Thermal-hydraulic analyses on simplified cross-flow mercury target

A cross-flow type mercury target, which controls mercury flow rate distribution in the target channel using perforated plates, is proposed to simplify the target structure for the JAERI/KEK spallation neutron source (JSNS). Computational fluid dynamics (CFD) is being used to assess feasibility of this target structure for 2 MW beam power spallation sources. The high Reynolds number form k-ε turbulence model with turbulent Prandtl number (Prt) of 1.5 is used with turbulent boundary conditions calculated by wall functions. The CFD simulations show that the proposed target structure can realize high cooling performance with allowable flow rate using simple perforated plates when its open area distribution is optimized. (author)