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

Y. Q. Yu, E. Merzari, J. W. Thomas, A. Obabko, S. M. Aithal

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 the average temperature and velocity components at the measurement locations.

Original languageEnglish (US)
Pages (from-to)429-437
Number of pages9
JournalNuclear Engineering and Design
Volume312
DOIs
StatePublished - Feb 1 2017

Fingerprint

thermal phenomena
temperature
thermal fatigue
Temperature
Thermal fatigue
fatigue
Fluids
fluid
fluids
calculation
Hot Temperature
Fast reactors
crack initiation
Fatigue damage
crack propagation
nuclear energy
liquid metals
Liquid metals
Crack initiation
Nuclear energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

Cite this

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. In: Nuclear Engineering and Design. 2017 ; Vol. 312. pp. 429-437.
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Steady and unsteady calculations on thermal striping phenomena in triple-parallel jet. / Yu, Y. Q.; Merzari, E.; Thomas, J. W.; Obabko, A.; Aithal, S. M.

In: Nuclear Engineering and Design, Vol. 312, 01.02.2017, p. 429-437.

Research output: Contribution to journalArticle

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