湿度差驱动下溶液蒸发冷冻过程中冰体的发展规律  

Icing evolution in process of liquor evaporation-refrigeration driven by humidity difference

作　　者：高蓬辉[1,2] 纪绍斌[1,2] 衡文佳[1,2] 周兴业[2] 周国庆[1,2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116

出　　处：《化工学报》2013年第8期2820-2826,共7页CIESC Journal

基　　金：国家自然科学青年基金项目(51106176);中国博士后面上基金项目(20110490042)~~

摘　　要：针对湿度(绝对湿度)差驱动下溶液的蒸发冷冻过程进行了分析研究,在热质平衡理论的基础上,考虑溶液表面冰体的形面变化特征,建立了蒸发冷冻过程中溶液表面冰体生长的热力学非稳态模型,分析了不同蒸发冷冻时刻,气-液界面间湿度(绝对湿度)差、气流速度以及气-液界面间质扩散对溶液表面冰体发展分布的影响,研究表明湿度(绝对湿度)差、气流速度和质扩散系数对溶液的蒸发冷冻作用明显。该理论模型及研究结果为强化湿度差驱动下溶液的蒸发冷冻及工程应用提供了理论指导和依据。Icing characteristic is important for refrigeration,freezing desalination and chemical engineering.A new freezing method is proposed in this paper,which is driven by humidity difference in 0℃ environment.The evaporation-refrigeration of liquor driven by absolute humidity difference in zero centigrade was studied.Based on heat and mass balance,an unsteady-state thermodynamic model was established with movement characteristic of icing on the surface of liquor,which could simulate icing development under different conditions.The effects of absolute humidity difference,airflow velocity and mass diffusion coefficient on icing development were analyzed.The results indicate that above factors have evident effects on the liquor evaporation-refrigeration.The model and results will provide a theoretical basis and guidance for liquor evaporation-refrigeration driven by absolute humidity difference and its applications.

关 键 词：蒸发冷冻 冰体 湿度差 

分 类 号：TK521[动力工程及工程热物理—热能工程]