Numerical investigation of turbulent aided mixed convection of liquid metal flow through a concentric annulus

Marocco, Luca; Valmontana, A. Alberti di; Wetzel, Th.

doi:10.1016/j.ijheatmasstransfer.2016.09.107

Cited by 27 publications

(14 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…heat transfer is enhanced for opposed turbulent mixed convection and impaired in the aided case. Nevertheless, as shown in the study of Marocco et al [7], when considering an annulus, even a fluid with a Prandtl number of 0.025 behaves differently from medium-to-high Prandtl number fluids. To the authors' best knowledge the only available studies in literature on turbulent mixed convection of a liquid metal flowing in an annulus are those of Ref.…”

Section: Introductionmentioning

confidence: 90%

“…As argued in Ref. [7], the reason could be found in the difficulties related to the experimental investigation of these fluids. To the best of the authors' knowledge the most reliable experimental data on mixed convection to liquid metals are still those of Buhr et al [8] of 1974 for mercury (Pr = 0.025) and Jackson et al [9] of 1994 for sodium (Pr = 0.005) flowing in a vertical pipe.…”

Section: Introductionmentioning

confidence: 99%

“…For an exhaustive and comprehensive description of the phenomenon the interested reader is referred to the works of Ref. [6,7] and references therein.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover they mainly deal with a flow in a uniformly heated pipe (refer to Ref. [7] and references therein). For low-Prandtl-number fluids such as liquid metals, the number of available literature works significantly drops.…”

Section: Introductionmentioning

confidence: 99%

“…To the authors' best knowledge the only available studies in literature on turbulent mixed convection of a liquid metal flowing in an annulus are those of Ref. [7] and Ref. [10], the latter for α = 0.1 and with only the inner wall heated.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus

Marocco

Garita

2018

Journal of Heat Transfer

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

“…For an exhaustive and comprehensive description of the phenomenon the interested reader is referred to the works of Ref. [6,7] and references therein.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus

Marocco

Garita

2018

Journal of Heat Transfer

View full text Add to dashboard Cite

show abstract

A brief review of liquid heat transfer materials used in concentrated solar power systems and thermal energy storage devices of concentrated solar power systems

Wang

Pang

Jiang

2022

Engineering Reports

View full text Add to dashboard Cite

Solar power generation is an effective approach to promote the achievement of carbon neutrality. Heat transfer materials (HTMs) are important for concentrated solar power (CSP) systems and their accessary thermal energy storage (TES) devices. The performances of HTMs can influence the operation behaviors of CSP systems and TES devices. On the whole, the HTMs can be divided into three categories according to their physical states, which are the liquid, gaseous, and solid HTMs, respectively. This article presents a brief review of research works on liquid HTMs used in CSP systems and TES devices of CSP systems, mainly including different kinds of molten salts, heat transfer oils, nanofluids, liquid metals, and water. Some typical practical applications, experimental and simulation studies on different kinds of liquid HTMs used in CSP and TES systems are introduced, and the advantages, disadvantages, and further research and development work prospects of different kinds of HTMs are briefly summarized. This article aims to providing a reference for researchers in solar thermal power field.

show abstract

Magnetohydrodynamic mixed convection in a non‐Newtonian third‐grade fluid flowing through vertical parallel plates: A semianalytical study of flow and heat transfer

et al. 2022

View full text Add to dashboard Cite

Buoyancy assisted and buoyancy opposed mixed convection of a third‐grade fluid, which flows through vertically oriented parallel plates, subjected to uniform and constant wall heat fluxes, under the effect of an externally applied magnetic field, are investigated. The coupled, nonlinear conservation equations of momentum and energy are solved employing the collocation method (CM) and velocity and temperature distributions are solved semianalytically. The results produced by the CM and the results of exact solution are compared for the buoyancy assisted and buoyancy opposed flow of a Newtonian fluid through the vertically oriented parallel plates arrangement without the effect of the externally applied magnetic field. An excellent agreement is exhibited by demonstrating the efficacy of the CM. The effects of the third‐grade fluid parameter, Hartmann number, and mixed convection parameter on the dimensionless velocity, temperature, and Nusselt number are studied. The results imply that in the case of buoyancy assisted flow, an increment in the non‐Newtonian third‐grade fluid parameter causes a decrease in the fluid velocity near the plate walls, which finally causes an increase in the velocity in the central core of the plates. In buoyancy opposed flow, the effect of the same parameter is to oppose the flow reversal near the walls and with higher values of this parameter, it can totally prevent the flow reversal near the walls. The results of the present study can be useful in the fields of flow and heat transfer of various grades of polymers, paints, and food processing.

show abstract

Numerical investigation of turbulent aided mixed convection of liquid metal flow through a concentric annulus

Cited by 27 publications

References 35 publications

Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus

Large Eddy Simulation of Liquid Metal Turbulent Mixed Convection in a Vertical Concentric Annulus

A brief review of liquid heat transfer materials used in concentrated solar power systems and thermal energy storage devices of concentrated solar power systems

Magnetohydrodynamic mixed convection in a non‐Newtonian third‐grade fluid flowing through vertical parallel plates: A semianalytical study of flow and heat transfer

Contact Info

Product

Resources

About