Abstract
Abstract A burnout database in the range of channel geometries and subcooled flow boiling of water of interest for the Next European Torus (NET) diverter cooling system is presented. Data were collected in 18 electrically heated tubes, heated uniformly or on one side, with and without turbulence promoters. The influence of fluid thermal-hydraulic conditions, tube and swirl promoter geometry, and peripheral heating on burnout heat flux is analyzed and discussed. Fluid velocity, inlet subcooling, and swirl flow promoter geometry were the main parameters affecting the burnout regardless of channel geometry and peripheral heat distribution. Swirl flow promoter increased the burnoit heat flux, from 1.2 up to 2.1, compared to smooth flow depending on the promoter twist ratio. Results are compared with existing data in the literature and with the predictions of the Tong 75 correlation. The final results appear to be quite satisfactory.
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