Implications concerning rod bundle crossflow mixing based on measurements of turbulent flow structure

Rowe, D.S.; Johnson, B.M.; Knudsen, James G.

doi:10.1016/0017-9310(74)90012-x

Cited by 111 publications

(17 citation statements)

References 6 publications

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“…Al. [4] suggested the existence of a lateral macro-scale from the measurements of the dominance frequency of turbulence in a square sub-channel geometry. Rehme [5] confirmed the lateral flow pulsations between the sub-channels by analyzing the space cross-correlations of the HWA measurements.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological investigations on the turbulent flow structures in a rod bundle array with mixing devices

Chang

Moon

Baek

et al. 2008

Nuclear Engineering and Design

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Section: Introductionmentioning

confidence: 99%

Phenomenological investigations on the turbulent flow structures in a rod bundle array with mixing devices

Chang

Moon

Baek

et al. 2008

Nuclear Engineering and Design

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“…Rehme [1992] has reviewed the measurements of turbulence structure in longitudinal flow through rod bundles and related approaches to treating mixing between subchannels; he concentrated on conditions for Reynolds numbers of the order of 5 x 10 4 . Rowe, Johnson and Knudsen [1974] measured axial velocity and turbulence intensity and a few data on lateral turbulence intensity in fully-developed flow through rod bundle channels at Reynolds numbers from 5 x 10 4 to 2 x 10 5 . Ouma and Tavoularis [1991] measured mean velocity, Reynolds stresses and turbulent scales in fully-developed flow through a bundle including rod-wall subchannels; the Reynolds number was about 4.8 x 10 4 .…”

Section: Related Workmentioning

confidence: 99%

Measurements of Fundamental Fluid Physics of SNF Storage Canisters

Condie¹,

Creery²,

McEligot³

2001

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SummaryWith the University of Idaho, Ohio State University and Clarksean Associates, this research program has the long-term goal to develop reliable predictive techniques for the energy, mass and momentum transfer plus chemical reactions in drying / passivation (surface oxidation) operations in the transfer and storage of spent nuclear fuel (SNF) from wet to dry storage. Such techniques are needed to assist in design of future transfer and storage systems, prediction of the performance of existing and proposed systems and safety (re)evaluation of systems as necessary at later dates.Many fuel element geometries and configurations are accommodated in the storage of spent nuclear fuel. Consequently, there is no one generic fuel element / assembly, storage basket or canister and, therefore, no single generic fuel storage configuration. One can, however, identify generic flow phenomena or processes which may be present during drying or passivation in SNF canisters. The objective of the INEEL tasks was to obtain fundamental measurements of these flow processes in appropriate parameter ranges.With the University of Idaho, an idealization of a combined drying and passivation approach has been defined in order to investigate the generic flow processes. This simulation includes flow phenomena that occur in canisters for high-enrichment and medium-enrichment fuels, where fuel element spacing in the canister is increased as compared with low enrichment fuel. Canister diameter was taken as 46 cm (18 in.) and a single basket of about 1.3 meters (4 ft.) length was considered. A long central tube ("dip tube") served as the inlet as in one earlier concept for a passivation process; while this concept apparently has not yet been selected for application, it provides an excellent example of the coupled, complex phenomena which may be present in canister flows. Suggested design flow rates for this hypothesized application indicate that the Reynolds number in the inlet tube would be expected to be between 2500 and 5000, i.e., relatively low.The local distributions of convective mass transfer characteristics (drying/passivation) are expected to depend on the freestream turbulence in the flow around stored fuel elements. The magnitudes of this turbulence depend on the turbulence distributions on the upstream side of the perforated basket support plate ("inlet plenum") and, in turn, in the impinging jet and in the inlet tube. This information can assist engineers in understanding variations of surface drying and passivation through an array and approaches to modify designs to counter non-uniformities and to improve iii distribution, as well as providing bases for assessment of computational fluid dynamics codes proposed for the purpose.A water-flow experiment with a 3/4-scale model (relative to the idealized canister) has been used for overall flow visualization and velocity measurements, with and without an array of simulated fuel elements. Observations have been made with perforated plates (representing basket support plates) having...

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“…The purpose of rod-bundle experiments reported in the literature falls into three categories: (a) to understand flow phenomena or inter-subchannel mixing in the rod bundle geometry; (b) to support the design of innovative fuel assembly or grid spacer; and (c) to provide experimental data for model development/improvement in the subchannel analysis and CFD validation. In order to understand flow phenomena in rod bundles Rowe et al (1974) measured the turbulent flow in the bare 2 × 3 rod bundle with the two-component laser Doppler velocimetry (LDV) and pointed out the implications on existence of periodic flow pulsation in the rod bundle. Rehme (1987) Greek letter density dynamic viscosity stresses.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on anisotropic turbulent flow in a 6×6 rod bundle with LDV

Xiong

et al. 2014

Nuclear Engineering and Design

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Implications concerning rod bundle crossflow mixing based on measurements of turbulent flow structure

Cited by 111 publications

References 6 publications

Phenomenological investigations on the turbulent flow structures in a rod bundle array with mixing devices

Phenomenological investigations on the turbulent flow structures in a rod bundle array with mixing devices

Measurements of Fundamental Fluid Physics of SNF Storage Canisters

Experimental investigation on anisotropic turbulent flow in a 6×6 rod bundle with LDV

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