Influence of thermal performance on design parameters of a He/LiPb dual coolant DEMO concept blanket design

Valls, E. Mas de les; Batet, L.; Medina, Vicente; Fradera, J.; Sanmarti, M.; Sedano, L.

doi:10.1016/j.fusengdes.2012.02.074

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…Besides computations in [5][6][7], there is a significant number of theoretical studies that address various aspects of MHD flowsin the presence of FCIs, includingeffectiveness of the FCI as electrical and thermal insulator [8][9][10][11],2-D and 3-D MHD effects [12][13][14],andinfluence of pressure equalization openings in the FCI on the MHD flow [15]. Tritium transport was considered in [16,17], while studies in Ref.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of first experiments on PbLi MHD flows in a rectangular duct with foam-based SiC flow channel insert

Smolentsev

Courtessole

Abdou

et al. 2016

Fusion Engineering and Design

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A flow channel insert (FCI) is the key element of the DCLL blanket concept. The FCI serves as electrical and thermal insulator to reduce the MHD pressure dropand to decouple the temperature-limitedferritic structure from the flowing hot lead-lithium(PbLi) alloy.The main focus of the paperis on numerical computationsto simulateMHD flows in the first experiments on PbLi flows in a stainless steel rectangular duct with a foam-based silicon carbide (SiC)FCI. A single uninterrupted long-term (~6500 hrs) test has recently been performed on a CVD coated FCI sample in the flowing PbLi in a magnetic field up to 1.5 T at the PbLi temperature of 300°C in the MaPLE loop at UCLA. An unexpectedly high MHD pressure drop measured in this experiment suggests that a PbLi ingress into the FCI occurred in the course of the experiment, resulting in degradation of electroinsulating FCI properties. The ingress through the protective CVD layer was further confirmed by the post-experimental microscopic analysis of the FCI. The numerical modeling included 2D and 3D computations using HIMAG, COMSOL and a UCLA research code to address important flow features associated with the FCI finite length, fringing magnetic field, rounded FCI corners and also to predict changes in the MHD pressure drop in the unwanted event of a PbLi ingress.Two physical/mathematical models have been proposed and 3D and 2D computations performed to explain theexperimental results. Although the computations do confirm that the SiC FCI can significantly reduce the MHD pressure drop, these first testing resultsthat yet don't match the theoretical predictions, suggestthat more work on the FCI development and testing is still needed, first of all to ensure that the FCI can withstand PbLi ingress in a long run.

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Section: Introductionmentioning

confidence: 99%

Numerical modeling of first experiments on PbLi MHD flows in a rectangular duct with foam-based SiC flow channel insert

Smolentsev

Courtessole

Abdou

et al. 2016

Fusion Engineering and Design

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“…This fact has been exploited in the past to derive quasi-two dimensional (Q2D) model equations following the ideas proposed by Sommeria and Moreau (1982) [1]. Q2D models enable an efficient solution of 3D MHD problems, e.g., for shear flow instabilities [2] [3], DNS simulations of Q2D turbulent flows [4], including heat transfer and buoyant flows [5,6,7], interpretation of experimental data [8,9], or simulations for fusion blanket applications [10]. It has been shown that results for inertial isothermal flows obtained by the Q2D model can be further improved by a proper modelling of inertia terms, which leads to "barrel" or "cigar" shape flow patterns aligned along the magnetic field [11,12] instead of pure 2D structures.…”

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Validity of quasi-2D models for magneto-convection

Bühler¹,

Mistrangelo²,

Molokov³

2015

MHD

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For applications in nuclear fusion reactors where magnetic fields are very strong, liquid metal flows in the cores of ducts can often be regarded as inertialess and practically inviscid, while viscous effects are localized in thin boundary layers. The intense electromagnetic Lorentz forces, resulting from the interaction of induced electric currents and imposed magnetic field, tend to remove flow variations along magnetic field lines and they force the fluid to circulate mainly in planes perpendicular to the field. The established quasi-two dimensional magnetohydrodynamic flow can be predicted by means of an approximate model by reducing the basic governing equations to a 2D problem by analytical integration along magnetic field lines. Such models have been applied in the past by numerous authors to investigate duct flow problems and magneto-convection. However, limitations of those Q2D approaches have never been systematically studied.

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Modelling of a supercritical CO2 power cycle for nuclear fusion reactors using RELAP5–3D

Batet

Alvarez-Fernandez

Valls

et al. 2014

Fusion Engineering and Design

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Influence of thermal performance on design parameters of a He/LiPb dual coolant DEMO concept blanket design

Cited by 9 publications

References 14 publications

Numerical modeling of first experiments on PbLi MHD flows in a rectangular duct with foam-based SiC flow channel insert

Numerical modeling of first experiments on PbLi MHD flows in a rectangular duct with foam-based SiC flow channel insert

Validity of quasi-2D models for magneto-convection

Modelling of a supercritical CO2 power cycle for nuclear fusion reactors using RELAP5–3D

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