摘要
采用均匀全周电加热方法,对内径为12 mm的垂直上升管内水在超临界压力区中的传热特性进行了实验研究.分析了质量流速、热流密度以及压力对传热特性的影响,发现由于超临界压力下边界层内流体物性的剧烈变化,使拟临界温度附近的传热得到显著强化,传热强化的程度随质量流速的增加而提高,随壁面热流密度和压力的增大而降低.根据实验数据,给出了超临界压力下水在垂直加热管内对流换热的经验关联式,其平均相对误差为11 8%.
Heat transfer characteristics of supercritical water in a vertical upflow tube with full-circumferential heating are investigated experimentally. The effects of mass flow, heat flux, and pressure on the heat transfer are analyzed via the experimental data in detail. Because of the abrupt variation of the thermophysical properties under supercritical pressure, heat transfer enhancement phenomenon is observed when the fluid bulk temperature approaches the pseudo-critical temperature. With increasing of mass flow and pressure, and with decreasing of heat flux, heat transfer is enhanced obviously. By curve-fitting of the experimental data, an empirical correlation for forced convection heat transfer of supercritical water is obtained with average relative error of 11.8%.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2005年第5期468-471,共4页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究规划资助项目(G1999022308
2003CB214500)
关键词
超临界压力
拟临界温度
经验关联式
Electric generators
Heat transfer
Heating
Mathematical models
Regression analysis
Water
