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- W2916834852 abstract "Abstract A tungsten divertor will be repetitively subjected to high heat fluxes when plasma disruptions or edge-localized modes occur, and the surface of the divertor will be molten and solidified repeatedly during the reactor operation. In an experiment, a tungsten specimen was irradiated by laser, and the center of the irradiated area was found to have swollen. However, the mechanism by which the heat flux caused the swollen profile was not fully understood. Ascertaining the mechanism of convection in molten tungsten is necessary to clarify the mechanism of the profile change. To evaluate the profile-modification mechanism, we simulated the melting and solidification process of tungsten, by using a constrained interpolation profile and combined unified procedure. We simulated molten tungsten as having a free surface driven by the Marangoni effect and assuming a given temperature gradient or heat flux as the local heating. We evaluated the relationships among the free surface behavior, the molten tungsten convection, and the molten-layer aspect ratio. The surface fluctuation occurred owing to the vortex generated by the molten-layer convection, and the influence of the aspect ratio was different for the two models." @default.
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- W2916834852 date "2019-03-01" @default.
- W2916834852 modified "2023-09-27" @default.
- W2916834852 title "Evaluation of Marangoni convection and free surface velocity of molten tungsten for tungsten divertor" @default.
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- W2916834852 doi "https://doi.org/10.1016/j.fusengdes.2019.01.143" @default.
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