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• W4224885862 endingPage "103474" @default.
• W4224885862 startingPage "103474" @default.
• W4224885862 abstract "Thermal–hydraulic analyses of forced-flow cooled superconducting conductors designed for fusion magnets are typically based on 1-D mathematical models, which demand reliable predictive correlations for the transverse mass-, momentum- and energy transport processes occurring between different conductor components. Friction factor correlations, derived from pressure drop tests or Computational Fluid Dynamics (CFD) simulations of conductor samples, describe momentum transfer. High Temperature Superconductors (HTS) are promising materials to be applied in future fusion magnets, since they offer operating magnets at higher magnetic fields or higher temperatures as compared to the current conductors made of Low Temperature Superconductors (LTS). Various concepts of HTS cables for fusion applications are being developed, characterized and analysed. Recently three concepts of triplet HTS subsize-conductors for a quench experiment have been proposed by KIT. Each of them consists of three twisted CrossConductor (CroCo) strands enclosed in a stainless steel jacket, but they feature different copper stabilizer geometry. In the Option 1 and 2 conductors CroCo strands are contained in copper sheaths of different thickness, whereas in the Option 3 they are embedded in copper profiles with larger contact area. Hydraulic characteristics of such conductors were unknown. Three dedicated short dummy conductors with the geometry identical to Option 1–3 conductors were prepared by KIT to be tested for pressure drop. Option 1 and 2 samples were prepared and characterized earlier. In the present study we report the results of the hydraulic test of the Option 3 conductor, performed using demineralized water at different temperatures, as well as the outcomes of the CFD simulations using the ANSYS FLUENT commercial code. It was observed that the experimental values of friction factor in the turbulent regime are small (close to the respective values predicted by the smooth tube correlation). The friction factors obtained by the CFD simulations agreed with the experimental data within the range of measurement uncertainty. Based on experimental and simulation results we developed a friction factor correlation valid in a very wide range of Reynolds number which could be used in thermal-hydraulic analyses of similar HTS cables." @default.
• W4224885862 created "2022-04-27" @default.
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• W4224885862 date "2022-06-01" @default.
• W4224885862 modified "2023-10-17" @default.
• W4224885862 title "Friction factor of a forced-flow cooled HTS subsize-conductor for fusion magnets" @default.
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• W4224885862 doi "https://doi.org/10.1016/j.cryogenics.2022.103474" @default.
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