Water–Copper Nanofluid Free Convective Heat Transfer Between Concentric Cones

Abstract

Natural convective heat transfer has been quantified around a right conical electronic assembly generating during operation a constant heat flux and contained in a coaxial conical enclosure maintained isothermal at low temperature. Heat exchange is done through a water based-copper nanoparticle whose volume fraction varies between 0% (pure water) and 10%. Nusselt number based on the generated heat flux and distance between the cones has been determined in a wide range of the Rayleigh number varying between 3.32 × 10⁵ and 6.74 × 10⁷. The results of this work show that the natural convective heat transfer is between 7.5 and 24.4% higher than those concerning a cubic assembly cooled by means of a water base-ZnO nanofluid. A new correlation of the Nusselt–Rayleigh type is proposed, obtained by means of a three-dimensional numerical approach based on the volume control method using the SIMPLE algorithm. It can be used for the correct thermal sizing of the considered electronic assembly.

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Abderrahmane Baïri

Abderrahmane Baïri is a Professor at the University of Paris and Head of Heat and Mass Transfer Laboratory. His main teaching activities are related to heat transfer, experimental techniques, and numerical methods. His research is carried out in the Laboratoire de Thermique Interfaces Environnement (LTIE, University of Paris) and deals with natural convection, heat transfer at solid-solid/solid-fluid interfaces, nanofluids, porous media and thermal characterization of materials.