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Title: Turbulent flow and vortex characteristics in a blocked subchannel of a helically wrapped rod bundle

Abstract

The study of flow and heat transfer through a bundle of rods is important, as this type of configuration is widely used in many engineering applications, for example, in heat exchangers, clusters of support structures, steam generators, and nuclear power reactors. This work experimentally investigated the flow-field characteristics of rod bundles with helically wrapped wires (wire-wrapped rod assemblies) proposed for advanced burner reactors. Subchannel blockage is one of the most interesting accident scenarios for liquid metal fast reactors as different mechanisms can lead to a partial or total subchannel blockage. It is of paramount important to understand the thermal-hydraulic behavior of the flow in the vicinity of such blockages. The flow mixing characteristics in two interior subchannels located near the core of the bundle, one without and one with the presence of a blockage, were experimentally investigated. The velocity fields within the spatial gaps of two subchannels were obtained by applying the matched-index-of-refraction and time-resolved particle image velocimetry (TR-PIV) technique for Reynolds numbers of 4000 and 17,000. The first- and second-order statistics, including the mean velocity, root-mean-square fluctuating velocity, and Reynolds stress, were computed from the obtained TR-PIV velocity vector fields. In the blocked sub-channel, the TR-PIV results revealed amore » large recirculation flow region in the vicinity of the blockage that was created by the interaction between inflows from neighboring subchannels. Spectral analysis was performed and the vortex shedding frequency indicated by the Strouhal number was found to be St = 0.16 for the two Reynolds numbers investigated. The flow characteristics of the interior subchannels were investigated via the two-point cross-correlation of fluctuating velocities. In addition, proper orthogonal decomposition (POD) analysis was applied to the instantaneous vorticity fields to extract the statistically dominant flow structures. Lastly, the statistical characteristics of the vortex, such as the vortex populations, spatial distributions, and vortex strengths, were acquired by combining POD analysis and the vortex identification algorithm.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Texas A&M Univ., College Station, TX (United States)
Publication Date:
Research Org.:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1570696
Grant/Contract Number:  
NE0008652
Resource Type:
Accepted Manuscript
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Volume: 60; Journal Issue: 8; Journal ID: ISSN 0723-4864
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; particle image velocimetry; wire-wrapped rod assembly; two-point cross correlations; proper orthogonal decomposition; nuclear thermal-hydraulics

Citation Formats

Nguyen, Thien, White, Lance, Vaghetto, Rodolfo, and Hassan, Yassin. Turbulent flow and vortex characteristics in a blocked subchannel of a helically wrapped rod bundle. United States: N. p., 2019. Web. doi:10.1007/s00348-019-2778-2.
Nguyen, Thien, White, Lance, Vaghetto, Rodolfo, & Hassan, Yassin. Turbulent flow and vortex characteristics in a blocked subchannel of a helically wrapped rod bundle. United States. doi:10.1007/s00348-019-2778-2.
Nguyen, Thien, White, Lance, Vaghetto, Rodolfo, and Hassan, Yassin. Tue . "Turbulent flow and vortex characteristics in a blocked subchannel of a helically wrapped rod bundle". United States. doi:10.1007/s00348-019-2778-2.
@article{osti_1570696,
title = {Turbulent flow and vortex characteristics in a blocked subchannel of a helically wrapped rod bundle},
author = {Nguyen, Thien and White, Lance and Vaghetto, Rodolfo and Hassan, Yassin},
abstractNote = {The study of flow and heat transfer through a bundle of rods is important, as this type of configuration is widely used in many engineering applications, for example, in heat exchangers, clusters of support structures, steam generators, and nuclear power reactors. This work experimentally investigated the flow-field characteristics of rod bundles with helically wrapped wires (wire-wrapped rod assemblies) proposed for advanced burner reactors. Subchannel blockage is one of the most interesting accident scenarios for liquid metal fast reactors as different mechanisms can lead to a partial or total subchannel blockage. It is of paramount important to understand the thermal-hydraulic behavior of the flow in the vicinity of such blockages. The flow mixing characteristics in two interior subchannels located near the core of the bundle, one without and one with the presence of a blockage, were experimentally investigated. The velocity fields within the spatial gaps of two subchannels were obtained by applying the matched-index-of-refraction and time-resolved particle image velocimetry (TR-PIV) technique for Reynolds numbers of 4000 and 17,000. The first- and second-order statistics, including the mean velocity, root-mean-square fluctuating velocity, and Reynolds stress, were computed from the obtained TR-PIV velocity vector fields. In the blocked sub-channel, the TR-PIV results revealed a large recirculation flow region in the vicinity of the blockage that was created by the interaction between inflows from neighboring subchannels. Spectral analysis was performed and the vortex shedding frequency indicated by the Strouhal number was found to be St = 0.16 for the two Reynolds numbers investigated. The flow characteristics of the interior subchannels were investigated via the two-point cross-correlation of fluctuating velocities. In addition, proper orthogonal decomposition (POD) analysis was applied to the instantaneous vorticity fields to extract the statistically dominant flow structures. Lastly, the statistical characteristics of the vortex, such as the vortex populations, spatial distributions, and vortex strengths, were acquired by combining POD analysis and the vortex identification algorithm.},
doi = {10.1007/s00348-019-2778-2},
journal = {Experiments in Fluids},
number = 8,
volume = 60,
place = {United States},
year = {2019},
month = {7}
}

