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

Nguyen, Thien; White, Lance; Vaghetto, Rodolfo; Hassan, Yassin

doi:10.1007/s00348-019-2778-2

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 »« less

Authors:

Nguyen, Thien ^[1]; White, Lance ^[1]; Vaghetto, Rodolfo ^[1]; Hassan, Yassin ^[1]

Texas A&M Univ., College Station, TX (United States)

Publication Date:: 2019-07-23

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.

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                    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.  https://doi.org/10.1007/s00348-019-2778-2

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                    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.  https://doi.org/10.1007/s00348-019-2778-2.  https://www.osti.gov/servlets/purl/1570696.

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@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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Journal Article Childs, Mason ; Muyshondt, Robert ; Vaghetto, Rodolfo ; ... - Journal of Fluids Engineering

Abstract The thermal-hydraulic behavior of the flow in rod bundles has motivated numerous experimental and computational investigations. Previous studies have identified potential for accumulation of debris within the small subchannels of typical wire-wrapped assemblies with subsequent total or partial blockage of subchannel coolant flow. A test campaign was conducted to study the effects of localized blockages on the bundle averaged friction factor of a tightly packed wire-wrapped rod bundle. Blockages were installed within the bundle, and fluid pressure drop was measured across one wire pitch for a Reynolds number range of 500–17,200. The Darcy–Weisbach friction factor of the perturbed rodmore »« less
https://doi.org/10.1115/1.4048140
Experimental investigation of cross flow mixing in a randomly packed bed and streamwise vortex characteristics using particle image velocimetry and proper orthogonal decomposition analysis

Journal Article Nguyen, Thien ; Muyshondt, Robert ; Hassan, Yassin ; ... - Physics of Fluids

The study of flow and heat transfer through porous media or randomly packed beds is important as these configurations are widely used in many engineering applications, for example, heat energy storage, chemical catalytic reactors, and nuclear reactors. The flow mixing characteristics in a cross-flow plane of a facility with randomly packed spheres at an aspect ratio of 6.3 were experimentally investigated. The velocity fields at several regions of the cross-flow plane located in the vicinity of the wall and in the pores between spheres were obtained by applying the matched-index-of-refraction and time-resolved particle image velocimetry (TR-PIV) techniques for Reynolds numbers ranging from 700 to 1700. The TR-PIV results revealed various flow patterns in the transverse plane of the packed spheres, including swirling flow structures aligned with the axial flow direction, a strong bypass flow near the enclosure wall, and a circulation region created when the bypass flow ejected into a large spatial gap. When the Reynolds number was increased, the peaks of root-mean-square fluctuating velocities,more »« less
Cited by 10
https://doi.org/10.1063/1.5079303

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

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Time-resolved particle image velocimetry measurements of a single impinging jet in the upper plenum of a scaled facility of high temperature gas-cooled reactors journal, April 2019

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

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

Intermittent vortex structures in homogeneous isotropic turbulence journal, March 1990

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

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

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

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

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

Hydrodynamic models and correlations for bare and wire-wrapped hexagonal rod bundles — Bundle friction factors, subchannel friction factors and mixing parameters journal, April 1986

On the identification of a vortex journal, February 1995

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

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

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

Quantitative visualization of temperature field and measurement of local heat transfer coefficient over heat exchanger elements in sinusoidal oscillating flow journal, July 2017

Stereoscopic particle image velocimetry measurements of flow in a rod bundle with a spacer grid and mixing vanes at a low Reynolds number journal, October 2017

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

The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms journal, June 1967

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

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

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

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

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

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

Experimental investigation of cross flow mixing in a randomly packed bed and streamwise vortex characteristics using particle image velocimetry and proper orthogonal decomposition analysis journal, February 2019

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

Effects of Nozzle Pressure Ratio and Nozzle-to-Plate Distance to Flowfield Characteristics of an Under-Expanded Jet Impinging on a Flat Surface journal, January 2019

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

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

On the limitations of Taylor's hypothesis in constructing long structures in a turbulent boundary layer journal, October 2008

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

Time-resolved particle image velocimetry measurements of a single impinging jet in the upper plenum of a scaled facility of high temperature gas-cooled reactors
journal, April 2019

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

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

Intermittent vortex structures in homogeneous isotropic turbulence
journal, March 1990

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

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

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

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

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

Hydrodynamic models and correlations for bare and wire-wrapped hexagonal rod bundles — Bundle friction factors, subchannel friction factors and mixing parameters
journal, April 1986

On the identification of a vortex
journal, February 1995

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

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

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

Quantitative visualization of temperature field and measurement of local heat transfer coefficient over heat exchanger elements in sinusoidal oscillating flow
journal, July 2017

Stereoscopic particle image velocimetry measurements of flow in a rod bundle with a spacer grid and mixing vanes at a low Reynolds number
journal, October 2017

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

The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms
journal, June 1967

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

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

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

Convergence study and uncertainty quantification of average and statistical PIV measurements in a matched refractive index $5 \times 5$ 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

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

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

Experimental investigation of cross flow mixing in a randomly packed bed and streamwise vortex characteristics using particle image velocimetry and proper orthogonal decomposition analysis
journal, February 2019

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

Effects of Nozzle Pressure Ratio and Nozzle-to-Plate Distance to Flowfield Characteristics of an Under-Expanded Jet Impinging on a Flat Surface
journal, January 2019

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

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

On the limitations of Taylor's hypothesis in constructing long structures in a turbulent boundary layer
journal, October 2008

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