Influence of Fe2O3 hybridization in MWCNT and graphene nanoparticles separately on the performance of H-theta Chevron corrugated Plate heat exchanger

High-theta chevron corrugated plate heat exchanger is tested with two hybrid nanofluids prepared using Fe 2 O 3 /graphene and Fe 2 O 3 /MWCNT at various concentrations and Reynolds numbers. The hybridization resulted in stable nanofluids with enhanced thermal conductivity due to effective functionalization and synthesis. The results indicated that at an 8 L/min mass flow rate of Fe 2 O 3 /graphene, and Fe 2 O 3 /MWCNT of 0.03 % nanofluid, enhancement by 35 % and 17 % achieved compared to water. It is observed that the F 2 O 3 /graphene hybrid showed improved Nusselt numbers and overall heat transfer coefficient, enhancing PHE efficiency. Higher concentrations of nanoparticles improved heat transfer performance, but increased pressure drops and pumping power. Both FM-0.03 % and FG-0.03 % nanofluids significantly reduced entropy production, with FG-0.03 % being the most effective. However, performance decreased at higher Reynolds numbers due to viscosity and agglomeration issues. The study emphasizes the necessity for thorough testing and long-term stability assessments to optimize nanofluids for practical use, suggesting that combining metal oxides. • High theta chevron PHE tested with Fe 2 O 3 /graphene and MWCNT hybrid nanofluids. • FG-0.03 % achieved 35 % heat transfer improvement over water at 8 L/min. • Higher nanoparticle concentrations enhance heat transfer but increase pressure drops. • FG-0.03 % shows lowest entropy generation, optimizing thermal performance. • Need for long-term stability tests to ensure practical nanofluid applications.