Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition
Abstract
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 dominantmore »
- Authors:
-
- 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:
- 1571444
- Grant/Contract Number:
- NE0008550
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Experiments in Fluids
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 8; Journal ID: ISSN 0723-4864
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; particle image velocimetry; two-point cross correlations; packed spheres; proper orthogonal decomposition; dynamic mode decomposition
Citation Formats
Nguyen, Thien, Kappes, Ethan, King, Stephen, Hassan, Yassin, and Ugaz, Victor. Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition. United States: N. p., 2018.
Web. doi:10.1007/s00348-018-2583-3.
Nguyen, Thien, Kappes, Ethan, King, Stephen, Hassan, Yassin, & Ugaz, Victor. Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition. United States. https://doi.org/10.1007/s00348-018-2583-3
Nguyen, Thien, Kappes, Ethan, King, Stephen, Hassan, Yassin, and Ugaz, Victor. Mon .
"Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition". United States. https://doi.org/10.1007/s00348-018-2583-3. https://www.osti.gov/servlets/purl/1571444.
@article{osti_1571444,
title = {Time-resolved PIV measurements in a low-aspect ratio facility of randomly packed spheres and flow analysis using modal decomposition},
author = {Nguyen, Thien and Kappes, Ethan and King, Stephen and Hassan, Yassin and Ugaz, Victor},
abstractNote = {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.},
doi = {10.1007/s00348-018-2583-3},
journal = {Experiments in Fluids},
number = 8,
volume = 59,
place = {United States},
year = {Mon Jul 16 00:00:00 EDT 2018},
month = {Mon Jul 16 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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