吴凡,胡申华,高策

• 1:新疆大学电气工程学院热能动力系

摘要(Abstract)：

本文搭建了水平圆管管外凝结传热实验台,以水-酒精混合蒸气为工质,在不同蒸气压力和不同酒精浓度的条件下对水平圆管外凝结换热特性进行了研究,并实现了实验的可视化,分析了不同酒精浓度下造成凝结换热特性差异的原因.实验结果表明:凝结表面不同位置的传热系数不同,表面张力梯度大的位置凝结传热系数较大.在相同流速和浓度条件下,酒精浓度较低时凝结传热系数随蒸气压力的升高而升高,但在高酒精浓度下,凝结液表面张力梯度减小、扩散热阻的影晌增大,蒸气压力对于凝结传热系数的影响并不明显.酒精浓度对凝结传热系数的影响因不同横截面测温点有明显差异,在浓度为2%和5%时传热系数差异较大,而在其他浓度时横截面不同测点的凝结换热效果差异较小.

关键词(KeyWords)： 水-酒精混合蒸气;凝结换热;Marangoni效应

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(50966003);; 教育部科学技术研究重点项目(211197)

作者(Author): 吴凡,胡申华,高策

参考文献(References)：

• [1]Mirkovich V V,Missen R W.Non-filmwise condensation of binary vapor of miscible liquids[J].Canadian J C E,1961,39:86-87.
• [2]Ford J D,Missen R W.On the conditions for stability of falling films subject to surface tension disturbances;the condensation of binary vapor[J].Can J Chem Eng,1968,48:309-312.
• [3]Fujii T,Osa N,Koyama S.Free Convective Condensation of Binary Vapor Mixtures on a Smooth Horizontal Tube:Condensing Mode and Heat Transfer Coefficient of Condensate[C].Proc Engineering Foundation Conference on Condensation and Condenser Design St Augustine,Florida,ASME,1993:171-182.
• [4]Morrison J N A,Deans J.Augmentation of steam condensation heat transfer by addition of ammonia[J].Int J Heat Mass Transfer,1997,40(4):765-772.
• [5]Chris Philpott,Deans Joe.The enhancement of steam condensation heat transfer in a horizontal shell and tube condenser by addition of ammonia[J].Int J Heat and Mass Transfer,2004,47:3683-3693.
• [6]Hijikata K,Fukasaku Y,Nakabeppu O.Theoretical and experimental studies on the pseudo-dropwise condensation of a binary vapor mixture[J].Int J Heat Transfer,1996,118:140-147.
• [7]Utaka Y,Terachi N.Measurement of condensation characteristic curves for binary mixture of steam and ethanol vapor[J].Heat Transfer-Japanese Res,1995,24:57-67.
• [8]Utaka Y,Terachi N.Study on condensation heat transfer for steam ethanol vapor mixture(relation between condensation characteristic curve and modes of condensate)[J].Trans Jpn Soc Mech Eng(Series B),1995,61(588):3059-3065.
• [9]Utaka Y,Wang S.Characteristic Curves and the Promotion Effect of Ethanol Addition on Steam Condensation Heat Transfer[J].Int J Heat Mass Transfer,2004,47:4507-4516.
• [10]Utaka Y,Kobayashi H.Effect of Vapor Velocity on Condensation Heat Transfer for Water Ethanol Binary Vapor Mixture[C].Proceedings of 6th ASME-JSME Thermal Engineering Conference,2003.
• [11]Chen Zhihao,Utaka Yoshio.Characteristics of condensate drop movement with application of bulk surface temperature gradient in Marangoni dropwise condensation[J].Int J Heat and Mass Transfer,2011,54:5049-5059.
• [12]Murase T,Wang H S,Rose J W.Marangoni condensation of steam-ethanol mixtures on a horizontal tube[J].Int J Heat Mass Transfer,2007,50:3774-3779.
• [13]Utaka Y,Nishikawa T.Measurement of condensate film thickness for solutal Marangoni condensation applying laser extinction method[J].Enhanced Heat Transfer,2003,10(1):119-129.
• [14]Utaka Y,Kamiyama T.Condensate drop movement in Marangoni condensation by applying bulk temperature gradient on heat transfer surface[J].Heat Transfer-Asian Res,2008,37(7):387-397.
• [15]Yan Junjie,Yang Yusen,Hu Shenhua,et al.Effects of Vapor Pressure/Velocity and Concentration on Condensation Heat Transfer for Steam-Ethanol Vapor Mixture[J].Heat and Mass Transfer,2007,44(1):51-60.
• [16]Wang JinShi,Yan JunJie,Hu ShenHua,et al.Marangoni Condensation Heat Transfer of Water-ethanol Mixtures on a Vertical Surface with Temperature Gradients[J].Int J Heat and Mass Transfer,2009,52(9-10):2324-2334.
• [17]Djordjevic E,Kabelac S.Flow boiling of R134a and ammonia in a plate heat exchanger[J].Int J Heat Mass Transfer,2008,51:6235-6242.
• [18]Moffat R J.Contributions to the Theory of Single-Sample Uncertainty Analysis[J].Journal of Fluids Engineering Trans of the ASME,1982,104(2):250-260.