INVESTIGATION OF NANOFLUID-INDUCED HEAT TRANSFER ENHANCEMENT IN A VERTICAL ROTATING SYSTEM USING CFD

Résumé

Heat transfer enhancement using nano-fluids has gained significant attention over the past few years. Nano-fluids are potentially applicable as alternative coolants for many areas such as electronics, automotive, air conditioning, power generation and nuclear applications.This study presents an analytical investigation of the heat-transfer performance of water-based. Nanofluids containing copper oxide (CuO), aluminum oxide (Alâ‚‚O₃), and zinc oxide (ZnO) in a vertical rotating system. The effects of nanoparticle material, volume concentration, and rotational speed on the thermal and hydrodynamic behaviour are examined in detail. By applying boundary-layer theory and employing similarity transformations, the governing partial differential equations are reduced to a set of nonlinear ordinary differential equations, which are subsequently solved using numerical techniques.The results indicate that the incorporation of nanoparticles substantially enhances the heat-transfer rate relative to the base fluid. Among the nanofluids considered, CuO–water exhibits the highest thermal conductivity, followed by Alâ‚‚O₃–water and ZnO–water. Furthermore, rotational motion significantly influences the velocity distribution and the thickness of the thermal boundary layer.Overall, the findings demonstrate the strong potential of nanofluids to improve heat-exchange efficiency in rotating systems. This work provides useful insights for the design and thermal management of rotating machinery and related industrial applications.