The tendency to design compact systems results in limited space for particular components and heat transfer processes, which influences the removal of heat. Therefore, new methods for heat transfer intensification are being designed. Coupling passive and active methods of heat transfer intensification seems to be a promising approach toward removing high-heat-rate values from a system. The main purpose of the investigation presented was numerical analysis of the influence of nanoparticle materials on the heat transfer processes occurring during thermal convection in the Rayleigh–Benard system configuration under a strong magnetic field environment. The combination of the usage of nanoparticles and a strong magnetic field as one of the options will be justified for its suitability in heat transfer processes. Two types of nanofluids were analysed, namely water-silver and water-copper oxide, with a 0.25 vol.% particle concentration, in both cases. The numerical approach considered the nanofluid as the two-phase fluid and was realised in Comsol Multiphysics. Due to the magnetic field, new forces appeared in the system. These forces depend on the magnetic field orientations, and in one orientation, they caused the transfer of higher heat rates by copper oxide nanofluid by 15 %, while the second one saw the attenuation of natural convection. Silver nanoparticles, because of their weaker magnetic character, intensified heat transfer by approximately 10 %. Therefore, copper oxide seems to be a better option for industrial applications.
Roszko et al. (Sun,) studied this question.