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化工学报  2013 

高温高压水在垂直下降管内的传热特性

DOI: 10.3969/j.issn.0438-1157.2013.07.011, PP. 2386-2393

Keywords: 垂直下降管,传热恶化,壁温,传热系数

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Abstract:

在压力11.5~28MPa,质量流速450~1550kg·m-2·s-1,内壁热负荷50~585kW·m-2的范围内,对水在垂直下降管内的传热特性进行了实验研究,得到了垂直下降管内水的传热特性,分析了热负荷对内壁温度和传热系数的影响,给出了能用于工程实际的传热实验关联式,并且对垂直下降流动和垂直上升流动的传热特性进行了比较。实验结果表明:在亚临界和近临界压力区,垂直下降管会发生第一类传热恶化——膜态沸腾和第二类传热恶化——干涸。热负荷的增大,会导致传热恶化的提前发生和传热恶化发生后的壁温飞升值增大。在超临界压力区,壁温在低焓值区随焓值平缓增加,而在高焓值区随焓值明显升高,表明在拟临界点附近发生了传热强化现象。

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