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Title: Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet

Abstract

The phenomenon of thermal striping is encountered in liquid metal cooled fast reactors (LMFR), in which temperature fluctuation due to convective mixing between hot and cold fluids can lead to a possibility of crack initiation and propagation in the structure due to high cycle thermal fatigue. Using sodium experiments of parallel triple jets configuration performed by Japan Atomic Energy Agency (JAEA) as benchmark, numerical simulations were carried out to evaluate the temperature fluctuation characteristics in fluid and the transfer characteristics of temperature fluctuation from fluid to structure, which is important to assess the potential thermal fatigue damage. In this study, both steady (RANS) and unsteady (URANS, LES) methods were applied to predict the temperature fluctuations of thermal striping. The parametric studies on the effects of mesh density and boundary conditions on the accuracy of the overall solutions were also conducted. The velocity, temperature and temperature fluctuation intensity distribution were compared with the experimental data. As expected, steady calculation has limited success in predicting the thermal–hydraulic characteristics of the thermal striping, highlighting the limitations of the RANS approach in unsteady heat transfer simulations. The unsteady results exhibited reasonably good agreement with experimental results for temperature fluctuation intensity, as well as themore » average temperature and velocity components at the measurement locations.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1417294
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Engineering and Design; Journal Volume: 312; Journal Issue: C
Country of Publication:
United States
Language:
English

Citation Formats

Yu, Y. Q., Merzari, E., Thomas, J. W., Obabko, A., and Aithal, S. M. Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet. United States: N. p., 2017. Web. doi:10.1016/j.nucengdes.2016.06.015.
Yu, Y. Q., Merzari, E., Thomas, J. W., Obabko, A., & Aithal, S. M. Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet. United States. doi:10.1016/j.nucengdes.2016.06.015.
Yu, Y. Q., Merzari, E., Thomas, J. W., Obabko, A., and Aithal, S. M. Wed . "Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet". United States. doi:10.1016/j.nucengdes.2016.06.015.
@article{osti_1417294,
title = {Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet},
author = {Yu, Y. Q. and Merzari, E. and Thomas, J. W. and Obabko, A. and Aithal, S. M.},
abstractNote = {The phenomenon of thermal striping is encountered in liquid metal cooled fast reactors (LMFR), in which temperature fluctuation due to convective mixing between hot and cold fluids can lead to a possibility of crack initiation and propagation in the structure due to high cycle thermal fatigue. Using sodium experiments of parallel triple jets configuration performed by Japan Atomic Energy Agency (JAEA) as benchmark, numerical simulations were carried out to evaluate the temperature fluctuation characteristics in fluid and the transfer characteristics of temperature fluctuation from fluid to structure, which is important to assess the potential thermal fatigue damage. In this study, both steady (RANS) and unsteady (URANS, LES) methods were applied to predict the temperature fluctuations of thermal striping. The parametric studies on the effects of mesh density and boundary conditions on the accuracy of the overall solutions were also conducted. The velocity, temperature and temperature fluctuation intensity distribution were compared with the experimental data. As expected, steady calculation has limited success in predicting the thermal–hydraulic characteristics of the thermal striping, highlighting the limitations of the RANS approach in unsteady heat transfer simulations. The unsteady results exhibited reasonably good agreement with experimental results for temperature fluctuation intensity, as well as the average temperature and velocity components at the measurement locations.},
doi = {10.1016/j.nucengdes.2016.06.015},
journal = {Nuclear Engineering and Design},
number = C,
volume = 312,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}