Towards the accurate prediction of the turbulent flow and heat transfer in low-Prandtl fluids

Shams, A.; Santis, Andrea De

doi:10.1016/j.ijheatmasstransfer.2018.10.096

Cited by 30 publications

(11 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It shows encouraging results for the AHFM-NRG model for turbulent heat transport coupled to an isotropic linear model for momentum. The same authors explain in [22] that they have extended their turbulent heat flux model to the use of an anisotropic non-linear model for momentum. They tested it for different scenarios like the flow between two flat plates, impinging jet case from the project and for a bare rod bundle case for which reference data was available from other projects and open literature.…”

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

“…They tested it for different scenarios like the flow between two flat plates, impinging jet case from the project and for a bare rod bundle case for which reference data was available from other projects and open literature. In [23], an assessment of a variety of promising models is made with respect to the impinging jet case also used in [22]. Apart from the Reynolds analogy, three different advanced models have been employed: an implicit and explicit AHFM model and the so-called Kays correlation.…”

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

“…Limitations of the Reynolds analogy are clearly demonstrated while, all advanced models show reasonable behaviour for this forced convection case. However, they are all based on an isotropic linear model for momentum, and it is concluded that expansion to an anisotropic non-linear model (as in [22]) could clearly bring added value.…”

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

See 2 more Smart Citations

SESAME project: advancements in liquid metal thermal hydraulics experiments and simulations

Tarantino

Roelofs

Shams

et al. 2020

EPJ Nuclear Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Liquid metal cooled reactors are envisaged to play an important role in the future of nuclear energy production because of their possibility to use natural resources efficiently and to reduce the volume and lifetime of nuclear waste. Sodium and Liquid lead (-alloys) are considered the short and long term solution respectively, as coolant in GEN-IV reactor. Thermal-hydraulics of liquid metals plays a key role in the design and safety assessments of these reactors. Therefore, this is the main topic of a large European collaborative program (the Horizon 2020 SESAME) sponsored by the European Commission. This paper will present the progress in the project with respect to liquid metal cooled reactor thermal-hydraulics (liquid metal heat transfer, fuel assembly thermal-hydraulics, pool thermal-hydraulics, and system thermal-hydraulics). New reference data, both experimental and high-fidelity numerical data is being generated. And finally, when considering the system scale, the purpose is to validate and improve system thermal-hydraulics models and codes, but also to further develop and validate multi-scale approaches under development.

show abstract

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

Section: Liquid Metal Heat Transfermentioning

confidence: 99%

See 1 more Smart Citation

SESAME project: advancements in liquid metal thermal hydraulics experiments and simulations

Tarantino

Roelofs

Shams

et al. 2020

EPJ Nuclear Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The particularity of flow and heat transfer for low-Pr fluids has been widely concerned [18][19][20]. However, most studies on this issue have mainly focused on liquid metals (Pr % 0.01), where many heat transfer correlations for liquid metals were proposed [21][22][23]. Lyon et al [24] first derived a semi-empirical heat transfer correlation for a boundary condition with constant heat flux.…”

Section: Introductionmentioning

confidence: 99%

Nusselt number correlation for turbulent heat transfer of helium–xenon gas mixtures

Zhou

Sun

et al. 2021

NUCL SCI TECH

View full text Add to dashboard Cite

A gas-cooled nuclear reactor combined with a Brayton cycle shows promise as a technology for high-power space nuclear power systems. Generally, a helium–xenon gas mixture with a molecular weight of 14.5–40.0 g/mol is adopted as the working fluid to reduce the mass and volume of the turbomachinery. The Prandtl number for helium–xenon mixtures with this recommended mixing ratio may be as low as 0.2. As the convective heat transfer is closely related to the Prandtl number, different heat transfer correlations are often needed for fluids with various Prandtl numbers. Previous studies have established heat transfer correlations for fluids with medium–high Prandtl numbers (such as air and water) and extremely low-Prandtl fluids (such as liquid metals); however, these correlations cannot be directly recommended for such helium–xenon mixtures without verification. This study initially assessed the applicability of existing Nusselt number correlations, finding that the selected correlations are unsuitable for helium–xenon mixtures. To establish a more general heat transfer correlation, a theoretical derivation was conducted using the turbulent boundary layer theory. Numerical simulations of turbulent heat transfer for helium–xenon mixtures were carried out using Ansys Fluent. Based on simulated results, the parameters in the derived heat transfer correlation are determined. It is found that calculations using the new correlation were in good agreement with the experimental data, verifying its applicability to the turbulent heat transfer for helium–xenon mixtures. The effect of variable gas properties on turbulent heat transfer was also analyzed, and a modified heat transfer correlation with the temperature ratio was established. Based on the working conditions adopted in this study, the numerical error of the property-variable heat transfer correlation was almost within 10%.

show abstract

“…Duponcheel et al [15] also conducted LES to investigate the convective heat transfer for liquid metals with different Prandtl numbers and evaluated the rationality of the current RANS model. Additionally, Shams et al [16] carried out related numerical investigation on the turbulent heat transfer for the liquid lead and sodium. However, the above-mentioned researches mainly serve liquid metals, and other low-Pr fluids like gas mixtures were rarely involved.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Turbulent Flow and Heat Transfer of Helium-Xenon Gas Mixture in a Circular Tube

Zhou

Han

Sun

et al. 2021

Science and Technology of Nuclear Installations

View full text Add to dashboard Cite

Gas-cooled space nuclear reactor system usually utilizes the helium-xenon gas mixture as the working fluid. Since the typical helium-xenon mixture has the Prandtl number of about 0.2, which is lower than that of water and air, the turbulent flow and heat transfer features need to be further investigated among the helium-xenon mixture and other fluids. In the current paper, numerical investigations by ANSYS Fluent are performed on helium-xenon mixture flow (HeXe40, M = 40.0 g/mol, Pr = 0.21), airflow (Pr = 0.71), and water flow (Pr = 6.99) in the circular tube. Direct numerical simulation results of liquid metal flow (Pr = 0.01) are also adopted for comparison. Results show that the dimensionless velocity profile and shear stress in the boundary layer of HeXe40 are close to those of other fluids. The empirical correlations from other fluids can also predict well the friction factor of helium-xenon mixtures. Due to the discrepancy in turbulent heat diffusivity ratio, the dimensionless radial temperature profile and turbulent heat conduction of HeXe40 significantly differ from those of other fluids. The molecular conduction region of HeXe40 develops up to y+ ≈ 30 and extends to the logarithmic region of the flow boundary layer. Moreover, the available experimental Nusselt numbers of helium-xenon mixtures are compared with several convective heat transfer correlations, in which Kays correlation is better.

show abstract

Towards the accurate prediction of the turbulent flow and heat transfer in low-Prandtl fluids

Cited by 30 publications

References 23 publications

SESAME project: advancements in liquid metal thermal hydraulics experiments and simulations

SESAME project: advancements in liquid metal thermal hydraulics experiments and simulations

Nusselt number correlation for turbulent heat transfer of helium–xenon gas mixtures

Numerical Investigation on Turbulent Flow and Heat Transfer of Helium-Xenon Gas Mixture in a Circular Tube

Contact Info

Product

Resources

About