| 摘要: |
| 本文针对铝基波纹翅片换热器广泛应用及结霜问题，基于相变驱动力分析结霜机理，实验研究了在不同冷表面温度(-5~-15 ℃)、空气温度(11~17 ℃)、空气流速(1.5 ~2.5 m/s)等工况下，铝基裸铝波纹表面的结霜情况，观察了铝基波纹表面上霜层生长过程中的微观形貌，并采用田口实验法分析了环境因素对表面结霜情况的影响。结果表明：环境因素的改变会对铝基波纹表面结霜产生不同程度的影响，以波纹角度11.3°为例，结霜60 min时，与冷表面温度为-5 ℃相比，冷表面温度为-10 ℃和-15 ℃时结霜量分别增长12.20%和31.28%，霜层厚度分别增长19.95%和47.24%。田口实验法分析表明：相比湿空气温度和空气流速，冷表面温度和湿空气相对湿度对波纹表面结霜特性影响相对较大，对波纹表面结霜量的贡献率分别为37.3%和31.8%，对霜层厚度的贡献率分别为61.1%和22.6%。空气流速对结霜量的贡献率为22.6%，而对结霜层厚度的贡献率仅为4.2%，表明空气流速对霜层的致密化作用较大。 |
| 关键词: 结霜 相变驱动力 波纹表面 微观形貌 田口法 |
| DOI： |
| 投稿时间：2021-08-30 修订日期：2021-12-05
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| 基金项目:河南省自然科学基金（162300410112）、河南理工大学博士基金（B2021-37）资助。 |
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| Experimental Study on Frosting Characteristics of Wavy Aluminum Surfaces |
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Liu Yao1, Sheng Wei1,2, Fang Yongqiang1, Zhang Peicheng1, Zheng Haikun1,2, Hao Xiaoru1
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| (1.College of Mechanical and Power Engineering, Henan Polytechnic University;2.Hami Henan New Energy Industry Research Institute) |
| Abstract: |
| Aiming at extensive applications and frosting problems of wavy finned-tube heat exchangers and based on the phase change driving force to analyze its frosting mechanism, the frosting characateristics on wavy aluminum surfaces with different cold surface temperatures (-5-15 ℃), air temperatures (11-17 ℃), and air velocities (1.5-2.5 m/s) were experimentally analyzed in this study. The micromorphology of frost growth on wavy aluminum surfaces was observed. In addition, the environmental effects on frost formation were analyzed using the Taguchi experimental method. The results showed that a change in experimental conditions affected the frosting characteristics on wavy aluminum surfaces. Using a wavy plate with a wavy angle of 11.3° as an example, when the frosting time was 60 min, compared to a cold surface temperature of﹣5 ℃, the frosting weight increased by 12.20% and 31.28%, and the frost layer thickness increased by 19.95% and 47.24%, when the cold surface temperature was﹣10 ℃ and﹣15 ℃, respectively. Based on the Taguchi experimental method, when compared to the air temperature and velocity, the cold surface temperature and air relative humidity greatly influence the frosting characteristics on wavy surfaces. These analyses that were based on the Taguchi experimental method revealed that the contribution rates of cold surface temperature and air relative humidity to the frosting weight of wavy surfaces were 37.3% and 31.8%, respectively, and the contribution rates to the frost layer thickness were 61.1% and 22.6%, respectively. Compared to the air temperature and velocity, the cold surface temperature and air relative humidity had a greater impact on the frosting characteristics on wavy surfaces. It is worth noting that the contribution rate of air velocity to the frost weight was 22.6%, while the contribution rate of frost layer thickness was only 4.2%, revealing that the air velocity played a considerable role in the densification of the frost layer. |
| Key words: frost phase change driving force wavy surface micromorphology Taguchi method |
