Khetib, YacineAlahmadi, AhmadAlzaed, AliSharifpur, MohsenCheraghian, GoshtaspSiakachoma, Cornelius2022-07-202022-07-202022-11Khetib, Y., Alahmadi, A., Alzaed, A., Sharifpur, M., Cheraghian, G. & Siakachoma, C. Simulation of a parabolic trough solar collector containing hybrid nanofluid and equipped with compound turbulator to evaluate exergy efficacy and thermal- hydraulic performance. Energy Science and Engineering 2022; 10(11): 4304–4317. doi:10.1002/ese3.975.2050-0505 (online)10.1002/ese3.975https://repository.up.ac.za/handle/2263/86336This research is mainly aimed at investigating the numerical modeling of thermal- hydraulic and exergy efficiencies of parabolic trough solar collectors (P- SCs) filled with magnetic hybrid nanofluid. The k- epsilon turbulence, S2S, and mixture models were used to simulate the turbulence equations, radiation, and two- phase nanofluid, respectively. The experiments were run using mag-netic nanofluid in Reynolds numbers of 5000- 20 000, the volume fractions of 1%- 3%, and the ratios of pitch (ROPs) of 1, 2, and 3 of the combined turbula-tor. According to the results, there is a significant increase in average Nusselt number (Nu) and pressure drop (ΔP) with increasing Reynolds number, nano- additive concentration, and ROP. Moreover, the use of the hybrid magnetic tur-bulator and hybrid nanofluid increased the thermal performance of the P- SC. It was also found that the Reynolds number of 20 000 and volume fraction of 3% of nanoparticles resulted in the optimal exergy efficiency mode in using a hybrid turbulator.en© 2021 The Authors. Energy Science & Engineering published by Society of Chemical Industry and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License.Compound turbulatorExergy efficiencyMagnetic hybrid nanofluidParabolic trough solar collectors (P-SCs)Performance evaluation criterion (PEC)Two-phase flowEngineering, built environment and information technology articles SDG-04SDG-04: Quality educationEngineering, built environment and information technology articles SDG-07SDG-07: Affordable and clean energyEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionEngineering, built environment and information technology articles SDG-13SDG-13: Climate actionEngineering, built environment and information technology articles SDG-17SDG-17: Partnerships for the goalsArticle