Multi-spatio-temporal scales PIV in a turbulent buoyant jet discharging in a linearly stratified environment

Clément, Simon A.; André, Matthieu A.; Bardet, Philippe M.

doi:10.1016/j.expthermflusci.2021.110429

Multi-spatio-temporal scales PIV in a turbulent buoyant jet discharging in a linearly stratified environment

Journal Article · Mon May 24 00:00:00 EDT 2021 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/j.expthermflusci.2021.110429· OSTI ID:1977121

Clément, Simon A. ^[1]; André, Matthieu A. ^[2]; Bardet, Philippe M. ^[2]

PYTHEAS Technology, Meyreuil (France); OSTI
George Washington University, Washington, DC (United States)

Time-resolved particle image velocimetry is implemented with a camera array and several laser sheets; this results in a multi-spatio-temporal scale system that is modular and flexible. The setup is optimized to capture global flow features, while locally resolving in space and time near the Kolmogorov scale. The apparatus relies extensively on machine vision CMOS cameras; they are inexpensive and stream to computer hard drive with virtually continuous time-resolved records (up to one hour for the current system). This leads to statistically converged data and also helps in minimizing down time between experimental runs. Details of the implementation and design of experiment are reported. The system instruments a vertical buoyant jet discharging in a linearly stratified environment. Refractive index matched aqueous solutions enable precise optical deployment. The density difference is 3% and the fluids have similar dynamic viscosity. The jet Reynolds number is 2.00 x 10⁴ and is above the mixing transition. Such flows are typically challenging to instrument and few velocity field data are available to date. The velocity statistics are reported as well as first insights gained from the campaign.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Oakland, CA (United States); University of Michigan, Ann Arbor, MI (United States); George Washington University, Washington, DC (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NA0003180; NE0008265

OSTI ID:: 1977121

Alternate ID(s):: OSTI ID: 1797825

Journal Information:: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: C Vol. 129; ISSN 0894-1777

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Multi-spatio-temporal scales PIV in a turbulent buoyant jet discharging in a linearly stratified environment

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