Magnetohydrodynamic flows entering the region of a flow channel insert in a duct

Kim, Chang Nyung

doi:10.1016/j.fusengdes.2013.11.013

Cited by 15 publications

(2 citation statements)

References 25 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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“…Another reason is the discontinuities in the FCI due to junctions between two FCI segments and pressure equalization openings in the FCI through which the electric currents can leak into the conducting structural wall. Experimental and theoretical studies of the flows with FCIs [150][151][152][153] predict moderate increase of the MHD pressure drop if the FCIs are not continuous. For example, experimental study [153] suggests that a thin gap between two FCI segments in a circular pipe with the radius R could be responsible for an extra 3D MHD pressure drop equivalent to a fully developed flow with the FCI with the length of 24R.…”

Section: Flow Channel Insertsmentioning

confidence: 99%

Physical Background, Computations and Practical Issues of the Magnetohydrodynamic Pressure Drop in a Fusion Liquid Metal Blanket

Smolentsev

2021

Fluids

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In blankets of a fusion power reactor, liquid metal (LM) breeders, such as pure lithium or lead-lithium alloy, circulate in complex shape blanket conduits for power conversion and tritium breeding in the presence of a strong plasma-confining magnetic field. The interaction of the magnetic field with induced electric currents in the breeder results in various magnetohydrodynamic (MHD) effects on the flow. Of them, high MHD pressure losses in the LM breeder flows is one of the most important feasibility issues. To design new feasible LM breeding blankets or to improve the existing blanket concepts and designs, one needs to identify and characterize sources of high MHD pressure drop, to understand the underlying physics of MHD flows and to eventually define ways of mitigating high MHD pressure drop in the entire blanket and its sub-components. This article is a comprehensive review of earlier and recent studies of MHD pressure drop in LM blankets with a special focus on: (1) physics of LM MHD flows in typical blanket configurations, (2) development and testing of computational tools for LM MHD flows, (3) practical aspects associated with pumping of a conducting liquid breeder through a strong magnetic field, and (4) approaches to mitigation of the MHD pressure drop in a LM blanket.

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Three-dimensional features of MHD flows turning in a right-angle duct

2016

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Magnetohydrodynamic flows entering the region of a flow channel insert in a duct

Cited by 15 publications

References 25 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

Physical Background, Computations and Practical Issues of the Magnetohydrodynamic Pressure Drop in a Fusion Liquid Metal Blanket

Three-dimensional features of MHD flows turning in a right-angle duct

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