Analysis of fluid flow and heat transfer in a triangular array of parallel heat generating rods

Nijsing, R.; Gargantini, I.; Eifler, W.

doi:10.1016/0029-5493(66)90067-7

Cited by 22 publications

(4 citation statements)

References 9 publications

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“…The main source of the numerical error is possibly related to the implementation of the experimental relations of turbulent viscosity. While both formula (8)< 8 ) and Eq. (9)< 9 ) were derived for regular rod bundle geometry, they are directly used for geometrically "disturbed" subchannel in this work because of lack of detailed experimental data.…”

Section: Results Of Calculationmentioning

confidence: 99%

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Numerical Method for Simulation of Fluid Flow and Heat Transfer in Geometrically Disturbed Rod Bundles

Kriventsev

Ninokata

2000

Journal of Nuclear Science and Technology

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This paper describes briefly the computational algorithm that includes procedures to obtain finite-difference form of governing convection-diffusion equations, to generate an orthogonal mesh system for complex regions and to solve the finite-difference equation system, and several results of numerical simulation in comparison with experiment.The Reynolds and energy conservation equations for steady-state fully developed turbulent incompressible flows are discretized by the Efficient Finite Difference (EFD) scheme. Here secondary flow components are neglected. In the averaged energy conservation equation, anisotropic turbulent conductivity coefficients are employed based on the axial velocity distribution. An orthogonal mesh generation system has been developed that allows us to model the rod bundle geometry by assembling elementary mesh components generated for every typical sub-domain inside the flow channels. This procedure has been made efficient with a help of object-oriented programming techniques. By solving the derived equations on the boundary-fitted coordinates, good comparisons between calculation and measurement are presented in general for detailed distributions of the local shear stress, axial velocity and wall temperature in a hexagonal rod bundle in the presence of a dislocated rod. Discussion is also made on a discrepancy of the calculated wall shear stress from the experimental data near the narrowest gap position in this "geometrically disturbed" region.

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Section: Results Of Calculationmentioning

confidence: 99%

“…The coefficient of turbulent viscosity in radial direction is used from the data of Nijsing and EiflerC 8 ) as follows: (-0.407 .Jj__)] exp (-e.Jj__) , (8) The expression of Neelen< 9 l is used for turbulent viscosity in azimuthal direction:…”

Section: Coefficients Of Turbulent Viscositymentioning

confidence: 99%

Numerical Method for Simulation of Fluid Flow and Heat Transfer in Geometrically Disturbed Rod Bundles

Kriventsev

Ninokata

2000

Journal of Nuclear Science and Technology

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“…The turbulent stresses appearing in these source terms were calculated with the ASTM equations (10)- (14).…”

Section: The Solution Methodsmentioning

confidence: 99%

“…The transport equations (4), (5) and (6) for momentum and (16) and (17) for turbulence can all be cast into the following common form: Table 5.3.1 of Reference 23. The turbulent stresses appearing in these source terms were calculated with the ASTM equations (10)- (14).…”

Section: The Solution Methodsmentioning

confidence: 99%

Turbulent flow in a duct with cusped corners

Rapley

1985

Numerical Methods in Fluids

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SUMMARYAn orthogonal-cuvilinear-mesh-based finite volume calculation method has been applied to the problem of fully developed turbulent flow in the tri-cusped cornered duct formed when parallel circular rods touch in triangular array. Algebraic stress relations combined with the k--E turbulence model are used for calculation of the required stresses. A single circulation of turbulence-driven cross-plane secondary flow from the core into the duct corner has been predicted in a one-sixth symmetry region of the duct and the convective transport effects of this flow are seen to have much influence on local mean flow distributions. The turbulence field predicted by the k--E model showed significant damping in the cusped corner region where turbulent viscosities approached the laminar value. Satisfactory agreement was obtained with the limited local and overall mean flow measurements available.

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Berechnung der turbulenten Geschwindigkeitsverteilung und der Wandreibung in unendlich ausgedehnten, parallel angeströmten Stabbündeln

Eifler¹,

Nijsing²

1969

Wärme- und Stoffübertragung

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Analysis of fluid flow and heat transfer in a triangular array of parallel heat generating rods

Cited by 22 publications

References 9 publications

Numerical Method for Simulation of Fluid Flow and Heat Transfer in Geometrically Disturbed Rod Bundles

Numerical Method for Simulation of Fluid Flow and Heat Transfer in Geometrically Disturbed Rod Bundles

Turbulent flow in a duct with cusped corners

Berechnung der turbulenten Geschwindigkeitsverteilung und der Wandreibung in unendlich ausgedehnten, parallel angeströmten Stabbündeln

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