| 氨的添加引发水蒸气凝结换热强化的实验研究 |
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| 引用本文： | 董彬,赵军,王世学,葛明慧,赵玉龙.氨的添加引发水蒸气凝结换热强化的实验研究[J].低温与超导,2013,41(1):37-40. |
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| 作者姓名： | 董彬 赵军 王世学 葛明慧 赵玉龙 |
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| 作者单位： | 1. 天津大学机械学院中低温热能高效利用教育部重点实验室,天津300072;河南科技大学车辆与动力工程学院,洛阳471003
2. 天津大学机械学院中低温热能高效利用教育部重点实验室,天津,300072 |
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| 基金项目： | 国家重点基础研究发展计划("973") |
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| 摘 要： | 研究了添加极少量氨时,氨-水混合蒸气在水平圆管上的凝结传热特性。结果表明:由于氨的添加引发的Marangoni效应,水蒸气的凝结换热在实验工况范围内基本上都得到了强化。随着表面过冷度的增加,凝结换热系数表现出有峰值点的非线性变化规律。当氨蒸气的浓度为0.38%时,混合蒸气的最大凝结换热系数可达纯水蒸气的1.9倍,从液膜热阻和扩散热阻的角度分析了强化换热的机理。
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| 关 键 词： | Marangoni凝结 氨-水混合蒸气 相变换热 |
Experimental study of steam condensation heat transfer enhancement by addition of ammonia |
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| Dong Bin
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Zhao Jun
,
Wang Shixue
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Ge Minghui
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Zhao Yulong.Experimental study of steam condensation heat transfer enhancement by addition of ammonia[J].Cryogenics and Superconductivity,2013,41(1):37-40. |
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| Authors: | Dong Bin Zhao Jun Wang Shixue Ge Minghui Zhao Yulong |
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| Institution: | 1(1.Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,MOE,School of Mechanical Engineering, Tianjin University,Tianjin 300072,China; 2.School of Vehicle and Power Engineering,Henan University of Science and Technology,Luoyang 471003,China) |
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| Abstract: | In this paper,the condensation heat transfer characteristic of ammonia-water mixture on a horizontal smooth tube was investigated.The results showed that the condensation heat transfer enhancement was realized by addition of ammonia to water almost in all the experimental surface subcoolings.With the change of the surface subcooling,the condensation heat transfer coefficients revealed nonlinear characteristics with peak values.The maximum ratio of heat transfer coefficient compared to the pure steam is 1.9 at the ammonia vapor concentration of 0.38%.Furthermore,the mechanism of the condensation heat transfer enhancement was discussed. |
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| Keywords: | Marangoni condensation Ammonia-water vapor mixtures Phase change heat transfer |
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