原子能科学技术Issue(4)：630-636,7.DOI:10.7538/yzk.2014.48.04.0630
10 mm 垂直单管通道内超临界水传热弱化现象的实验与数值分析
Experimental and Numerical Study on Convection Heat Transfer Deterioration of Supercritical Water in 10 mm Vertical Tube
摘要
Abstract
T he heat transfer at supercritical pressure is mainly characterized by the ther-mo-physical properties w hich vary strongly near the vicinity of pseudo-critical point . The strong variation of density leads to great buoyancy effect at low flow rate ,which imposes great influence on supercritical fluid flow and heat transfer . The convection heat transfer deterioration of supercritical water in 10 mm vertical tube was studied ,and an improved low Reynolds turbulent model was proposed in numerical study to analyze the heat transfer deterioration phenomenon .T he calculation results of supercritical fluid heat transfer show that traditional turbulence models overestimate wall temperature , but the present model can predict wall temperature correctly .The numerical results also show the buoyancy effect on turbulent shear stress and flow velocity distribution ,w hich leads to heat transfer deterioration and recovery .关键词
超临界压力/传热弱化/浮升力Key words
supercritical pressure/convection heat transfer deterioration/buoyancy分类
能源科技引用本文复制引用
张戈,张昊,顾汉洋,杨燕华..10 mm 垂直单管通道内超临界水传热弱化现象的实验与数值分析[J].原子能科学技术,2014,(4):630-636,7.基金项目
973计划资助项目（2007CB209804）；国家自然科学基金资助项目 （）
