Effect of Tube Diameters on Marangoni Condensation Heat Transfer for Ethanol–Water Mixture Vapors
Effect of Tube Diameters on Marangoni Condensation Heat Transfer for Ethanol–Water Mixture Vapors
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DOI：
10.1080/01457632.2015.1052695
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发表时间：
2016-03
影响因子：
2.3
通讯作者：
Jinshi Wang;Junjie Yan;Xiping Chen;D. Chong;Jiping Liu
中科院分区：
文献类型：
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作者：
Jinshi Wang;Junjie Yan;Xiping Chen;D. Chong;Jiping Liu
近年来，马兰戈尼凝结引起了人们的广泛关注。本文主要研究了在乙醇-水混合蒸汽的情况下，管径对Marangoni冷凝传热的影响。我们选择了0.793 mm、1.032 mm、1.221 mm、10.0 mm、20.0 mm等管径，以及垂直板来表示这种现象。管径范围从宏观尺度到微观尺度。实验结果表明，对于纯蒸汽，传热系数随直径的减小而单调增加。对于乙醇-水混合蒸汽，液体厚度的减小效应和冷凝液的积累效应共同影响换热。对于大表面，直径减小的促进作用起主导作用，传热系数随直径减小而增大。在微表面情况下，凝析液积聚的负作用变得活跃，并起主导作用。换热系数并不总是随着直径的减小而增大，存在最大换热系数对应的临界直径。
Marangoni condensation attracts much attention in recent years. This study focused on the effect of tube diameters on Marangoni condensation heat transfer in the case of ethanol–water mixture vapors. Several tube outer diameters, including 0.793 mm, 1.032 mm, 1.221 mm, 10.0 mm, and 20.0 mm, were chosen to indicate the phenomenon, as well as the vertical plate. The ranges of the tube diameters were from macroscale to microscale. The experimental results showed that for pure steam the heat transfer coefficients monotonically increased with the decrease in diameters. For the ethanol–water mixture vapors, the reduction effect of liquid thickness and the accumulation effect of condensate liquid jointly influenced the heat transfer. In the case of macrosurfaces, the promotion effect caused by diameter decrease played a dominant role, and the heat transfer coefficients increased with decreasing the diameters. In the case of microsurfaces, the negative effect of condensate liquid accumulation became active and was the dominant role. The heat transfer coefficients did not always increase with decreasing the diameters, and a critical diameter corresponding to the largest heat transfer coefficients existed.