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Title: Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition

Journal Article · · Experiments in Fluids

This work experimentally investigated the flow characteristics in a facility with randomly packed spheres at a low-aspect ratio of 4.4. Velocity fields in the near-wall region and in the pores between spheres were obtained by employing the matched-index-of-refraction (MIR) and time-resolved particle image velocimetry (TR-PIV) techniques for Reynolds numbers of 340, 520, and 720. From the obtained TR-PIV velocity vector fields, flow characteristics including first- and second-order statistics, such as mean velocity, root-mean-square fluctuating velocity, and Reynolds stress profiles, were computed. The effects of the wall enclosure and Reynolds numbers on the flow patterns were investigated by comparing the computed flow statistics and evaluating two-point cross correlations of the velocities measured adjacent to and far from the wall. Comparisons of the mean velocities, root-mean-square fluctuating velocities, and Reynolds stress component showed an increase in flow mixing and turbulent intensity in the gaps between spheres in the packed bed. The re-circulation-region sizes, however, were found to be independent from an increase in Reynolds numbers. Finally, flow modal decompositions, such as the proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD), were applied to the vorticity fields extracted from sub-regions located near and far from the wall to reveal the most dominant POD and DMD flow structures.

Research Organization:
Texas A&M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
NE0008550
OSTI ID:
1571444
Journal Information:
Experiments in Fluids, Vol. 59, Issue 8; ISSN 0723-4864
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

References (68)

Flow visualization in a pebble bed reactor experiment using PIV and refractive index matching techniques journal November 2008
Application of the dynamic mode decomposition to experimental data journal February 2011
PIV measurements of turbulent flows in a 61-pin wire-wrapped hexagonal fuel bundle journal June 2017
Measurements of Transitional and Turbulent Flow in a Randomly Packed Bed of Spheres with Particle Image Velocimetry journal November 2016
Dynamic mode decomposition of numerical and experimental data journal July 2010
Statistical mechanics with three-dimensional particle tracking velocimetry experiments in the study of anomalous dispersion. II. Experiments journal January 2001
Evaluation of the performance of high-speed PIV compared to standard PIV in a turbulent jet journal May 2009
Efficient detection of spurious vectors in particle image velocimetry data journal February 1994
Measurement of two-dimensional velocity fields in porous media by particle image displacement velocimetry journal January 1992
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
Experimental studies of model porous media fluid dynamics journal October 1989
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
Direct Numerical Simulation of the Flow Through a Structured Pebble Bed Near a Wall Boundary conference November 2015
CFD modelling and experimental validation of pressure drop and flow profile in a novel structured catalytic reactor packing journal February 2001
A Macroscopic Turbulence Model for Flow in a Porous Medium journal June 1999
Optical measurements of porosity and fluid motion in packed beds journal January 1986
Digital particle image velocimetry (DPIV) robust phase correlation journal April 2009
Measurement and analysis of the turbulent length scales in jet flows journal September 2010
Pressure Drop and Fluid Flow Characteristics in a Packed Pebble Bed Reactor journal March 2017
Direct Numerical Simulation of Pebble Bed Flows: Database Development and Investigation of Low-Frequency Temporal Instabilities journal February 2017
Flow characterization using PIV measurements in a low aspect ratio randomly packed porous bed journal March 2013
A general two-equation macroscopic turbulence model for incompressible flow in porous media journal September 1997
PIV uncertainty propagation journal June 2016
Rational Krylov sequence methods for eigenvalue computation journal April 1984
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
Large eddy simulation in pebble bed gas cooled core reactors journal March 2008
Turbulent flow characteristics in a randomly packed porous bed based on particle image velocimetry measurements journal April 2013
A comparison of measured and modeled velocity fields for a laminar flow in a porous medium journal November 2015
Quasi-direct numerical simulation of a pebble bed configuration. Part I: Flow (velocity) field analysis journal October 2013
Optical measurement uncertainties due to refractive index mismatch for flow in porous media journal September 2012
Axial and radial dispersion in fixed beds journal January 1987
Quasi-direct numerical simulation of a pebble bed configuration, Part-II: Temperature field analysis journal October 2013
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
Effective heat transfer parameters for transient packed-bed models journal May 1986
A modified form of the κ–ε model for turbulent flows of an incompressible fluid in porous media journal August 2000
Uncertainty on PIV mean and fluctuating velocity due to bias and random errors journal February 2013
Implications of the selection of a particular modal decomposition technique for the analysis of shallow flows journal March 2018
A systems CFD model of a packed bed high temperature gas-cooled nuclear reactor journal January 2006
Interaction between the Flow in Two Nearby Pores within a Porous Material during Transitional and Turbulent Flow journal April 2015
Flow structures around a high-speed train extracted using Proper Orthogonal Decomposition and Dynamic Mode Decomposition journal March 2012
Measurement of porous medium velocity fields and their volumetric averaging characteristics using particle tracking velocimetry journal July 1995
Stereoscopic PIV measurements of near-wall flow in a tightly packed rod bundle with wire spacers journal April 2018
Analysis of two-point velocity measurements in near-wall flows journal December 1995
The identification of coherent structures using proper orthogonal decomposition and dynamic mode decomposition journal August 2014
Laser Doppler anemometry measurements in an index of refraction matched column in the presence of dispersed beads journal September 2000
Turbulent correlation measurements in a two-stream mixing layer. journal August 1973
A comparative experimental evaluation of uncertainty estimation methods for two-component PIV journal August 2016
Direct measurement of interstitial velocity field variations in a porous medium using fluorescent-particle image velocimetry journal January 1993
Refractive index and solubility control of para-cymene solutions for index-matched fluid–structure interaction studies journal November 2015
An investigation of matched index of refraction technique and its application in optical measurements of fluid flow journal November 2012
Characteristics of Porescale Vortical Structures in Random and Arranged Packed Beds of Spheres
  • Finn, Justin R.; Apte, Sourabh V.; Wood, Brian D.
  • ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 2: Fora https://doi.org/10.1115/FEDSM2012-72354
conference July 2013
Turbulence model for flow through porous media journal September 1996
The Proper Orthogonal Decomposition in the Analysis of Turbulent Flows journal January 1993
Spectral analysis of nonlinear flows journal November 2009
Variants of Dynamic Mode Decomposition: Boundary Condition, Koopman, and Fourier Analyses journal April 2012
Recent Mathematical Models for Turbulent Flow in Saturated Rigid Porous Media journal August 2001
Measurement of fluid velocity inside porous media with a laser anemometer journal January 1975
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
Assessment of advanced windowing techniques for digital particle image velocimetry (DPIV) journal June 2009
Phase correlation processing for DPIV measurements journal March 2008
Analysis of PIV measurements using modal decomposition techniques, POD and DMD, to study flow structures and their dynamics within a stirred-tank reactor journal March 2018
Axisymmetric wall jet development in confined jet impingement journal February 2017
Using modal decompositions to explain the sudden expansion of the mixing layer in the wake of a groyne in a shallow flow journal September 2017
Spectral Properties of Dynamical Systems, Model Reduction and Decompositions journal August 2005

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