本文研究了蒸汽压力对水-酒精混合蒸汽竖直平板表面凝结换热特性的影响.搭建了具有高气密性的Marangoni凝结换热实验台,分别针对不同压力(31.16 kPa,47.36 kPa,84.53 kPa)、不同表面过冷度(表面过冷度范围2～32℃)的纯水、水-酒精混合液(气相酒精质量百分比浓度为2.28%,5.1%,51%)和酒精进行了换热特性的实验研究,实验结果表明混合蒸汽在相同流速和浓度下凝结表面传热系数随压力的升高而升高,分析认为这是因为相平衡压力的提高会导致凝结液量增加和凝结液平均温度提高,而使凝结汽液界面的表面张力提高,进一步增强了Marangoni效应的影响,从而使凝结表面传热得到加强.
参考文献
| [1] | Mirkovich V V;Missen R W .Non-Filmwise Condensation of Binary Vapors of Miscible Liquids[J].Canadian Journal of Chemical Engineering,1961,39(04):86-87. |
| [2] | Mirkovich V V;Missen R W .A Study of the Condensation of Binary Vapors of Miscible Liquids,Part 2:Heat Transfer Coefficients for Filmwise and Non-Filmwise Condensation[J].Canadian Journal of Chemical Engineering,1963,41(04):73-78. |
| [3] | Ford J D;Missen R W .On the Conditions for Stability of Falling Films Subject to Surface Tension Disturbances; the Condensation of Binary Vapors[J].Canadian Journal of Chemical Engineering,1968,48(10):309-312. |
| [4] | Scriven L E;Sternling C V .The Marangoni Effects[J].Nature,1960,187(07):186-188. |
| [5] | Fujii T;Koyama S;Shimizu Y et al.Gravity Controlled Condensation of an Ethanol and Water Mixture on a Horizontal Tube[J].Transactions of Japan Society of Mechanical Engineers Series B,1989,55(01):210-217. |
| [6] | Hijikata K;Fukasaku Y;Nakabeppu O .Theoretical and Experimental Studies on Pseudo-Dropwise Condensation of a Binary Vapor Mixture[J].Transactions of the ASME,1996,118(02):140-147. |
| [7] | Domingo N;Chen F C;Murphy R W.Ammonia Water Mixture Experiments[M].Oak Ridge National Laboratory,TN,1992 |
| [8] | Morrison JNA;Deans J .Augmentation of Steam Condensation Heat Transfer by Addition of Ammonia[J].International Journal of Heat and Mass Transfer,1997,40(04):765-772. |
| [9] | Utaka Y .Measurement of Condensation Characteristic Curves for Binary Mixture of Steam and Ethanol Vapor[J].Heat Transfer-Japanese Research,1996,24(01):57-67. |
| [10] | Yoshio Utaka;Shixue Wang .Characteristic curves and the promotion effect of ethanol addition on steam condensation heat transfer[J].International Journal of Heat and Mass Transfer,2004(21):4507-4516. |
| [11] | Morrison JNA .The Condensation of Ammonia-Water Vapours on a Horizontal Tube[D].New Zealand:The University of Auckland,1996. |
| [12] | Morrison JNA;Deans J .Augmentation of Steam Condensation Heat Transfer by Addition of Ammonia[J].International Journal of Heat and Mass Transfer,1997,40(04):765-772. |
| [13] | 何仰朋,严俊杰,杨豫森,刘继平.水和酒精Marangoni凝结换热特性研究[J].工程热物理学报,2004(01):77-80. |
| [14] | Moffat R J .Contributions to the Theory of Single-Sample Uncertainty Analysis[J].Journal of Fluids Engineering,Transactions of the ASME,1982,104(02):250-260. |
| [15] | 吴树森;章达豪.界面化学[M].上海:华东化工学院出版社,1989:30-36. |
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