用分形理论对结霜过程的数值模拟研究  

NUMERICAL SIMULATION OF FROST FORMATION IN DIFFUSION LIMITED AGGREGATION

作　　者：吴晓敏[1] 江航[1] 莫少嘉[1] 王维城[1] 

机构地区：[1]清华大学热能工程系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2010年第12期2073-2075,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50476011)

摘　　要：初始霜晶在冻结的冰珠上产生,随着初始霜晶的生长分枝,枝晶上又不断长出枝晶,这一过程具有自相似性,具有分形生长的特征。本文应用分形理论中的有限扩散聚集(DLA)模型,建立了霜层初期生长过程模型,数值模拟分析了空气流速、冷表面不均匀性、表面接触角等对霜层生长过程的影响,得到了接触角越大霜层生长越慢等与理论分析及实验结果相符的数值模拟结果。Numerical simulation of frost formation and initial crystal growth were investigated with the use of fractal theory and the model of diffusion limited aggregation （DLA）. The effect of various factors such as air velocities, diversity of the cold surface and contact angle on frost formation were analyzed by numerical simulation. The numerical simulation results showed that the frost grew slower as the contact angle became larger and so on. These numerical simulation results were consistent with the experimental results.

关 键 词：结霜 表面接触角 分形理论 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]