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Turbulent flow simulation in a wire-wrap rod bundle of an LMFBR
Published in
2010
Volume: 240
   
Issue: 5
Pages: 1063 - 1072
Abstract
The pressure drop and heat transfer characteristics of wire-wrapped 19-pin rod bundles in a nuclear reactor subassembly of liquid metal cooled fast breeder reactor (LMFBR) have been investigated through three-dimensional turbulent flow simulations. The predicted results of eddy viscosity based turbulence models (k-ε, k-ω) and the Reynolds stress model are compared with those of experimental correlations for friction factor and Nusselt number. The Re is varied between 50,000 and 150,000 and the ratio of helical pitch of wire wrap to the rod diameter is varied from 15 to 45. All the three turbulence models considered yield similar results. The friction factor increases with reduction in the wire-wrap pitch while the heat transfer coefficient remains almost unaltered. However, reduction in the wire-wrap pitch also enhances the transverse flow velocity in the cross-sectional plane as well as the local turbulence intensity, thereby improving the thermal mixing of coolant. Consequently, the presence of wire wrap reduces temperature variation within each section of the subassembly. The associated reduction in differential thermal expansion of rods is expected to improve the structural integrity of the fuel subassembly. © 2010 Elsevier B.V. All rights reserved.
About the journal
JournalNuclear Engineering and Design
ISSN00295493
Open AccessNo
Concepts (29)
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    DIFFERENTIAL THERMAL EXPANSION
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    Eddy viscosity
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    Experimental correlation
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    Friction factors
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    FUEL SUBASSEMBLY
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    Heat transfer characteristics
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    HELICAL PITCH
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    LIQUID METAL COOLED FAST BREEDER REACTORS
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    LOCAL TURBULENCE
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    REYNOLDS STRESS MODELS
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    Rod bundles
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    Temperature variation
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    THERMAL MIXING
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    THREE-DIMENSIONAL TURBULENT FLOW
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    Transverse flow
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    Fast reactors
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    Flow simulation
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    Friction
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    Heat exchangers
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    Heat transfer
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    LIQUID METAL COOLED REACTORS
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    Liquid metals
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    Nuclear propulsion
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    Reynolds number
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    Thermal expansion
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    Turbulence models
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    Turbulent flow
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    Wire
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    LIQUID METAL FAST BREEDER REACTORS