过冷器表面冰层分离模型研究  

Investigation on Modelling the Ice Separation on Supercooling Surface

作　　者：蔡玲玲[1] 米沙[1] 刘志强[1] CAI Ling-Ling;MI Sha;LIU Zhi-Qiang(School of Energy Science and Engineering, Central South University, Changsha 410083, China)

机构地区：[1]中南大学能源科学与工程学院,长沙410083

出　　处：《工程热物理学报》2019年第5期1160-1168,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51676209);中南大学中央高校基本科研业务费专项资金资助(No.2017zzts170)

摘　　要：本文对过冷表面冰层黏附力和分离力的理论进行了分析。分析结果表明:利用流体扰动来防止过冷壁面冰层厚度的增大时,应满足分离力足够剥离黏附在壁面的冰晶和冰层,且冰晶冰层分离速率不小于其生长速率。并由此理论分别建立了三个阶段的冰层分离模型;而在冰层生长的第三阶段,冰层分离率不小于冰层生长速率可实现冰层厚度不持续增长,此时在一定的过冷度条件下,存在临界剪切力,当流体剪切力大于临界值时,冰层厚度不会持续增长,因此不会引发冰堵问题;过冷壁面零冰层条件为冰层生长的第一阶段冰层能及时剥离,在一定的壁面条件下,存在临界流速,当流体流速大于临界值时,冰层能及时剥离,壁面不会出现冰层,可实现系统的高效运行.The theory of the adhesion and separation force of supercooling surface is analyzed in this paper. the results of analysis indicate that: when prevent the growth of ice thickness in supercooling surface by fluid’s disturbance, the separating force can strip the ice, and separation rate of the ice is not less than the growth rate. And the separation conditions of the three stages are established respectively. When separation rate of the ice is not less than the growth rate in third stage, which can realize ice layer unsustainable increase. This moment, there is a critical shear force under certain supercooling conditions, when the fluid shear force is greater than the critical value,the ice layer unsustainable increase, which wouldn’t cause ice blockage. The zero-ice layer conditions in supercooling is that the ice can be stripped instantly at the first stage, when the flow velocity is greater than critical velocity in certain conditions, the ice can be can be stripped instantly, there is not ice layer in the surface, which can realize efficient operation of the system.

关 键 词：过冷表面 冰层剥离 冰堵 零冰层 

分 类 号：TK02[动力工程及工程热物理]