过冷却器结冰影响机制的实验  

Experimental Study on the Influence Mechanism of Icing in Supercooler

作　　者：于航[1] 詹光毅 孟二林[2] 赵美[1] 

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]苏州科技学院环境科学与工程学院,苏州215009

出　　处：《同济大学学报（自然科学版）》2015年第9期1395-1399,共5页Journal of Tongji University:Natural Science

摘　　要：从经典形核理论入手分析了过冷却器结冰的影响因素.在此基础上,搭建了过冷法制备冰浆实验台,通过大量实验对过冷水在过冷却器内结冰过程展开研究,结合边界层理论初步探究了流动与换热过程对过冷却器结冰的影响机制.实验结果表明:过冷水形核过程受换热壁面温度与流体扰动的共同影响;当雷诺数Re较小或二次冷媒温度较低时的形核主要受换热壁温影响;当Re数较大时的形核主要受到流体扰动的影响.This paper analyzed the factors that affect the freezing process in supercooler based on the classical nucleation theory. An ice slurry experiment bench was set up to survey freezing process in the supercooler. The impact mechanism of flow and heat transfer in supercooler was explored preliminarily, combining with boundary layer theory. The experimental results show that the supercooled water nucleation process is influenced by heat surface temperature and the disturbance of fluid. The nucleation is mainly affected by heat surface temperature when the Re number is small or secondary refrigerant temperature is low. Otherwise, the nucleation is mainly affected by the fluid disturbance when the Re number is large.

关 键 词：过冷法 过冷却器结冰 流动与换热 实验研究 

分 类 号：TK02[动力工程及工程热物理]