论文部分内容阅读
针对球床过冷水(单相)流动传热特性等效模型开展实验研究,分析各热工参数对等效模型流动传热特性的影响规律,并拟合出等效模型的阻力系数和换热系数经验关系式。实验参数范围为:雷诺数467~3350,热流密度50~150 k W/m2。实验结果表明:在本实验参数范围内,压降随表观流速的增加而增大,呈二次方关系;压降随流体进口温度的增加而减小;换热系数随热流密度和表观流速的增加而增大。
Aiming at the equivalent model of the convective heat transfer of undercooled water in a ball bed, an experimental study was conducted on the effects of various thermal parameters on the heat transfer characteristics of the equivalent model. The drag coefficient and heat transfer of the equivalent model Coefficient empirical relationship. The experimental parameters range: Reynolds number 467 ~ 3350, heat flux density 50 ~ 150 k W / m2. The experimental results show that the pressure drop increases with the increase of apparent velocity in the range of experimental parameters, which shows a quadratic relationship. The pressure drop decreases with the increase of fluid inlet temperature. The heat transfer coefficient decreases with the increase of heat flux density Flow rate increases and increases.