The structure of turbulent flow through rod bundles

Rehme, K.

doi:10.1016/0029-5493(87)90116-6

Cited by 65 publications

(19 citation statements)

References 17 publications

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“…Rehme [7,16,191 reports the radial component of eddy viscosity, €if, in rod-wall geometries agreed well with Reichardt 's mode1 up to the point where Reichardt 's mode1 reached a maximum a t r = O&. Figure 2.…”

Section: Relative Wail Distance Rlr-hatsupporting

confidence: 59%

“…The observed increase in m k h g as y , decreases may be due to an increase in turbulence intensity in the gap observed by Rehme [16] …”

Section: Jijmentioning

confidence: 83%

“…Rehme aiso compared his turbulence intensities to L a n d s equation (referenced in [16]) applicable to a circular pipe. In general, the maximum turbulence intensities for the rodwall geometry were 80 to 120% larger t h m Lawn's for y , = 1.11.…”

Section: Turbulent Velocity Fluctuationsmentioning

confidence: 99%

“…Rehme [16] defines the axial, radial, and azimuthal components of turublent eddy d i h i v i t y as follows.…”

Section: Turbulent Eddy Diffusivity Anisotropymentioning

confidence: 99%

“…Rehme [16] performed measurements of the velocity fluctuations in a geometry consisting of a row of rods placed near a straight wall. The pitch-to-diameter ratio, -fP, was 1.148-Rehme observed the fluctuations of axial velocity, u', and velocity parallel to the rod and wall surfaces2, v'.…”

Section: Turbulent Velocity Fluctuationsmentioning

confidence: 99%

See 4 more Smart Citations

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

Rock

Lightstone

2001

Numerical Heat Transfer, Part A: Applications

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus. some thesis and dissertation copies are in typwriter face, while others may be from any type of cornputer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct prÏnt, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment c m adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages. these will be noted. Also, if unauthonzed copyright material had to be rernoved, a note will indicate the deletion.Oversize materials (e-g., maps, drawings, charts) are reproduoed by sedioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is induded in reduced form at the back of the book.Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6" x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. As a result, radial diffusion processes (such as pressure drop) were predicted accuratelbut azimuthal diffusion processes (such as turbulent interchange rnixing) were underpredicted. An isotropic eddy viscosity turbulence model, therefore, is not recommended for analysis of turbulent interchange mixing. Acknowledgement sWithout question, this Masters thesis benefited k o m the assistance of a number of people.For technical advice and support, 1 thank

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Section: Relative Wail Distance Rlr-hatsupporting

confidence: 59%

“…The observed increase in m k h g as y , decreases may be due to an increase in turbulence intensity in the gap observed by Rehme [16] …”

Section: Jijmentioning

confidence: 83%

Section: Turbulent Velocity Fluctuationsmentioning

confidence: 99%

“…Rehme [16] defines the axial, radial, and azimuthal components of turublent eddy d i h i v i t y as follows.…”

Section: Turbulent Eddy Diffusivity Anisotropymentioning

confidence: 99%

Section: Turbulent Velocity Fluctuationsmentioning

confidence: 99%

See 3 more Smart Citations

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

Rock

Lightstone

2001

Numerical Heat Transfer, Part A: Applications

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URANS simulation of the turbulent flow in tight lattice bundle

Yang

2011

Front. Energy

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The flow structure in tight lattice is still of great interest to nuclear industry. An accurate prediction of flow parameter in subchannels of tight lattice is likable. Unsteady Reynolds averaged Navier Stokes (URANS) is a promising approach to achieve this goal. The implementation of URANS approach will be validated by comparing computational results with the experimental data of Krauss. In this paper, the turbulent flow with different Reynolds number (5000-215000) and different pitch-to-diameter(P/D) (1.005-1.2) are simulated with computational fluid dynamics (CFD) code CFX12. The effects of the Reynolds number and the bundle geometry (P/D) on wall shear stress, turbulent kinetic energy, turbulent mixing and large scale coherent structure in tight lattice are analyzed in details. It is hoped that the present work will contribute to the understanding of these important flow phenomena and facilitate the prediction and design of rod bundles.

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The structure of turbulence in rod bundles and the implications on natural mixing between the subchannels

Rehme

1992

International Journal of Heat and Mass Transfer

138

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The structure of turbulent flow through rod bundles

Cited by 65 publications

References 17 publications

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

URANS simulation of the turbulent flow in tight lattice bundle

The structure of turbulence in rod bundles and the implications on natural mixing between the subchannels

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