制冷剂中冰晶生长的数值模拟  

Numerical Simulation of Ice Crystal Growth in Refrigerant

作　　者：邹阳[1] 钱华[1] 梁文清[1] ZOU Yang;QIAN Hua;LIANG Wenqing(School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《制冷技术》2017年第2期64-69,共6页Chinese Journal of Refrigeration Technology

基　　金：航天低温推进剂技术国家重点实验室开放课题资助项目(SKLTSCP1512)

摘　　要：制冷剂中含有水份会导致冰堵从而影响制冷系统的的正常工作。为探究水份在制冷剂中凝固的过程,根据凝固理论以及相场法,在微观尺度下对水的凝固过程进行研究。采用数值模拟的方法,研究了各向异性系数和过冷度对冰晶生长的影响。结果表明,各向异性系数大小对冰晶形貌大小有较大的影响,取值越大,冰晶的二次分枝越发达。同时过冷度也明显影响冰晶的生长和形貌,过冷度越大,冰晶生长速度越快,二次分枝越发达。模拟计算的冰晶生长结果与实际显微镜下观察结果较接近吻合。If there is water in the refrigerant,the water can become to ice crystal and lead to ice plug,which willaffect the normal work of the refrigeration system.To study the process of water solidify at micro scale level,solidification theory and phase field method are used.Numerical calculation is applied to study the process of icecrystal growth.The results show that the anisotropic coefficient has a great influence on the crystal morphology.When the anisotropic coefficient becomes bigger,the secondary dendritic branches of ice crystals arebetter-developed.Meanwhile,the sub-cooling degree also has a great effect on the growth process and shape ofice crystal.The higher the sub-cooling degree is,the faster the growing speed of ice crystal.The simulation resultsmatch well with the experimental results through microscope.

关 键 词：制冷剂 冰晶生长 数值模拟 

分 类 号：TB64[一般工业技术—制冷工程]