| 表面自由能差对乙醇-水混合蒸气冷凝传热特征的影响 |
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| 引用本文： | 兰忠,马学虎,李晓楠,汪明哲.表面自由能差对乙醇-水混合蒸气冷凝传热特征的影响[J].高校化学工程学报,2009,23(3). |
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| 作者姓名： | 兰忠 马学虎 李晓楠 汪明哲 |
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| 作者单位： | 大连理工大学化学工程研究所,辽宁,大连,116012 |
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| 基金项目： | 国家自然科学基金，教育部新世纪优秀人才支持计划 |
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| 摘 要： | 实验研究了常压下不同浓度的乙醇-水混合蒸气的冷凝传热过程.发现在不同的乙醇含量和过冷度条件下,冷凝形态呈现膜状、过渡态和滴状的变化.相应传热系数也发生变化.基于该冷凝过程实质为薄液膜表面上的冷凝过程,以及蒸气冷凝传热系数随表面自由能差渐进变化的机理,首先确定了其表面自由能差为液-液表面自由能差,并以此解释了乙醇-水混合蒸气冷凝过程传热特性的变化规律.研究表明,随着冷凝液与薄液膜二者的表面自由能差的增大,冷凝传热系数逐渐增大,并且冷凝形态发生变化,当表面自由能差小于(14±1)mJ·m-2时为膜状冷凝,大于(21±1)mJ·m-2时为滴状冷凝,介于二者之间时为过渡状态.
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| 关 键 词： | 乙醇-水混台蒸气 冷凝传热 表面自由能差 界面效应 |
The Effect of Surface Free Energy Difference on Ethanol-Steam Mixture Condensation |
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| LAN Zhong,MA Xue-hu,LI Xiao-nan,WANG Ming-zhe.The Effect of Surface Free Energy Difference on Ethanol-Steam Mixture Condensation[J].Journal of Chemical Engineering of Chinese Universities,2009,23(3). |
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| Authors: | LAN Zhong MA Xue-hu LI Xiao-nan WANG Ming-zhe |
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| Affiliation: | Institute of Chemical Engineering;Dalian University of Technology;Dalian 116012;China |
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| Abstract: | The condensation heat transfer processes of ethanol-steam mixtures with different compositions were studied experimentally at atmospheric pressure. The results indicate that the values of heat transfer coefficients and the condensation modes, i.e., filmwise condensation (FWC), transition state condensation and dropwise condensation (DWC), change with the variation of mixture compositions and the degree of surface subcolling. Our previous studies showed that there is an ultra thin film of liquid mixture on t... |
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| Keywords: | ethanol-steam mixture condensation heat transfer surface free energy difference interface effect |
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