PIV measurement of the vertical cross-flow structure over tube bundles

Iwaki, Chikako; Cheong, Kar-Hooi; Monji, Hideaki; Matsui, Goichi

doi:10.1007/s00348-004-0823-1

Cited by 67 publications

(40 citation statements)

References 7 publications

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“…No indication of periodic eddy shedding downstream of posts was observed. These observations are consistent with the data and observations of Iwaki et al [2004] who measured velocity fields for crossflow in tube bundles with rectangular and triangular pitches. Periodic eddy shedding was seen for flow in their rectangular geometry but not in the triangular case.…”

Section: Experimental Needssupporting

confidence: 93%

Development Of An Experiment For Measuring Flow Phenomena Occurring In A Lower Plenum For VHTR CFD Assessment

McEligot¹,

Condie²,

Creery³

et al. 2005

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The objective of the present report is to document the design of our first experiment to measure generic flow phenomena expected to occur in the lower plenum of a typical prismatic VHTR (Very High Temperature Reactor) concept. In the process, fabrication sketches are provided for the use of CFD (computational fluid dynamics) analysts wishing to employ the data for assessment of their proposed codes. The general approach of the project is to develop new benchmark experiments for assessment in parallel with CFD and coupled CFD/systems code calculations for the same geometry. One aspect of the complex flow in a prismatic VHTR is being addressed: flow and thermal mixing in the lower plenum ("hot streaking" issue). Current prismatic VHTR concepts were examined to identify their proposed flow conditions and geometries over the range from normal operation to decay heat removal in a pressurized cooldown. Approximate analyses were applied to determine key non-dimensional parameters and their magnitudes over this operating range. The flow in the lower plenum can locally be considered to be a situation of multiple jets into a confined crossflow --with obstructions. Flow is expected to be turbulent with momentum-dominated turbulent jets entering; buoyancy influences are estimated to be negligible in normal full power operation. Experiments are needed for the combined features of the lower plenum flows. Missing from the typical jet experiments available are interactions with nearby circular posts and with vertical posts in the vicinity of vertical walls -with near stagnant surroundings at one extreme and significant crossflow at the other.Unheated MIR (Matched-Index-of-Refraction) experiments are first steps when the geometry is complicated. One does not want to use a computational technique which will not even handle constant properties properly. The purpose of the fluid dynamics experiments is to develop benchmark databases for the assessment of CFD solutions of the momentum equations, scalar mixing and turbulence models for typical VHTR plenum geometries in the limiting case of negligible buoyancy and constant fluid properties. As indicated by the scaling studies, in normal full power operation of a typical VHTR conceptual design, buoyancy influences should be negligible in the lower plenum. The MIR experiment will simulate flow features of the paths of jets as they mix in flowing through the array of posts in a lower plenum en route to the single exit duct. The conceptual design for such an experiment is described and the development of the final apparatus is presented. Fabrication sketches are provided in Appendix A for the use of CFD analysts wishing to employ the data for assessment of their proposed codes. iv v

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Section: Experimental Needssupporting

confidence: 93%

Development Of An Experiment For Measuring Flow Phenomena Occurring In A Lower Plenum For VHTR CFD Assessment

McEligot¹,

Condie²,

Creery³

et al. 2005

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“…[10][11][12][13][14][15] Even though experimental fluid dynamics (EFD) has been used to benchmark the thermofluid phenomena for various applications, experiments are increasingly expensive and do not offer the spatiotemporal resolution provided by computational studies. Over the last decade, access and advances in computing technology have enabled computational fluid dynamics (CFD) to rapidly become an engineering tool.…”

Section: (A) (Mceligot and Mccreery 4) )mentioning

confidence: 99%

Benchmark Simulation of Turbulent Flow through a Staggered Tube Bundle to Support CFD as a Reactor Design Tool. Part I: SRANS CFD Simulation

Ridluan

Tokuhiro

2008

Journal of Nuclear Science and Technology

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Time-invariant and time-variant numerical simulations of flow through a staggered tube bundle array, idealizing the lower plenum (LP) subsystem configuration of a very high temperature reactor (VHTR), were performed. In Part I, the CFD prediction of fully periodic isothermal tube-bundle flow using steady Reynolds-averaged Navier-Stokes (SRANS) equations with common turbulence models was investigated at a Reynolds number (Re) of 1:8 Â 10 4 , based on the tube diameter and inlet velocity. Three first-order turbulence models, standard k-" turbulence, renormalized group (RNG) k-", and shear stress transport (SST) k-! models, and a second-order turbulence model, Reynolds stress model (RSM), were considered. A comparison of CFD simulations and experiment results was made at five locations along (x,y) coordinates. The SRANS simulation showed that no universal model predicted the turbulent Reynolds stresses, and generally, the results were marginal to poor. This is because these models cannot accurately model the periodic, spatiotemporal nature of the complex wake flow structure.

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“…Following this, shell-side flow in shell and tube vaporizer (STV) has received considerable attention and has been investigated. IWAKI et al [3] studied vertical cross-flow in shell and tube heat exchanger. ZDRAVKOVICH [4] reviewed previous studies concerning interstitial flow extensively.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics by particle image velocimetry in liquefied natural gas vaporizer model with several baffles

Chung¹,

Sayeed-Bin-Asad

Fajar

et al. 2011

J. Cent. South Univ. Technol.

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Shell-and-tube vaporizers are the most commonly used and dominated types of vaporizers in liquefied natural gas (LNG) realm. Due to efficient performance, shell-side flow in this type of vaporizers has received considerable attention and has been investigated extensively. However, the detailed flow structure in the shell needs to be determined for reliable and effective design. Therefore, the objective of this study was to clarify the flow structure in shell by particle image velocimetry (PIV). Experiments were conducted using two types of model; 15% baffle cut having inlet and outlet positions in the direction of 90° to the cut and 30% baffle cut having inlet and outlet positions in the direction of 180° to the cut. Each test section is 169 mm in inner diameter and 344.6 mm in length. The flow features were characterized in different baffle cuts with regards to the velocity vector field and velocity distribution. The results show that the flow characteristics of 15% baffle cut type vaporizer are comparable to those of 30% baffle cut type vaporizer.

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PIV measurement of the vertical cross-flow structure over tube bundles

Cited by 67 publications

References 7 publications

Development Of An Experiment For Measuring Flow Phenomena Occurring In A Lower Plenum For VHTR CFD Assessment

Development Of An Experiment For Measuring Flow Phenomena Occurring In A Lower Plenum For VHTR CFD Assessment

Benchmark Simulation of Turbulent Flow through a Staggered Tube Bundle to Support CFD as a Reactor Design Tool. Part I: SRANS CFD Simulation

Flow characteristics by particle image velocimetry in liquefied natural gas vaporizer model with several baffles

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