Thermo-hydraulic analysis of EU DEMO WCLL breeding blanket

Martelli, Emanuela; Caruso, Gianfranco; Giannetti, Fabio; Nevo, Alessandro Del

doi:10.1016/j.fusengdes.2018.03.030

Cited by 17 publications

(23 citation statements)

References 10 publications

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“…is the radial coordinate, as described by Martelli et al [5]. The magnetic field is uniform, constant, and aligned with the toroidal direction, such that B = Bŷ with B = 4.4 T.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Previous thermo-hydraulic studies have suggested that the FW cooling system passively refrigerate the nearby BZ region removing among 5%÷10% of the total power deposited with a mean heat flux q FW = -130 kW/m 2 [5]. This phenomenon is represented in the CFD model assuming a constant heat flux removed from the FW.…”

Section: Bz Cooling System Optimizationmentioning

confidence: 99%

“…Due to this strategy, the intense temperature gradient fostered by the neutronic power deposition generates buoyancy forces that add to the main forced convection flow, thus generating in the BZ a MHD mixed convection regime. Previous thermal-hydraulic studies have reported that buoyancy forces are fundamental in shaping the temperature distribution in the WCLL [5]. The rationale for this study is to evaluate the BZ cooling system performances when the magnetic field is applied and the role played by magneto-convection.…”

Section: Introductionmentioning

confidence: 99%

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MHD mixed convection flow in the WCLL: Heat transfer analysis and cooling system optimization

Tassone

Caruso

Giannetti

et al. 2019

Fusion Engineering and Design

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In the Water-Cooled Lithium Lead (WCLL) blanket, a critical problem faced by the design is to ensure that the breeding zone (BZ) is properly cooled to avoid the loss of mechanical properties in the structural materials. CFD simulations are performed using ANSYS CFX to assess the cooling system performances accounting for the magnetic field effect in the sub-channel closest to the first wall (FW). Here, intense buoyancy forces (Gr ≈ 10 10) interact with the pressure-driven flow (Re ≈ 10 3) in a MHD mixed convection regime. A constant magnetic field, parallel to the toroidal direction, is assumed with Ha = 8550. The walls bounding the channel and the water pipes are modeled as perfectly conducting. The magnetic field is found to dampen the velocity fluctuations triggered by the buoyancy forces and the flow is similar to a forced convection regime. The PbLi heat transfer coefficient is reduced to one-third of its ordinary hydrodynamic value and, consequently, hot-spots close to the FW are observed, where T Max ≈ 1000 K. Optimization strategies for the BZ cooling system layout are proposed and implemented in the CFD model, thus fulfilling the design criterion.

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“…is the radial coordinate, as described by Martelli et al [5]. The magnetic field is uniform, constant, and aligned with the toroidal direction, such that B = Bŷ with B = 4.4 T.…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Bz Cooling System Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MHD mixed convection flow in the WCLL: Heat transfer analysis and cooling system optimization

Tassone

Caruso

Giannetti

et al. 2019

Fusion Engineering and Design

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“…This solution allows to minimize the velocity and electromagnetic drag but, in turn, introduces the necessity to provide an adequate surface for the heat transfer with the coolant. For water-cooled blanket, where the coolant is pressurized at 15.5 MPa, the most widespread strategy foresees pipes immersed in the LM [9][10].…”

Section: Introductionmentioning

confidence: 99%

“…a) Fusion reactor blanket outboard module[10] and test case mesh (left), b) toroidal poloidal (z-y) cross-section and c) radial poloidal (x-y) cross-section…”

mentioning

confidence: 99%

Three-dimensional MHD flow and heat transfer in a channel with internal obstacle

Tassone¹,

Gramiccia²,

Caruso³

2018

IJHT

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The magnetohydrodynamic flow and heat transfer of a liquid metal in a channel past a circular cylinder with walls of non-uniform conductivity were investigated. The applied magnetic field was transversal to the forced flow (x-direction) and coplanar with the obstacle, featuring non-null components in both the z-and ydirections. Moreover, the cylinder was displaced by the duct centreline toward the bottom wall and its surface was at uniform temperature, so that a ΔT was present between the obstacle and the fluid at the inlet. Non-uniform thickness for the ductbounding walls is considered which leads to the promotion of jets close to the lessconductive surfaces. The flow features and heat transfer for this case were numerically investigated for different values of the Reynolds number (20 ≤ Re ≤ 80) and Hartmann number (0 ≤ Ha ≤ 100). Their effects on the flow features, pressure drop and heat transfer are analysed and discussed in detail in the present paper. The additional pressure drop introduced by the cylinder presence is found to be independent by Re and decreasing with Ha. Enhanced heat transfer is observed for an increasing Ha with Nu MHD /Nu = 1.25. at Ha = 100 due to the augmented mass flow rate in the bottom sub-channel.

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A research and development review of water-cooled breeding blanket for fusion reactors

Ling

Wang

2020

Annals of Nuclear Energy

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Thermo-hydraulic analysis of EU DEMO WCLL breeding blanket

Cited by 17 publications

References 10 publications

MHD mixed convection flow in the WCLL: Heat transfer analysis and cooling system optimization

MHD mixed convection flow in the WCLL: Heat transfer analysis and cooling system optimization

Three-dimensional MHD flow and heat transfer in a channel with internal obstacle

A research and development review of water-cooled breeding blanket for fusion reactors

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