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Works referenced in this record:

Flow visualization in a pebble bed reactor experiment using PIV and refractive index matching techniques
journal, November 2008


Phase-resolved PIV measurements of flow over three unevenly spaced cylinders and its coupling with acoustic resonance
journal, March 2019


A comparison between snapshot POD analysis of PIV velocity and vorticity data
journal, January 2005


PIV measurements of turbulent flows in a 61-pin wire-wrapped hexagonal fuel bundle
journal, June 2017


A new artificial neural network tracking technique for particle image velocimetry
journal, June 1997


Direct simulation of turbulent swept flow over a wire in a channel
journal, March 2010


An Experimental Investigation of Turbulent Convection Velocities in a Turbulent Boundary Layer
journal, December 2014

  • Atkinson, Callum; Buchmann, Nicolas Alexander; Soria, Julio
  • Flow, Turbulence and Combustion, Vol. 94, Issue 1
  • DOI: 10.1007/s10494-014-9582-0

Efficient detection of spurious vectors in particle image velocimetry data
journal, February 1994


Intermittent vortex structures in homogeneous isotropic turbulence
journal, March 1990

  • She, Zhen-Su; Jackson, Eric; Orszag, Steven A.
  • Nature, Vol. 344, Issue 6263
  • DOI: 10.1038/344226a0

Fluid flow investigations within a 37 element CANDU fuel bundle supported by magnetic resonance velocimetry and computational fluid dynamics
journal, August 2017


Combining PIV, POD and vortex identification algorithms for the study of unsteady turbulent swirling flows
journal, August 2001

  • Graftieaux, Laurent; Michard, Marc; Grosjean, Nathalie
  • Measurement Science and Technology, Vol. 12, Issue 9
  • DOI: 10.1088/0957-0233/12/9/307

Low-dimensional procedure for the characterization of human faces
journal, January 1987

  • Sirovich, L.; Kirby, M.
  • Journal of the Optical Society of America A, Vol. 4, Issue 3
  • DOI: 10.1364/JOSAA.4.000519

Optical measurements of pore geometry and fluid velocity in a bed of irregularly packed spheres
journal, March 2008

  • Huang, Alice Y. L.; Huang, Michelle Y. F.; Capart, Hervé
  • Experiments in Fluids, Vol. 45, Issue 2
  • DOI: 10.1007/s00348-008-0480-x

Collaborative framework for PIV uncertainty quantification: the experimental database
journal, June 2015

