is about -5℃. The temperature of water droplet rises to and keeps at that slight lower than the triple point of water simultaneously. Subsequently it decreases to that almost equal the temperature of cold surface after the freezing front attains the location of thermocouple. A model of this freezing process is put forward. The results of numerical simulation base on this model are corresponding with the experimental.

关 键 词：结霜 过冷 水滴 相变 

分 类 号：TK124[动力工程及工程热物理—工程热物理]