过冷水滴液-固相变动力学特性研究  

Investigation on Solid-liquid Phase Change Kinetics of Supercooled Water Droplets

作　　者：杜雁霞[1] 桂业伟[1] 肖春华[1] 李军[1] 

机构地区：[1]中国空气动力研究与发展中心,绵阳621000

出　　处：《制冷学报》2008年第4期30-33,共4页Journal of Refrigeration

基　　金：国家自然科学基金资助项目(10672174)~~

摘　　要：采用非等温DSC法,对过冷条件下水滴的液-固相变动力学特性进行了研究,获得了水滴结晶过程的速率常数、时间指数和Avrami指数。研究表明,降温速率对水的结晶行为影响较大。降温速率越大,则结晶速率越大,结晶峰温和结晶初始温度向低温方向移动,结晶的完善程度相对越差。在-40℃～0℃温度范围,水滴的结晶以异相成核的三维球晶方式生长。The non-isothermal crystallization behavior and kinetics of supercooled water droplets were investigated by means ot me differential scanning calorimetry （DSC） method and the rate constant, time index and Avrami index of crystallization were obtained. The results show that the cooling rate has great influence on the crystallization behavior of water. The crystallization rate increases and the initial temperature and peak temperature of crystallization decrease with the increase of the cooling rate. In the temperature range of-40℃-0℃, the crystallization exhibits three-dimensional spherulitic growth on heterogeneous nuclei.

关 键 词：工程热物理 过冷水滴 液-固相变 DSC法 结晶 动力学 

分 类 号：TB611[一般工业技术—制冷工程] TK121[动力工程及工程热物理—工程热物理]