High-performance and simplify study on replacing a secondary loop of FBR with a tank.

由于循环类型FBR的成本降低，同时保持相同的安全水平，我们提出AIHX （高级中间热交换器），它是一个组合的IHX/SG简化模块。长尺寸加热装置于1998年制造，被用作测试频道。液体金属Ga被用作一种中间热量转移介质。在1999年， Ga循环回路被添加到带有循环泵的装置上，以及一系列的强制循环热转移实验被性能为Pe的参数？500.一个总结被描述为下面。（1） Forced convective heat transfer characteristics of AIHX with Ga as working fluid。Heat transfer coefficient in the heating section was found to fall on a region （100 [less than or equal] Pe [less than or equal] 500） higher than Subboti'n equation （Nu=5+ 0. 025 Pe）D10. 8） and correlation function of Nu=5+ 0. 05 Pe（Pe）D10. 8 was obtained。In the cooling section， heat transfer coefficient fell on a region higher than Hoe's equation （Nu= 0. 43 + 0. 228 PeイD10. 67イD1）， and correlation of Nu= 6. 34 + 0. 256 PeイD10. 67イD1 was obtained。这些数据显示了AIHX的良好热量转移特征。（2）加热部分的局部流动运动和转移机制的温度流动和分析，通过交叉相关方法估计的局部流动速度与EMF值良好的协议。温度流动的RMS值被发现在速度变化中有一个峰值。这是一个建议，即流动是由温度梯度和流体离散混合机制产生的。（3）AIHX的可行性是一个在FBR中替换热量交换器，它使用自然、可靠的热量转移从当前数据中缩放，热量转移估计在性能中几乎与Monju相比，或略好。如果它是为了使用强制交付而设计的，AIHX的性能将比目前的设计基础更好。

For the purpose of cost reduction of loop type FBR while keeping same safety level, we proposed AIHX (Advanced Intermediate Heat eXchanger), which is a combined IHX/SG simplified module. The long size heating apparatus was fabricated in 1998 and was used as a test channel. Liquid metal Ga was used as an intermediate heat transfer medium. In 1999, Ga circulation loop was added to the apparatus with a circulation pump, and series of forced circulation heat transfer experiments were performed with a parameter of Pe?500. A summary was described below.(1) Forced convective heat transfer characteristics of AIHX with Ga as working fluid. Heat transfer coefficient in the heating section was found to fall on a region (100【less than or equal】Pe【less than or equal】500) higher than Subboti'n equation (Nu=5+0.025PeィイD10.8ィエD1) and correlation function of Nu=5+0.05PeィイD10.8ィエD1 was obtained. In the cooling section, heat transfer coefficient fell on a region higher than Hoe's equation (Nu=0.43+0.228PeィイD10.67ィエD1), and correlation of Nu=6.34+0.256PeィイD10.67ィエD1 was obtained. These data show a good heat transfer characteristic of AIHX.(2) Temperature fluctuation and an analysis of local fluid motion and transfer mechanism In the heating section, a local flow velocity estimated by the cross correlation method showed a good agreement with the EMF value. A RMS value of temperature fluctuation was found to have a peak in a velocity change. This suggests that fluctuation is generated by temperature gradient and fluid disturbance mixed mechanism.(3) Feasibility of AIHX as a replaced heat exchanger in FBRWith using a natural convective heat transfer scaled from the present data, the heat transfer has estimated to be almost the same with or slightly better than Monju in performance. If it is designed to used with forced convection, the performance of the AIHX will be better than the present design base for Monju.