Effect of Prandtl number on the turbulent thermal field in annular pipe flow

Ould-Rouiss, Meryem; Redjem-Saad, L.; Lauriat, Guy; Mazouz, A.

doi:10.1016/j.icheatmasstransfer.2010.06.027

Cited by 22 publications

(5 citation statements)

References 12 publications

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“…Actually, the DNS of Ref. [16] is for a fluid with Pr = 0.026 at the same Reynolds number of the present investigation, but for a radius ratio of α = 0.1. It should be remarked that the reference DNS data from Ref.…”

Section: Resultsmentioning

confidence: 69%

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

Marocco

Garita

2018

Journal of Heat Transfer

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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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Section: Resultsmentioning

confidence: 69%

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

Marocco

Garita

2018

Journal of Heat Transfer

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“…Fully-developed particle-laden non-isothermal turbulent channel flow [25] is investigated using Direct Numerical Simulation (DNS) combined with the Lagrangian particle tracking technique, which is used to track a large number of individual particles, using the point-particle approach.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of the passive heat transfer in a turbulent flow with particle

2017

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Abstract. Turbulent non-isothermal fully developed channel flow with solid particles was investigated through Direct Numerical Simulation combined with the point-particle approach. The focus was on the interactions between discrete and continuous phase and their effect on the velocity and the temperature of the particles. It has been found that low momentum inertia particles have a mean temperature similar to the fluid temperature and this effect is almost independent of particle thermal inertia. For particles with larger momentum, the inertia thermal effect is more complex, particle temperature in the near-wall and buffer region is significantly lower than the fluid temperature. The difference between the fluid mean temperature and particle mean temperature increases along with the momentum response time. This may have important consequences on the chemical reactions, technological processes and on the accuracy of temperature measurement techniques based on seeding particle.

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“…It is found that the time-averaged Nusselt number is apparently increased by horizontally placing the top side of the inner triangular cylinder for Gr ≥ 10 5 . Ould-Rouiss et al [6] are investigated the effect of Prandtl number on the turbulent thermal statistics in fully developed annular pipe flow, with isoflux boundary conditions. The Prandtl number has marked influence on the thermal field.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Study of MHD Thermosolutal Convection in a Square Cavity for Different Prandtl Numbers

Bouabid¹,

Brahim²

2012

MECHANICS

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Thermosolutal convection in a square cavity filled with Boussinesq fluid is numerically investigated. The cavity is heated along the active walls whereas the two other walls of the cavity are adiabatic and insulated. Entropy generation due to heat and mass transfer, fluid friction and magnetic effect has been determined in transient state for laminar flow by solving numerically the continuity, momentum energy and mass balance equations, using a Control Volume Finite-Element Method. The structure of the studied flows depends on six dimensionless parameters which are the Prandtl number, the thermal Grashof number, the buoyancy ratio, the Lewis number, the Hartman number and the inclination angle of the magnetic field. Results show that the magnetic field parameter has reducing the flow in the cavity and this lead to a decrease of entropy generation, Temperature decreases with increasing the value of the magnetic field parameter. The average Nusselt number increases with the Prandtl number and, in particular, its effect is more evident at high Hartmann numbers.

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Effect of Prandtl number on the turbulent thermal field in annular pipe flow

Cited by 22 publications

References 12 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

Direct numerical simulation of the passive heat transfer in a turbulent flow with particle

Entropy Generation Study of MHD Thermosolutal Convection in a Square Cavity for Different Prandtl Numbers

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