Influence of helium cooling channels on magnetohydrodynamic flows in the HCLL blanket

Mistrangelo, C.; Bühler, L.

doi:10.1016/j.fusengdes.2009.01.055

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…Turbulent two-dimensional convection provides an effective mechanism of mixing and transport resulting in a reasonably uniform heat transfer into cooled walls. Unlike the currently pursued blanket designs (Smolentsev et al 2008;Mistrangelo & Bühler 2009), the effect of convection is not detrimental, but is, in fact, exploited as a beneficial mechanism of the blanket's operation.…”

Section: Discussionmentioning

confidence: 99%

“…Should similar effects appear in an actual blanket, they would result in strong and possibly unsteady thermal stresses in the walls causing rapid deterioration of wall material and even loss of the structural integrity of the blanket. In this sense, the convection effect is highly undesirable and may even invalidate the currently pursued blanket designs, such as dual coolant lead lithium (DCLL; Smolentsev, Moreau & Abdou 2008) or helium cooled lead lithium (HCLL; Mistrangelo & Bühler 2009).…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional turbulent convection in a toroidal duct of a liquid metal blanket of a fusion reactor

Zhang

Zikanov

2015

J. Fluid Mech.

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Convection in a horizontal duct aligned with a uniform magnetic field is analysed computationally. The motivation of the study is the concept of a liquid metal blanket for a tokamak fusion reactor, in which ducts are oriented toroidally, i.e. parallel to the main component of the magnetic field. Computations of two-dimensional (streamwiseuniform) flows appearing at very strong magnetic fields and of three-dimensional flows in long domains are conducted. Non-uniform volumetric internal heating is applied, while the walls are maintained at a constant temperature. Two-dimensional or nearly two-dimensional turbulent convection is found at high Grashof and Hartmann numbers typical for fusion reactor conditions. The turbulence results in stronger mixing and more uniform distribution of wall heat flux, indicating promising potential of this concept of the blanket.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-dimensional turbulent convection in a toroidal duct of a liquid metal blanket of a fusion reactor

Zhang

Zikanov

2015

J. Fluid Mech.

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“…elements that satisfy both inf-sup conditions (22) such that the bilinear forms associated to the primal variable are coercive in the kernel of the finite element subspaces for Stokes' and Darcy's problem (see [2] for a detailed discussion). So, our stabilized formulation is appealing, in the sense that it allows equal interpolation for the different unknowns (simplifying data-base structures, coupling terms implementation and reducing CPU cost) and the use of effective solvers for high Ha numbers.…”

Section: Comparison Between Monolithic Solvers and Uncoupling Schemesmentioning

confidence: 99%

“…Fig. 9(a) shows the geometry considered as computational domain, see [21,22] for details. It consists of a U-shaped channel which measures 360 mm in its longitudinal direction (x-axis).…”

Section: Hcll Test Blanketmentioning

confidence: 99%

Approximation of the inductionless MHD problem using a stabilized finite element method

Planas

Badia

Codina

2011

Journal of Computational Physics

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“…At present there are several methods which are proposed to reduce the high MHD pressure drop, one of them is using the coupling MHD duct flows and the flow direction in the neighbouring ducts is made opposite [1], is this method effective? Moreover, the liquid metal normally flows through the electrical coupling ducts rather than a single duct in the liquid metal blanket [1,2,3], so it is necessary to investigate this issue and find out how much the MHD pressure drop and the velocity distribution affected by the strong external magnetic field in the electrical coupling ducts flows. Molokov et al has investigated the fully developed MHD flows through the straight coupling rectangular ducts [4] and the MHD flows through the electrically coupled U-bends ducts [1].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of coupling MHD rectangular ducts flows

Zhang

Chen

2013

2013 IEEE 25th Symposium on Fusion Engineering (SOFE)

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Liquid metal magnetohydrodynamic (MHD) flows through the electrical coupling rectangular ducts are investigated based on a fully developed modeling. Numerical simulations of four different coupling MHD duct flows are carried out to get the results of the MHD pressure drop and the velocity distribution. The first and second cases are that the coupling rectangular ducts are arranged along the direction of external magnetic field, the flow direction in the two ducts is the same in case 1 but it is opposite in case 2; in the third and fourth cases another coupling duct is extended along the perpendicular direction of the external magnetic field, the flow direction is identical in case 3 but it is opposite in case 4. Numerical results of the velocity and the induced electrical current distributions in the cross sections of the coupling ducts are given in those four different cases, it is indicated that the external magnetic field has a different effect on the flow pattern in those four cases. The MHD pressure drop in those four different cases are compared with the result of one normal rectangular duct flow, the MHD pressure drop of case 1 is reduced compare to the result of one normal duct MHD flows and result of case 4 is almost the same as one normal duct but the results of case 2 and 3 are larger than it, especially in case 2 it is several times larger than the result of one normal duct flow, in addition, the MHD pressure gradient decreases with the increase of the wall conductance ratio. These results are very important and should be considered in the future liquid blanket design.

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Influence of helium cooling channels on magnetohydrodynamic flows in the HCLL blanket

Cited by 20 publications

References 10 publications

Two-dimensional turbulent convection in a toroidal duct of a liquid metal blanket of a fusion reactor

Two-dimensional turbulent convection in a toroidal duct of a liquid metal blanket of a fusion reactor

Approximation of the inductionless MHD problem using a stabilized finite element method

Numerical analysis of coupling MHD rectangular ducts flows

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