格子-Boltzmann方法模拟霜结晶生长  

Frost crystal growth simulation by lattice Boltzmann method

作　　者：龚建英[1] 孙金绢[1] 李国君[1] 

机构地区：[1]西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室,西安710049

出　　处：《低温工程》2013年第4期10-13,28,共5页Cryogenics

基　　金：国家自然科学基金项目(51106013;50806059);中国博士后科学基金(2012M511998)

摘　　要：为了研究冷壁面上霜结晶的生长过程以及各参数的变化规律,利用格子-Boltzmann方法(LBM)方法,建立一个二维介观模型,实验验证了模型的可靠性,分析了霜层温度变化和密度增长规律,并直观模拟出霜结晶凝聚变化过程。结果表明:霜层表面温度在早期阶段迅速增加,但增加率随着结霜时间增加而减小;霜层内部温度随霜层厚度的增加呈线性增长;霜层平均密度随结霜时间增加呈现出先慢后快的规律;随着结霜过程的进行,由于越往上,霜晶体积分数越小,导致霜层内部密度随霜层厚度的上升而减小。In order to calculate the frost crystal growth process on a cold flat surface and study the vari- ation laws of parameters, a two-dimensional mesoscopic model was proposed based on LBM. The predicted results were found to be in good agreement with the data reported in the literatures. This simulation was con- cerned with temperature and density variation of the frost. The results show that the surface temperature in- creases rapidly in the early-stage, but the increase rate decreases with frosting. In addition, the interior temperatures rise in a linear curve with increase of the frost layer thickness. The average frost layer density increases with increasing frosting time. It was also found that the nearer the frost layer gets to the cold flat surfaces the higher the frost density is.

关 键 词：格子-BOLTZMANN方法 冷壁面 霜结晶 

分 类 号：TB611[一般工业技术—制冷工程] TK121[动力工程及工程热物理—工程热物理]