六边形排列的7棒束通道内液态钠流动换热特性试验研究

以液态钠作为试验工质，对六边形排列的7棒束通道内液态钠流动换热特性进行了试验研究。试验流速为0~4 m·s^-1，热流密度为0~120 kW·m^-2，系统压力为1.5~200 kPa，对应的雷诺数和佩克莱数分别为4 000~60 000和0~340。深入分析了部分热工参数对7棒束通道内液态钠流动换热特性的影响，通过对7棒束通道内液态钠流动换热的试验数据的非线性拟合，得到适用于7棒束通道内液态钠流动换热的经验关系式。结果表明：拟合得到的摩擦系数关系式和努塞尔数关系式能准确地预测7棒束通道内的试验数据，其预测误差分别小于5%和6%。将获得的努塞尔数关系式与其他研究者的试验数据进行比较，与其他研究者985%的试验数据误差在30%以内，表明获得的关系式适用于7棒束通道内液态钠流动换热。

Experimental Study of Liquid Sodium Flow and Heat Transfer Characteristics Along Hexagonal 7-rod Bundle Channel

The flow and heat transfer characteristics of single-phase liquid sodium were experimentally investigated in a hexagonal 7-rod bundle channel with the velocity of 0-4 m/s, the heat flux of 0-120 kW/m² and the absolute pressure of 1.5-200 kPa. The corresponding Reynolds number ranges from 4 000 to 60 000, and the Peclet number varies from 0 to 340. The influence of some thermal parameters on the heat transfer characteristics of liquid sodium flow in a hexagonal 7-rod bundle channel was analyzed in depth. Empirical correlations of liquid sodium flow and heat transfer in a hexagonal 7-rod bundle channel were obtained by nonlinear regression analysis for experimental data. The results show that these correlations can accurately predict the friction coefficient and Nu in a hexagonal 7-rod bundle channel. The prediction error for flow and heat transfer is less than 5% and 6%, respectively. The new equation was compared with other results, and the error is within 30%. It is shown that the new empirical correlation is suitable for the flow heat transfer of liquid sodium in a hexagonal 7-rod bundle channel.