Experimental investigation of heat transfer coefficient in pool boiling of hybrid nanofluid over grooved surfaces

Heat transfer in pool boiling is known as a complex and critical process in thermal systems. Considering the escalating need for higher efficiencies, using nanofluids as an efficient fluid in addition to modifications to surface geometry- particularly grooved surfaces- has been identified as an effective strategy for enhancing the heat transfer coefficient. This research seeks to explore the experimental effects of a hybrid graphene oxide-iron oxide/water nanofluid combined with grooved surfaces on the convective heat transfer coefficient during pool boiling. Tests were performed using a hybrid nanofluid with a 0.05% volumetric concentration on surfaces featuring diverse groove configurations. The findings demonstrated that the use of hybrid graphene oxide-iron oxide/water nanofluid alongside grooved surfaces substantially enhances the heat transfer coefficient. This enhancement stems from the synergistic influence of nanoparticles and surface geometry on the boiling process, coupled with increased turbulence in the liquid boundary layer. Among the tested configurations, the circular surface in the hybrid nanofluid exhibited the highest heat transfer coefficient improvement. Compared to a smooth surface with deionized water, the heat transfer coefficient increased by 67%. This study offers promising insights for advancing heat transfer technologies and designing advanced cooling systems. It also introduces the use of hybrid nanofluids along with engineered surfaces as a new approach to optimizing thermal processes.