Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 21 3 2025 09 30 Magnetohydrodynamic Flow and Heat Transfer Enhancement with Al2O3-Cu Hybrid Ionanofluids over an Exponentially Stretching/Shrinking Permeable Sheet with Heat Generation and Slip Effects 123 136 738622 10.22034/ijnn.2025.2066935.2685 EN Abanti Datta Department of Mechanical Engineering, Institute of Engineering and Management, School of University of Engineering and Management (UEM), Kolkata, Saltlake Sector V, Kolkata – 700 091, India 0000-0001-9023-967X Arka Banerjee Department of Mechanical Engineering, Dr. B. C. Roy Engineering College, Durgapur- 713206, India 0000-0001-9329-4033 Sayantan Mukherjee Department of Mechanical Engineering, Gandhi Academy of Technology and Engineering, Brahmapur, Odisha,761008, India 0000-0003-4896-0329 Journal Article 2025 07 25 Efficient heat transfer fluids are pivotal for high-performance thermal management systems. Although Conventional nanofluids exhibit improved thermal properties, their practical applications are often hindered by agglomeration and flow instability. To overcome these challenges, this study investigates a hybrid ionanofluid, comprising Al2O3 and Cu nanoparticles dispersed in a water–[C2mim] [CH3SO3] ionic liquid mixture under magnetohydrodynamic (MHD) boundary-layer (BL) flow conditions. The study focuses on analyzing how magnetic field strength, heat generation, suction, velocity and thermal slip influence the flow and heat transfer characteristics over an exponentially stretching or shrinking permeable surface. The governing partial differential equations are transformed via similarity variables and solved numerically using MATLAB’s bvp4c solver. A linear stability analysis is further performed to distinguish the physically realizable solution branch in cases of dual solutions. The results demonstrate that the hybrid ionanofluid substantially enhances both skin friction and heat transfer rates compared to conventional hybrid nanofluids, due to the combined effects of ionic liquid properties and nanoparticle synergy. Quantitatively, increasing Cu fraction (from 0.001 to 0.01) raises the local Nusselt number by ~1.7% and skin-friction coefficient by ~2.7%, while delaying bifurcation onset by ~5.4% and lowering suction threshold by ~2.3%. The findings highlight the superior heat transfer capability of hybrid ionanofluids and establish their potential as next-generation working fluids in advanced thermal systems. https://www.ijnnonline.net/article_738622_e889dec6c5649940a6c8f1d0a1adc063.pdf