  • Neal, Douglas R.; Sciacchitano, Andrea; Smith, Barton L.
  • Measurement Science and Technology, Vol. 26, Issue 7
  • DOI: 10.1088/0957-0233/26/7/074003

Estimation of uncertainty bounds for individual particle image velocimetry measurements from cross-correlation peak ratio
journal, April 2013


Collaborative framework for PIV uncertainty quantification: comparative assessment of methods
journal, June 2015

  • Sciacchitano, Andrea; Neal, Douglas R.; Smith, Barton L.
  • Measurement Science and Technology, Vol. 26, Issue 7
  • DOI: 10.1088/0957-0233/26/7/074004

Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition
journal, July 2018


Digital particle image velocimetry (DPIV) robust phase correlation
journal, April 2009


Benchmark exercise for fluid flow simulations in a liquid metal fast reactor fuel assembly
journal, March 2016


Measurement and analysis of the turbulent length scales in jet flows
journal, September 2010


Flow and convective heat transfer analysis using RANS for a wire-wrapped fuel assembly
journal, September 2006

  • Ahmad, Imteyaz; Kim, Kwang-Yong
  • Journal of Mechanical Science and Technology, Vol. 20, Issue 9
  • DOI: 10.1007/BF02915974

Numerical simulations for determination of minimum representative bundle size in wire wrapped tube bundles
journal, October 2017


CFD analysis of flow blockage phenomena in a LBE-cooled 19-pin wire-wrapped rod bundle
journal, April 2019


Comparison of experimental and simulation results on interior subchannels of a 61-pin wire-wrapped hexagonal fuel bundle
journal, November 2018


Comparison of vortex identification criteria for planar velocity fields in wall turbulence
journal, August 2015

  • Chen, Qigang; Zhong, Qiang; Qi, Meilan
  • Physics of Fluids, Vol. 27, Issue 8
  • DOI: 10.1063/1.4927647

A method for characterizing cross-sections of vortices in turbulent flows
journal, October 2012


The upgraded Cheng and Todreas correlation for pressure drop in hexagonal wire-wrapped rod bundles
journal, August 2018


PIV measurements on the passive control of flow past a circular cylinder
journal, January 2016


PIV uncertainty propagation
journal, June 2016


Heat transfer experiment in a partially (internally) blocked 19-rod bundle with wire spacers cooled by LBE
journal, April 2018


Spatial characterization of the numerically simulated vorticity fields of a flow in a flume
journal, February 2005

  • Liberzon, Alex; Gurka, Roi; Tiselj, Iztok
  • Theoretical and Computational Fluid Dynamics, Vol. 19, Issue 2
  • DOI: 10.1007/s00162-004-0156-y

Measurements of jet flows impinging into a channel containing a rod bundle using dynamic PIV
journal, November 2009


PTV/PIV measurements of turbulent flows in interior subchannels of a 61-pin wire-wrapped hexagonal fuel bundle
journal, June 2018


Numerical simulation of turbulent flow through a 37-element CANDU fuel bundle
journal, February 2012


CFD investigation of effect of helical wire-wrap parameters on the thermal hydraulic performance of 217 fuel pin bundle
journal, March 2015


Flow velocity measurements using digital pulsed laser velocimetry
journal, January 1991


Uncertainty on PIV mean and fluctuating velocity due to bias and random errors
journal, February 2013


Stochastic estimation of a separated-flow field using wall-pressure-array measurements
journal, February 2007

  • Hudy, Laura M.; Naguib, Ahmed; Humphreys, William M.
  • Physics of Fluids, Vol. 19, Issue 2
  • DOI: 10.1063/1.2472507

A general classification of three‐dimensional flow fields
journal, May 1990

  • Chong, M. S.; Perry, A. E.; Cantwell, B. J.
  • Physics of Fluids A: Fluid Dynamics, Vol. 2, Issue 5
  • DOI: 10.1063/1.857730

Progress in on-going experimental and computational fluid dynamic investigations within a CANDU fuel channel
journal, April 2016


