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Nu-Ra correlations for natural convection at high Ra numbers in air-filled tilted hemispherical cavities with dome oriented upwards,Disk submitted to constant heat flux.

Abstract : The purpose of this paper is to propose correlations between Nusselt and Rayleigh numbers for the case of inclined and closed air-filled hemispherical cavities. The disk of such cavities is subjected to a constant heat flux. The study covers a wide range of Rayleigh numbers from 5×107 to 2.55×1012. – Correlations are obtained from numerical approach validated by experimental measurements on some configurations, valid for several angles of inclination of the cavity between 0° (horizontal disk) and 90° (vertical disk) in steps of 15°. – The statistical analysis of a large number of calculations leads to reliable results covering laminar, transitional and turbulent natural convection heat transfer zones. – The proposed correlations provide solutions for applications in several fields of engineering such as solar energy, aerospace, building, safety and security. – The new relations proposed are the first published for high Rayleigh numbers for this type of geometry. They supplement the knowledge of natural convection in hemispherical inclined cavities and constitute a useful tool for application in various engineering areas as solar energy (thermal collector, still, pyranometer, albedometer, pyrgeometer), aerospace (embarked electronics), building, safety and security (controlling and recording sensors).
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https://hal-univ-paris10.archives-ouvertes.fr/hal-01473773
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Submitted on : Wednesday, February 22, 2017 - 11:15:25 AM
Last modification on : Tuesday, November 19, 2019 - 9:42:28 AM

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Abderrahmane Baïri, Juan Mario María, Nacim Alilat, Najib Laraqi, Jean-Gabriel Bauzin. Nu-Ra correlations for natural convection at high Ra numbers in air-filled tilted hemispherical cavities with dome oriented upwards,Disk submitted to constant heat flux.. International Journal of Numerical Methods for Heat and Fluid Flow, Emerald, 2015, 25 (3), pp.504-512. ⟨10.1108/HFF-12-2013-0335⟩. ⟨hal-01473773⟩

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