空温式翅片管气化器结霜模型及数值模拟.pdf

低温与超导制冷技术 Cryo. & Supercond.
第 39 卷第 11 期 Refrigeration Vol. 39 No. 11
空温式翅片管气化器结霜模型及数值模拟
陈叔平,姚淑婷,谢福寿,常智新,韩宏茵
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兰州理工大学石油化工学院兰州 730050
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摘要以分形理论的 DLA 模型为基础建立了空温式翅片管气化器深冷表面上霜晶生长的二维模型模拟了深
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冷表面上的霜晶生长过程。采用计盒维数法对模拟出的霜晶生长图像进行了分形维数的计算结果表明深冷表面
上霜晶的分形维数较一般冷表面上的分形维数大,从而说明深冷表面上的霜晶具有更加复杂的结构,充满空间的
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能力更大。这对进一步理解空温式深冷翅片管气化器表面上霜层的生长机理探索有效的气化器抑霜除霜方法
提高气化器换热特性有重要的指导意义。
关键词翅片管气化器结霜模型分形数值模拟
Frost model and numerical simulation of air - heating fin - tube vaporizer
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Chen Shuping Yao Shuting Xie Fushou Chang Zhixin Han Hongyin
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College of Petrochemical Engineering Lanzhou University of Technology Lanzhou 730050 China

Abstract A two - dimentional model of frost formation and growth on the cryogenic surface of air - heating finned - tube va-
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porizer was proposed based on Diffusion Limited Aggregation DLA model and the simulation of frost formation and growth on
the cryogenic surface was carried out in this paper. The box counting dimension method was used to calculate the fractal dimen-
sion of the image of the frost formation and growth. The result showed that the fractal dimension of frost on the cryogenic surface
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was larger than the fractal dimension of frost on the general cold surface and frost on the cryogenic surface had a plex
structure and a bigger ability of filling space. It is more significant to further unders