Direct simulation of turbulent heat transfer in swept flow over a wire in a channel
journal, October 2011


Pressure Measurements in a Wire-Wrapped 61-Pin Hexagonal Fuel Bundle
journal, October 2017

  • Vaghetto, Rodolfo; Jones, Philip; Goth, Nolan
  • Journal of Fluids Engineering, Vol. 140, Issue 3
  • DOI: 10.1115/1.4038086

Convergence study and uncertainty quantification of average and statistical PIV measurements in a matched refractive index 5 × 5 rod bundle with mixing vane spacer grid
journal, April 2019


Vertical, Bubbly, Cross-Flow Characteristics over Tube Bundles
journal, October 2005


Stereoscopic PIV measurements of near-wall flow in a tightly packed rod bundle with wire spacers
journal, April 2018


A CFD analysis of flow blockage phenomena in ALFRED LFR demo fuel assembly
journal, September 2014


Turbulent correlation measurements in a two-stream mixing layer.
journal, August 1973

  • Jones, B. G.; Planchon, H. P.; Hammersley, R. J.
  • AIAA Journal, Vol. 11, Issue 8
  • DOI: 10.2514/3.6885

Modeling of Flow Blockage in a Liquid Metal-Cooled Reactor Subassembly with a Subchannel Analysis Code
journal, January 2005

  • Jeong, Hae-Yong; Ha, Kwi-Seok; Chang, Won-Pyo
  • Nuclear Technology, Vol. 149, Issue 1
  • DOI: 10.13182/NT05-A3580

A comparative experimental evaluation of uncertainty estimation methods for two-component PIV
journal, August 2016


Experimental and numerical investigation of turbulent cross-flow in a staggered tube bundle
journal, April 2008


An investigation of matched index of refraction technique and its application in optical measurements of fluid flow
journal, November 2012


POD of vorticity fields: A method for spatial characterization of coherent structures
journal, June 2006


Mechanisms for generating coherent packets of hairpin vortices in channel flow
journal, May 1999


Direct numerical simulation of transitional flow in a staggered tube bundle
journal, February 2016

  • Linton, D.; Thornber, B.
  • Physics of Fluids, Vol. 28, Issue 2
  • DOI: 10.1063/1.4942180

The Proper Orthogonal Decomposition in the Analysis of Turbulent Flows
journal, January 1993


PIV measurement of the vertical cross-flow structure over tube bundles
journal, June 2004


Development of a high speed particle image velocimetry technique using fluorescent tracers to study steam bubble collapse
journal, September 1994


Analysis and interpretation of instantaneous turbulent velocity fields
journal, September 2000

  • Adrian, R. J.; Christensen, K. T.; Liu, Z. -C.
  • Experiments in Fluids, Vol. 29, Issue 3
  • DOI: 10.1007/s003489900087

Evaluation of existing correlations for the prediction of pressure drop in wire-wrapped hexagonal array pin bundles
journal, February 2014


Pressure/velocity coupling induced by a near wall wake
journal, January 2010


A method for automatic estimation of instantaneous local uncertainty in particle image velocimetry measurements
journal, July 2012

  • Timmins, Benjamin H.; Wilson, Brandon W.; Smith, Barton L.
  • Experiments in Fluids, Vol. 53, Issue 4
  • DOI: 10.1007/s00348-012-1341-1

Assessment of advanced windowing techniques for digital particle image velocimetry (DPIV)
journal, June 2009


Phase correlation processing for DPIV measurements
journal, March 2008


Flow boiling of distilled water over plain tube bundle with uniform and varying heat flux along the height of the tube bundle
journal, April 2017


Experimental investigations on single-phase convection and steam-water two-phase flow boiling in a vertical rod bundle
journal, January 2017


Analysis of two-point velocity measurements in near-wall flows
journal, December 1995


Coherent structures and turbulence
journal, December 1986


Vortex identification: New requirements and limitations
journal, August 2007