Natural convective heat transfer within nanofluid-filled hemispherical horizontal enclosure

7th European Thermal-Sciences Conference

Haddad, O.^1 ; Baïri, A.^1

Université Paris Ouest, Laboratoire Thermique Interfaces Environnement (LTIE) EA 4415, Département GTE, 50, Rue de Sevres, Ville d'Avray

F-92410, France^1

关键词: Constant heat flux;    Convective heat transfer;    Metallic nanoparticles;    Natural convective heat transfers;    Numerical approaches;    Rayleigh number;    Steady-state natural convection;    Volumetric fractions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032161/pdf
DOI  :  10.1088/1742-6596/745/3/032161

来源: IOP

【 摘 要 】

This survey deals with some steady-state natural convection taking place in a hemispherical enclosure filled with nanofluid consisting of water based metallic nanoparticles, with volumetric fraction ranging between 0% (pure water) and 20%. The hot active wall of the cavity is its horizontal disk subjected to a wide range of constant heat fluxes. The 3D numerical approach is done by means of the finite volume method based on a mixture model. Temperature and velocity distributions are presented for some typical cases and the heat transfer is quantified by means of the Nusselt number versus Rayleigh number. A comparison done between the results with the water and the nanofluid clearly confirms enhancement of the convective heat transfer with the nanoparticles.