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

Nguyen, Thien; Kappes, Ethan; King, Stephen; Hassan, Yassin; Ugaz, Victor

doi:10.1007/s00348-018-2583-3

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

Journal Article · Mon Jul 16 00:00:00 EDT 2018 · Experiments in Fluids

DOI:https://doi.org/10.1007/s00348-018-2583-3· OSTI ID:1571444

Nguyen, Thien ^[1]; Kappes, Ethan ^[2]; King, Stephen ^[2]; Hassan, Yassin ^[2]; Ugaz, Victor ^[2]

Texas A&M Univ., College Station, TX (United States); Texas A&M University, Nuclear Engineering Dept
Texas A&M Univ., College Station, TX (United States)

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.

View Accepted Manuscript (DOE)

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

Alternate ID(s):: OSTI ID: 1537678
OSTI ID: 22856894

Journal Information:: Experiments in Fluids, Journal Name: Experiments in Fluids Journal Issue: 8 Vol. 59; ISSN 0723-4864

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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