混合蒸气在圆管外凝结特性的实验研究  

Experimental Study on Condensation Characteristics of Mixed Vapor Outside Tube

作　　者：胡申华[1] 吴凡[1] 彭建军[1] 木黑提 

机构地区：[1]新疆大学电气工程学院热能动力系,新疆乌鲁木齐830047

出　　处：《工程热物理学报》2014年第3期517-520,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50966003);教育部科学技术研究重点资助项目(No.211197)

摘　　要：在搭建圆管混合蒸气凝结换热实验台的基础上,在圆管外进行了一系列不同气相浓度酒精和水混合蒸气的Marangoni凝结实验。在实验过程中进行了可视化研究并拍摄了大量的凝结图片,研究了酒精蒸气浓度对传热系数的影响及冷却水流量对壁面温度的影响.实验结果表明,传热系数随酒精浓度的提高而降低,酒精浓度为1%时传热系数达到最高值,换热系数比相同工况下纯水蒸气提高近30%.最后,对传热系数随浓度的变化做了定性分析。A series of water-ethanol vapor mixtures experiments on Marangoni condensation outside tube was performed based on an experimental apparatus of mixed vapor condensation. During experiment visualization study was carried out and many condensation pictures were recorded. The effect of vapor concentration on heat transfer coefficient, and the influence of cooling water flow on wall temperature, was both studied. The investigation showed that heat transfer coefficient decreased when increased the concentration of the alcohol, heat transfer coefficient reached the peak value for 1% concentration, it could be augmented as much as 30% as compared with pure water vapor under similar experimental condition. Qualitative analysis on heat transfer coefficient with concentration change was also made.

关 键 词：水-酒精混合蒸气 凝结换热 圆管 MARANGONI效应 

分 类 号：TK121[动力工程及工程热物理—工程热物理]