文档介绍：网络出版时间:2012-09-13 14:43
网络出版地址:s/detail/
基于分形理论的翅片管气化器霜层导热系数
陈叔平,姚淑婷,谢福寿,韩宏茵,常智新1
(兰州理工大学石油化工学院,甘肃兰州 730050)
摘要:基于分形理论的 DLA 模型,数值模拟了翅片管气化器表面霜层生长过程,同时对霜层生长形态进行了实验观测,
得到了不同时刻的霜层生长图像。计算了气化器表面霜层剖面孔隙面积分布分形维数 d 与分形孔隙率ε,模拟图像与
实验图像的对比表明两者取得良好的一致,验证了数值模拟的合理性。在此基础上建立了霜层导热的分形模型,采用
热阻法给出了霜层导热系数表达式。计算结果表明,用该方法确定的霜层导热系数与实测得到的霜层有效导热系数值
域范围是相符的。并通过与其他导热模型的比较,验证了将剖面面积分布分形维数引入导热模型以确定霜层导热系数
的可行性,从而为霜层导热系数的理论研究开辟了一条新路。
关键字:翅片管气化器;霜层;导热系数;分形;数值模拟
中图分类号:TB61+1;; 文献标识码:A 文章编号:
Thermal conductivity of frost layer on finned-tube vaporizer based on
fractal theory
CHEN Shuping, YAO Shuting, XIE Fushou, HAN Hongyin, CHANG Zhixin
(College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Abstract: The numerical simulation of frost formation and growth on the surface of finned-tube vaporizer was
carried out based on Diffusion Limited Aggregation (DLA) model of fractal theory, and images of frost
formation and growth in various shapes at different stages were obtained by experimental observations in this
paper. The profile pore area distribution fractal dimension d and fractal porosity ε of frost layer on the surface of
vaporizer were calculated. The contrast between simulation results and experiments indicated that they agreed
well with each other, and it verified