环形通道内液态金属钠流动传热特性数值模拟

利用数值方法,使用商用软件ANSYSCFX,针对内径4~10mm、外径7~20mm的环形通道内不同边界条件下单相钠的流动和传热特性进行了研究,分析了流速、入口温度、内壁面热流密度和外壁面热流密度等对其流动传热的影响。结果表明,环形通道间隙对液态金属钠流动和传热影响较大,热流密度对其影响较小。将计算结果与文献中理论和实验结果进行了比较和分析,得出环形通道内液态金属钠的传热关系式。数值模拟结果与文献实验结果吻合较好,总体趋势符合良好。

Numerical Simulation on Flow and Heat Transfer Characteristics of Sodium in an Annuli

Numerical simulation on the flow and heat transfer characteristics of sodium flowing in an annuli was conducted using ANSYS CFX. The inside diameter of the annuli was from 4mm to 10 mm while the outside diameter from 7mm to 20 mm. The influence of the velocity, inlet temperature, heat flux from the inner surface and outside surface were analyzed. Calculation results showed that the gap of the annuli was with great effects on the flow and heat transfer characteristics of sodium significantly, but the heat flux with little effect. Results in this work were compared with the theoretical and experimental results from literatures. A correlation of the heater transfer coefficient for liquid sodium flowing in an annuli was proposed based on the analysis. The calculation results in this work show good consistency with other theoretical and experimental results.