Development Project of Supercritical-water Cooled Power Reactor (Heat Transmission Simulation of Supercritical Fluid)

Abstract

The applicability of three-dimensional heat transmission simulation using a high Re number k-ε model for supercritical pressure R-22 was evaluated. The calculated heat transfer coefficient using the standard k-ε model was good in agreement with the experiment results of Kyushu University researchers below 90℃. On the other hand, the calculated heat transfer coefficient became smaller than experimental results by 20% or more in temperature range above 90℃, which temperature was near the pseudo-critical temperature where coolant properties changed rapidly. C/E using the standard k-ε model and MARS scheme was 0.99 below 90℃, 0.79 above 90℃ and 0.94 of all temperature range. It is expected that standard k-ε model can be applied in where coolant temperature was enough lower than the pseudo-critical temperature. Using the two-layer model, which can use a smaller mesh near the pseudo-critical temperature will be considered in the near future.