A Numerical Investigation of the Thermal-Hydraulics of the Helium-Cooled Modular Divertor with Multiple Jets

TL;DRAbstract

Three-dimensional numerical simulations of a test section modeling a single module of the helium-cooled modular divertor with multiple jets (HEMJ) design were performed to complement experimental studies at nearly prototypical conditions as part of the joint US-Japan effort on plasma-facing components evaluation by tritium plasma, heat, and neutron irradiation experiments (PHENIX). The Spalart-Allmaras turbulence model gave numerical predictions of the cooled surface temperature that were in good agreement with experimental estimates from a new helium loop. The simulations showed that spatial variations in incident heat flux, at least in the form of a Gaussian function, had a negligible effect on cooled surface temperatures.Our initial results indicate that the numerical predictions of the thermal performance of a single HEMJ module are in reasonable agreement with the experimental studies. The simulations do, however, predict slightly higher heat transfer coefficients (HTCs) than the

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