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

Abstract:

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 theoretical research was carried on by analyzing the flow of steam, noncondensed gas thermal resistance and solidliquid interfacial 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.

Key words: condensation heat transfer coefficient, overall heat transfer coefficient, tube bundles,  heat transfer enhancement