This study investigated alumina nanofluid's thermo-hydraulic performance as a coolant in the subchannel geometry of a hexagonal rod-bundle reactor core using the computational fluid dynamics (CFD) tools. This study analyzed the critical thermo-hydraulic performance-the heat transfer enhancement for an permissible increased pressure drop limit while considering the variation in the volume of nanoparticles concentrations, consistent with the previous related studies. The simulation model was developed for single-phase, forced, and turbulent flow conditions with a homogeneous mixture of species. The simulation results compared with the relevant standard correlations for the inlet Reynold number range of 20,000 to 80,000. Our study exhibited that heat transfer can be improved significantly with the addition of nano-size particles. This rise in heat transfer decreased the fuel clad surface temperature, improving the reactor fuel-clad temperature safety margin. However, the pressure drop also increased considerably, which needed to be within the permissible limit. Therefore, a trade-off between the heat transfer enhancement and drawback of the increased pressure drop within the reactor design limit is recommended.

这项研究使用计算流体力学（CFD）工具研究了六方棒束式反应堆堆芯子通道几何形状中作为冷却剂的纳米纳米流体的热工液压性能。这项研究分析了关键的热工液压性能，即在允许增加的压降极限的同时提高了传热性能，同时考虑了纳米粒子浓度的变化，这与先前的相关研究一致。针对具有均匀物种混合的单相，强迫和湍流条件开发了仿真模型。仿真结果与入口雷诺数范围为20,000至80,000的相关标准相关性进行了比较。我们的研究表明，添加纳米尺寸的颗粒可以显着改善热传递。传热的上升降低了燃料包覆表面温度，提高了反应堆燃料包覆温度的安全裕度。但是，压降也显着增加，这必须在允许的范围内。因此，建议在传热增强与反应堆设计极限内压降增加的缺点之间进行权衡。