Evaluation of heat transfer performance on drum side of orthogonal flow type Na heat exchanger. Application of inviscid vortex-free flow model to zig-zag tube arrangement system

Recently, for the purpose of heightening the economical efficiency and performance of FBRs, it has been attempted to evaluate the performance of intermediate heat exchangers and steam generators with large computation codes. If the heat transfer characteristics of individual heating tubes can be grasped with the required accuracy by numerical analysis, it is most economical and realistic. There is the possibility of being able to forecast the heat transfer coefficient using the inviscid vortex-free flow model considering only the basic features of flow fields with the practical accuracy. In this research, first, the visualization experiment on the flow orthogonally crossing the tube nest of zig-zag arrangement using water was carried out to elucidate the features. Based on the observed results, the analysis of the heat transfer coefficient of alkali metals orthogonally crossing the tube nest of zig-zag arrangement was carried out for single tube heating and whole tube heating systems, using the inviscid vortex-free flow model. The visualization experiment and the numerical analysis are reported. (K.I.)