Abstract
Lead bismuth eutectic (LBE) is one of the most potential materials for coolant for Lead based reactor and Accelerator Driven Systems (ADS). Thermal-hydraulic behaviour of LBE in fuel assembly is a key issue for development of the systems. To get a deeper understanding on the complex thermal-hydraulic features of wire-wrapped rod bundle cooled by upward LBE, CFD calculation based on RANS methodologies were also performed to support the experimental results analysis. The results concluded that LBE has the similar flow resistance characteristics with traditional fluids. Both the Rehme correlation and CFD showed a good agreement with the experimental results. As for the entrance characteristics, during the fully heating length (exceeding 140 times the hydraulic diameter), the thermal field did not reach a fully developed and stable condition which is contrary to the ducted flows. Based on the experimental results and CFD investigation of heat transfer coefficient showed that the hexagonal shell has a great influence on the heat transfer coefficient in rod bundle geometry. For this reason, the application of empirical correlation should be kept cautious in rod bundle analysis.
Highlights
Accelerator Driven sub-critical Systems (ADS) are considered as one of the most potential options to incinerate long living fission products by transmutation [1,2]
The aim of this paper is to get a deeper understanding on the complex thermal-hydraulic features of wire-wrapped rod bundle cooled by upward LeadBismuth Eutectic (LBE)
A bundle with 7 rods with helical wire was analyzed based on threedimensional computational fluid dynamics (CFD) programs based on RANS methodology
Summary
Accelerator Driven sub-critical Systems (ADS) are considered as one of the most potential options to incinerate long living fission products by transmutation [1,2]. With respect to low melting temperature, high boiling temperature, outstanding heat transfer performance, chemical stability, and good neutron economy, LeadBismuth Eutectic (LBE) is more and more attractive word wild to be both the coolant for sub-critical reactor core and spallation target in transmutation systems [3,4]. Owing to its lower Prandtl number, the heat transfer with heavy liquid metal is very different from the heat transfer with water or gas [5]. That is, compared to the contribution from convection, the contribution from thermal conductivity in low Prandtl number fluid like lead-bismuth eutectic is much higher than water even through at the conditions with high Reynolds number. Existing heat transfer numerical models and experimental experience are not directly applicable to systems cooled with liquid metal
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