Experimental investigation of velocity distribution and flow resistance in a triangular array of parallel rods

Eifler, W.; Nijsing, R.

doi:10.1016/0029-5493(67)90075-1

Cited by 48 publications

(10 citation statements)

References 4 publications

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“…with the geometry parameter for Reynolds numbers Re < 10 6 the curvature of the wall (7)(8)(9)(10)(11). Results obtained on annuli by Brighton and Jones [12] showing a dependence of the velocity profile on the curvature of the wall do not agree with measurements by Quarmby [18].…”

Section: O;mentioning

confidence: 99%

Simple method of predicting friction factors of turbulent flow in non-circular channels

Rehme

1973

International Journal of Heat and Mass Transfer

115

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Abstract-On the basis of friction factor relationships of a simple model a method is developed which allows the prediction of friction factors for turbulent flow in non-circular channels if only the geometry factor of the pressure drop relationship for laminar flow is known. The proposed method of calculation is tested with numerous experimental results from the literature with respect to non-circular channels such as triangular shaped ducts, eccentric annuli and rod bundles in hexagonal and square arrays in circular tubes, hexagonal and square channels. It turns out that the proposed method provides an excellent description of all the experimental data at hand.channel wall and rods; annular zone parameter; wall distance; dimensionless wall distance y+ =

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Section: O;mentioning

confidence: 99%

Simple method of predicting friction factors of turbulent flow in non-circular channels

Rehme

1973

International Journal of Heat and Mass Transfer

115

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“…The CFD prediction shows the friction factor in between the measured value and the McAdams factor. It is well known from previous studies (Eifler and Nijsing, 1967;Marek et al, 1973;Rehme, 1973a) that the friction factor tends to decrease as the p/d ratio of the rod bundle decreases. Fig.…”

Section: Loss Coefficient Of Spacer Gridmentioning

confidence: 91%

Measurement and CFD calculation of spacer loss coefficient for a tight-lattice fuel bundle

Shin

Kwack

et al. 2015

Nuclear Engineering and Design

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“…For balanced cases the inflow Re of both sub-channels are equal, and all four Reynolds numbers listed above were studied, with this paper presenting data for lowest and highest Re. For the unbalanced flows, focus was on sub-channel A with inlet Re A = 10 5 and sub-channel B with Re B = 4, 6 and 8 x10 4 . The flow conditions in the channels upstream of the gap, but downstream of the boundary layer trip, were surveyed using two dimensional Laser Doppler Velocimetry (LDV) measurements of the axial flow velocity.…”

Section: Inflow Conditionsmentioning

confidence: 99%

“…Several researchers have experimentally studied the flows in parallel channels connected by narrow gaps [1,2,3,4,5,6,7,8]. In particular, Meyer [8] provides a review of inter-channel mixing, and discusses the underlying flow processes, including the large-scale coherent structures.…”

Section: Introductionmentioning

confidence: 99%

Single-phase mixing through a narrow gap

Mäkiharju

Yoon

Mychkovsky

et al. 2019

Experimental Thermal and Fluid Science

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Mixing through narrow gaps connecting adjacent flow paths is an important mass and heat transfer process for many thermo−hydraulic applications. Such flows are considered balanced when the inlet flow speeds of adjacent subchannels are matched. In the present work, experimental observations are presented for balanced and unbalanced flows including the mixing coefficients and flow visualization within the gap. The large coherent structures are identified, with frequency in general agreement with those reported by previous investigators. To utilize Proper Orthogonal Decomposition (POD) for the discrete data yielded by PIV, we employ method of Singular Value Decomposition (SVD). The bulk of the mixing is attributed to the dominant modes and demonstrate that mixing rates estimated from velocity measurements are in fair agreement with mixing coefficients based on tracer concentration measurements.

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Experimental investigation of velocity distribution and flow resistance in a triangular array of parallel rods

Cited by 48 publications

References 4 publications

Simple method of predicting friction factors of turbulent flow in non-circular channels

Simple method of predicting friction factors of turbulent flow in non-circular channels

Measurement and CFD calculation of spacer loss coefficient for a tight-lattice fuel bundle

Single-phase mixing through a narrow gap

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