疏水冷面霜晶生长的有限扩散凝聚模型_雷洪.pdfVIP

第33卷第11期 东 北 大 学 学 报 ( 自 然 科 学 版 ) Vol. 33, No. 11 2 0 12 年 11 月 Journal of Northeastern U niversity( Natural S ien e) N ov. 2 0 1 2 雷 洪, 乔 娜, 耿佃桥, 张红伟 ( , 110819) : , , ; # , , # ; , 1144~ 11 78, ; # # : ; ; ; ; : T B 69 : A : 1005-3026( 20 12) 11- 159 1-04 DLA Model for Frost Crystal Growth on Hydrophobic Cold Surface L EI H ong , QIA O N a, GEN G D ian-qiao, ZHA N G H ong-w ei ( Key Laboratory of Ele tromagnet i Pro essing of Materials, Ministry of Edu ation, Northeastern University, Shenyang 110819, China. Corresponding author : LEI Hong, E-mail: leihong @ epm. neu. edu. n) Abstract: On the base of DLA ( Diffusion-Limited Aggregation) model, a two-dimensional mathemati al model w as developed to des ribe the frost rystal grow th on the hydrophobi old surfa e in order to have a deep insight into the dynami grow th pro ess of frost rystal. In this model, the surfa es w ith different i e beads were used to simulate the different hydrophobi surfa es, and the metal surfa e w as overed w ith i e beads. The movement of the w ater-vapor mole ule was des ribed by the parti le. s movement in the grid-nodes, and the probability for the parti le to move at ea h dire tion w as the same. Numeri al results show ed that the predi ted frost dynami grow th pro ess of frost rystal onforms to the ex isted experimental result . The predi ted dendriti frost rystal has the fra tal stru ture, and its fra tal dimension is between 1144 and 1178. Su h results are in good agreement w ith the experimental data. Th