渗层不锈钢管束表面真空下换热特性的实验分析  

Experimental analysis of condensation heat transfer characteristics under vacuum condition of Nickel based implanted tube bundle

作　　者：程屾 孙奉仲[1] 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061

出　　处：《山东大学学报（工学版）》2014年第1期90-94,共5页Journal of Shandong University（Engineering Science）

基　　金：山东省科技发展计划基金资助项目(2012GGE27012)

摘　　要：为了探究在真空条件下材料表面特性对蒸汽凝结换热的影响机理,从实验和凝结理论两个方面入手探索了在真空条件下渗层不锈钢管束壁面蒸汽凝结的换热特性。在真空条件下进行对比实验,实验结果表明,渗层不锈钢管束的凝结换热性能明显优于普通铜管束,且随着真空的提高,效果更为显著,最高提升幅度可达77%。进而从真空对蒸汽的流场、非冷凝气体的热阻及其固相和液相间的界面能差三个部分论证了真空度的提升有利于冷凝液滴的形成和凝结换热效果的提升,与实验结果相符。The steam condensation heat transfer characteristics of Nickel based implanted tube bundle was studied though comparative experiments and theoretical analysis for exploring effect mechanism on steam condensation heat transfer by surface material characteristics.The results showed that the Nickel based implanted tube bundle had a better performance than common copper tube, especially in a higher vacuum state, the maximum enhance rate was up to 77%.The theo-retical research was carried on by analyzing the flow of steam, non-condensed gas thermal resistance and solid-liquid in-terfacial energy, it turned out that dropwise condensation was easily generated under lower pressure and its heat transfer coefficient increased with a rising vacuum, consistent with the subsequent experimental results.

关 键 词：真空度 强化传热 换热管束 凝结传热系数 总体传热系数 

分 类 号：TK172[动力工程及工程热物理—热能工程]