A novel approach to the study of magnetohydrodynamic effect on tritium transport in WCLL breeding blanket of DEMO

Candido, Luigi; Alberghi, Ciro; Moro, F.; Noce, Simone; Testoni, Raffaella; Utili, Marco; Zucchetti, Massimo

doi:10.1016/j.fusengdes.2021.112334

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…It uses the finite element method to simulate diffusion and trapping of hydrogen isotopes based on macroscopic rate equations [22]. The tritium source term S expressed in (m −3 s −1 ) has been taken from the literature [17]:…”

Section: Hydrogen Transportmentioning

confidence: 99%

“…Extensive work has been completed on the modelling of BBs for DEMO in the literature. Typically focussed on neutronics [14][15][16], magneto-hydrodynamics (MHD) [17,18], mechanical fields [19] and tritium transport [20,21]. However, previous work that evaluated values of tritium inventories in the structure and permeation fluxes does not account for trapping, though trapping mechanisms significantly affect inventory values within tungsten (W) [22] and EUROFER [8,23].…”

Section: Introductionmentioning

confidence: 99%

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Influence of hydrogen trapping on WCLL breeding blanket performances

et al. 2021

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Tritium transport simulations in water-cooled lithium lead (WCLL) breeding blankets have been performed with FESTIM. Fluid dynamics and heat transfer were coupled to evaluate how temperature and LiPb velocity fields affect tritium transport. The 2D WCLL model consisted of tungsten, EUROFER and liquid LiPb. Tritium inventories and permeation fluxes have been computed and the influence of trapping effects in solid domains was highlighted. It was evaluated that inclusion of trapping mechanisms increases inventory values by 15% and delays permeation to the cooling channels. A parametric study was conducted to investigate the impact of the uncertainty in the literature (2 orders of magnitude) regarding hydrogen solubility in LiPb on these quantities. Varying the lithium lead solubility over the range found in the literature was found to vary the EUROFER inventory by a factor of 25. Permeation fluxes to the coolant channels was found to vary over a factor of 3.

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Section: Hydrogen Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of hydrogen trapping on WCLL breeding blanket performances

et al. 2021

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“…Elements are generated in x and y direction with a geometric distribution, maximizing the number of cells in the side and Hartmann layers. The mesh, selected following a grid convergence study [5], consists of 50 elements in the x-direction and 75 in the y-direction for Ha = 500, 64 × 100 for Ha = 5000 and 78 × 125 for Ha = 10, 000 and 15, 000; eight cells were always ensured in the Hartmann and side layers. Although the problem is invariant in z-direction, one element is generated in the direction of the flow to consider the vector products involving the magnetic field.…”

Section: Two-dimensional Fully Developed Laminar Steady Mhd Flowmentioning

confidence: 99%

“…The presence of the external magnetic field produces an additional MHD pressure drop, and although rougher MHD studies can predict the ∆p [2], other phenomena, such as turbulence and buoyancy-driven convection, have a drastic impact on blanket performance and require a deeper analysis. In addition, tritium transport mechanisms [3][4][5] are influenced by the magnetic field; therefore, a detailed solution of magnetohydrodynamics is necessary, and it is obtainable with 3D multiphysics models for the breeding blanket. Smolentsev et al [6] proposed activity for verification and validation of MHD codes for fusion applications, consisting of a series of benchmark problems whose results are known from experimental data or trusted analytical and numerical solutions.…”

Section: Introductionmentioning

confidence: 99%

Verification and Validation of COMSOL Magnetohydrodynamic Models for Liquid Metal Breeding Blankets Technologies

et al. 2021

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Liquid metal breeding blankets are extensively studied in nuclear fusion. In the main proposed systems, the Water Cooled Lithium Lead (WCLL) and the Dual Coolant Lithium Lead (DCLL), the liquid metal flows under an intense transverse magnetic field, for which a magnetohydrodynamic (MHD) effect is produced. The result is the alteration of all the flow features and the increase in the pressure drops. Although the latter issue can be evaluated with system models, 3D MHD codes are of extreme importance both in the design phase and for safety analyses. To test the reliability of COMSOL Multiphysics for the development of MHD models, a method for verification and validation of magnetohydrodynamic codes is followed. The benchmark problems solved regard steady state, fully developed flows in rectangular ducts, non-isothermal flows, flow in a spatially varying transverse magnetic field and two different unsteady turbulent problems, quasi-two-dimensional MHD turbulent flow and 3D turbulent MHD flow entering a magnetic obstacle. The computed results show good agreement with the reference solutions for all the addressed problems, suggesting that COMSOL can be used as software to study liquid metal MHD problems under the flow regimes typical of fusion power reactors.

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Verification and validation of mHIT code over TMAP for hydrogen isotopes transport studies in fusion-relevant environments

Candido

Alberghi

2021

Fusion Engineering and Design

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A novel approach to the study of magnetohydrodynamic effect on tritium transport in WCLL breeding blanket of DEMO

Cited by 10 publications

References 28 publications

Influence of hydrogen trapping on WCLL breeding blanket performances

Influence of hydrogen trapping on WCLL breeding blanket performances

Verification and Validation of COMSOL Magnetohydrodynamic Models for Liquid Metal Breeding Blankets Technologies

Verification and validation of mHIT code over TMAP for hydrogen isotopes transport studies in fusion-relevant environments

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