Experimental investigation on heat transfer of forced convection condensation of ethanol–water vapor mixtures on a vertical mini-tube
Experimental investigation on heat transfer of forced convection condensation of ethanol–water vapor mixtures on a vertical mini-tube
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DOI：
10.1007/s00231-013-1168-1
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发表时间：
2013-05
影响因子：
2.2
通讯作者：
Xiping Chen;D. Chong;Jinshi Wang;R. Huang;Junjie Yan
中科院分区：
文献类型：
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作者：
Xiping Chen;D. Chong;Jinshi Wang;R. Huang;Junjie Yan
本文对乙醇-水蒸汽混合物在外径为1.221mm的竖直小竖管上的凝结换热特性进行了实验研究。实验是在不同的速度和压力下进行的，在很宽的范围内的乙醇蒸汽质量分数。试验结果表明，冷凝换热系数随汽面温差的变化呈现非线性特征，且有峰值。当乙醇质量分数为2%时，乙醇-水蒸汽混合物的冷凝传热系数值最大可达50 kW m-2K-1，是纯蒸汽的3-4倍。凝结换热系数随乙醇质量分数的增加而降低。蒸汽压和蒸汽速度对乙醇-水蒸汽混合物的凝结换热系数有积极的影响。
In this paper, condensation heat transfer characteristics of ethanol–water vapor mixtures on a vertical mini-vertical tube with 1.221 mm outside diameter were investigated experimentally. The experiments were performed at different velocities and pressures over a wide range of ethanol mass fractions in vapor. The test results indicated that, with respect to the change of the vapor-to-surface temperature difference, the condensation curves of the heat transfer coefficients revealed nonlinear characteristics, and had peak values. At 2 % ethanol mass fraction in vapor, the condensation heat transfer coefficient value of the ethanol–water vapor mixture was found to have a maximum heat transfer coefficient of 50 kW m−2K−1, which was 3–4 times than that of pure steam. The condensation heat transfer coefficients decreased with increased ethanol mass fraction in vapor. The vapor pressure and vapor velocity had a positive effect on the condensation heat transfer coefficients of ethanol–water vapor mixtures.