In the present study, turbulent forced and mixed convection heat transfer to a liquid metal flowing upwards in a concentric annulus is numerically investigated by means of large eddy simulation (LES). The inner-to-outer radius ratio is 0.5. The Reynolds number based on bulk velocity and hydraulic diameter is 8900, while the Prandtl number is set to a value of 0.026. A uniform and equal heat flux is applied on both walls. LES has been chosen to provide sufficiently accurate results for validating Reynolds-averaged turbulence models. Moreover, with the thermal sublayer thickness of liquid metals being much larger than the viscous hydrodynamic one, liquid metals present a separation between the turbulent thermal and hydrodynamic scales. Thus, with the same grid resolution, it is possible to perform a LES for the flow field and a “thermal” direct numerical simulation (DNS) for the temperature field. Comparison of the forced convection results with available DNS simulations shows satisfying agreement. Results for mixed convection are analyzed and the differences with respect to forced convection at the same Reynolds number are thoroughly discussed. Moreover, where possible, a comparison with air is made.
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Research-Article
Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus
Francesco Garita
Francesco Garita
Department of Energy,
Politecnico di Milano,
Milan 20156, Italy
Politecnico di Milano,
Milan 20156, Italy
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Luca Marocco
Francesco Garita
Department of Energy,
Politecnico di Milano,
Milan 20156, Italy
Politecnico di Milano,
Milan 20156, Italy
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 6, 2017; final manuscript received September 8, 2017; published online April 6, 2018. Editor: Portonovo S. Ayyaswamy.
J. Heat Transfer. Jul 2018, 140(7): 072504 (10 pages)
Published Online: April 6, 2018
Article history
Received:
June 6, 2017
Revised:
September 8, 2017
Citation
Marocco, L., and Garita, F. (April 6, 2018). "Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus." ASME. J. Heat Transfer. July 2018; 140(7): 072504. https://doi.org/10.1115/1.4038858
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