自然对流下重力对简单冷表面微观动态结霜特性影响的实验研究

doi:10.19784/j.cnki.issn1672-0172.2022.05.011

家电科技 ›› 2022, Vol. 0 ›› Issue (5): 71-75.doi: 10.19784/j.cnki.issn1672-0172.2022.05.011

自然对流下重力对简单冷表面微观动态结霜特性影响的实验研究

雷尚文, 宋孟杰, 张龙, 张旋

北京理工大学机械与车辆学院能源与动力工程系北京 100081

出版日期:2022-10-01 发布日期:2022-11-01
通讯作者: 宋孟杰,男,博士,教授。主要研究方向：制冷与低温。地址：北京理工大学机械与车辆学院能源与动力工程系。Email: mengjie.song@bit.edu.cn。
作者简介:雷尚文,男,硕士研究生。主要研究方向：制冷与低温。地址：北京理工大学机械与车辆学院能源与动力工程系。Email: shangwen.lei@bit.edu.cn。
基金资助:
国家自然科学基金（No. 52076013）; 北京市科学技术委员会（No. 3212024）; 中国空气动力研究与发展中心结冰与防/除冰重点实验室（No. IADL20200104）

An experimental study of gravity effect on the micro and dynamic frost characteristics on simple cold plate surfaces under natural convection

LEI Shangwen, SONG Mengjie, ZHANG Long, ZHANG Xuan

Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology Beijing 100081

Online:2022-10-01 Published:2022-11-01

摘要/Abstract

摘要： 结霜现象广泛存在于自然界和工业领域,往往造成负面影响。为准确预测和分析重力对结霜过程的影响,在自然对流条件下设计了温度为-25℃和-15℃水平、竖置和倒置冷板表面微尺度结霜实验。结果显示：液滴冷凝和汇聚、冻结液滴尖端生长和霜层生长阶段约在220秒内结束,且霜厚小于450×10-6 m。重力方向与霜枝晶生长方向一致时,重力将促进霜层生长,但也会导致大尺寸液滴形成和霜枝晶掉落。-15℃倒置冷板上,在液滴冷凝和汇聚阶段形成的液滴最大直径达到361.56×10-6 m。在霜层完全生长阶段,枝晶的周期性倒融和掉落导致霜厚的激增和激减,以及霜层表面粗糙度的波动。-25℃倒置冷板上,霜层表面粗糙度曲线的峰谷差达到了68.68×10-6 m。本研究成果可为预测换热器表面具体结霜特性提供参考。

关键词: 结霜阶段, 自然对流, 重力影响, 霜层厚度, 表面粗糙度, 倒融

Abstract: Frosting is widely seen in nature and industry fields, and always plays negative effect. To accurate predict and analyze the gravity effect on the frosting process, frosting experiments at micro scale on horizontal, vertical and inverted cold plates under natural convection are carried out, with the surface temperature set at -25℃ and -15℃. The results show the droplet condensation and coalescence, the solidified liquid tip-growth and the frost layer growth stages end within 220 s with the frost thickness less than 450×10-6 m. When the gravity direction is consistent with the direction of dendrites growth, the gravity effect promotes the dendrites growth, but also causes the formation of large droplets and falling of dendrites. At the surface temperature of -15℃, the maximum diameter of droplets of the inverted cold plate formed in the droplet condensation and coalescence stage reaches 361.56×10-6 m. The periodic reverse melting and sudden falling of dendrites in the frost layer full growth stage lead to the sudden decrease and increase of frost thickness and fluctuation of the frost layer surface roughness. The difference between the peak and the trough of the roughness curve of the inverted cold plate at the surface temperature of -25℃ reaches 68.68×10-6 m. Contributions of this study could be used for predicting the specific frost characteristics on the surface of heat exchangers.

Key words: Frosting stage, Natural convection, Gravity effect, Frost thickness, Surface roughness, Reverse melting

中图分类号:

雷尚文, 宋孟杰, 张龙, 张旋. 自然对流下重力对简单冷表面微观动态结霜特性影响的实验研究[J]. 家电科技, 2022, 0(5): 71-75.

LEI Shangwen, SONG Mengjie, ZHANG Long, ZHANG Xuan. An experimental study of gravity effect on the micro and dynamic frost characteristics on simple cold plate surfaces under natural convection[J]. Journal of Appliance Science & Technology, 2022, 0(5): 71-75.

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自然对流下重力对简单冷表面微观动态结霜特性影响的实验研究

An experimental study of gravity effect on the micro and dynamic frost characteristics on simple cold plate surfaces under natural convection

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