TY - GEN
T1 - High Fidelity Simulation of the Light-to-dense Stratification Transient in the HiRJET Facility
AU - Tai, Cheng Kai
AU - Yuan, Haomin
AU - Merzari, Elia
AU - Bolotnov, Igor A.
N1 - Publisher Copyright:
© 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.
PY - 2023
Y1 - 2023
N2 - Density stratification in a large enclosure is a crucial phenomenon to the heat transfer and the sustainable passive heat removal of a sodium fast reactor during reactivity transients. However, the engineering models are shown to have unsatisfactory performance in predicting the propagation of the stratified front. To support the model development, this work conducted direct numerical simulation using NekRS to study the long stratification transient in the HiRJET experimental facility, which is composed of a box with jets attached to the walls. We consider the transient where the light fluid is injected to the tank containing a denser fluids. Regions with 95% density of the tank fluid and locations with the largest density gradient along the direction of gravity are marked as the mixing zone and the stratified front. Upon the injection, the jet of light fluid bent upward and impinges the top wall of the enclosure. In the early stage of the transient, the stratified front is highly turbulent and blended in the mixing zone. After the initial accumulation, the mixing front shrunk and deviated from the gradually smoothed stratified front towards the leading edge of mixing. Discussions on the potential discrepancies and the assessment of the code's ability to capture long transient are also provided.
AB - Density stratification in a large enclosure is a crucial phenomenon to the heat transfer and the sustainable passive heat removal of a sodium fast reactor during reactivity transients. However, the engineering models are shown to have unsatisfactory performance in predicting the propagation of the stratified front. To support the model development, this work conducted direct numerical simulation using NekRS to study the long stratification transient in the HiRJET experimental facility, which is composed of a box with jets attached to the walls. We consider the transient where the light fluid is injected to the tank containing a denser fluids. Regions with 95% density of the tank fluid and locations with the largest density gradient along the direction of gravity are marked as the mixing zone and the stratified front. Upon the injection, the jet of light fluid bent upward and impinges the top wall of the enclosure. In the early stage of the transient, the stratified front is highly turbulent and blended in the mixing zone. After the initial accumulation, the mixing front shrunk and deviated from the gradually smoothed stratified front towards the leading edge of mixing. Discussions on the potential discrepancies and the assessment of the code's ability to capture long transient are also provided.
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U2 - 10.13182/NURETH20-40392
DO - 10.13182/NURETH20-40392
M3 - Conference contribution
AN - SCOPUS:85193848805
T3 - Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
SP - 1233
EP - 1246
BT - Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
PB - American Nuclear Society
T2 - 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
Y2 - 20 August 2023 through 25 August 2023
ER -