拱形铜片试样表面的结霜过程

›› 2012, Vol. 42 ›› Issue (05): 1168-1172.

拱形铜片试样表面的结霜过程

金敬福, 李微微, 陈廷坤, 丛茜

吉林大学生物与农业工程学院, 长春 130022

收稿日期:2011-10-25 出版日期:2012-09-01 发布日期:2012-09-01
通讯作者: 丛茜(1963-),女,教授,博士生导师.研究方向:工程仿生学.E-mail:congqian@jlu.edu.cn E-mail:congqian@jlu.edu.cn
基金资助:
国家自然科学基金青年基金项目 (51005095);吉林省科技发展计划青年基金项目(20100187);教育部博士点基金新教师基金项目(20090061120071).

Frosting process of arched copper surface

JIN Jing-fu, LI Wei-wei, CHEN Ting-kun, CONG Qian

College of Biological and Agricultural Enginnering, Jilin University, Changchun 130022,China

Received:2011-10-25 Online:2012-09-01 Published:2012-09-01

摘要/Abstract

摘要： 用显微镜观察了作为冷表面的铜片在降温过程中其表面的结霜规律。为了避免试样边缘的霜层生长对观察区域的影响,把试样弯曲成拱形观察其拱峰处的结霜现象。试验表明,初始霜层的形成和后续霜层的生长速率不同。霜层生长过程中除了表面霜枝的回融现象外,外层霜层出现周期性的整体塌陷现象。分析认为,初始霜层的滋生点分布和密度是引起霜层生长速率不同的根源,霜层塌陷是初始松散霜层回融再重组的结果。

关键词: 传热传质, 冷表面, 结霜, 生长速率, 显微观察

Abstract: The frosting behavior in the cooling process of the copper flake specimen as cold surface was observed microscopically. In order to avoid the obstacle of the frost layer growth at the specimen edge to the observing area, the specimen was bent to an arch to observe the frosting phenomena at the arch apex. The experiments showed that the initial rate of the frost layer formation is different from the subsequent growth rate. In the frost layer growth process, in addition to the melt-back phenomenon of the surface frost branches, there were periodic overall collapse of the outer frost layer. Analysis suggested that the breeding point distribution and density of the initial frost layer are the origins of difference of the frost layer growth rates, and the collapse of the frost layer is the result of the melt-back and recomposition of the initial loose frost layer.

Key words: heat and mass transfer, cold surface, frost formation, growth rate, microscopic observation

中图分类号:

TK124

金敬福, 李微微, 陈廷坤, 丛茜. 拱形铜片试样表面的结霜过程[J]. , 2012, 42(05): 1168-1172.

JIN Jing-fu, LI Wei-wei, CHEN Ting-kun, CONG Qian. Frosting process of arched copper surface[J]. , 2012, 42(05): 1168-1172.

参考文献

[1] 吴晓敏,单小丰,王维城,等. 冷表面结霜的微细观可视化研究[J].清华大学学报:自然科学版,2003,43(10):1437-1440. Wu Xiao-min, Shan Xiao-feng,Wang Wei-cheng, et al. Meso-scale visual observation of frost formation on cold surfaces[J].J Tsinghua Univ ( Sci &Tech), 2003,43 (10): 1437-1440.
[2] Hayashi Y, Aoki A, Dachi S A, et al. Study of frost properties correlating with rost formation types[J]. Journal of Heat Transfer, 1977, 99: 239-253.
[3] Tao Y X, Besant R W, Mao Y. Characteristics of frost growth on a flat plat during the early growth period[J]. ASHRAE Transactions, 1993, 99(1):746-753.
[4] Smith R V, Edmonds D K, Brentari E G F, et al. Analysis of frost phenomena oncryo-surface[J]. Advances in Cryogenic Engineering, 1963,9: 88-97.
[5] 张海英,梁栋.结霜与微尺度表面特性的实验研究[J].广州大学学报:自然科学版,2004,3(6):564-567. Zhang Hai-ying, Liang Dong. Experimental study on frost formation and the meso-scale surface feature[J]. Journal of Guangzhou University(Natural Science Edition), 2004,3(6): 564-567.
[6] Okoroafor E U, Newborough M. Minimizing frost growth on cold surfaces exposed to humidair by means of cross-linked hydrophilic polymeric coatings[J]. Applied Thermal Engineering,2000,20: 737-758.
[7] Liu Z L, Gou Y J, Wang J T, et al. Frost formation on a super-hydrophobic surface under natural convection conditions[J]. International Journal of Heat and Mass Transfer, 2008, 51: 5975-5982.
[8] Kondepudi S N, O'Neal D L. Effects of different fin configuration on the performance of finned-tube Heat exchanger under frosting conditions[J]. ASHRAE Transactions, 1990,96(2): 439-444.
[9] Makkonen Lasse,Laakso Timo,Marjaniemi Mauri ,et al. Modelling and prevention of ice accretion on wind turbines[J]. Wind Engineering,2001,25(1):3-21.

Metrics

Viewed

Full text

205

HTML			PDF

Just accepted	Online first	Issue	Just accepted	Online first	Issue
0	0	0	0	0	205

Abstract

Cited

Shared

Discussed