Shahid Chamran University of AhvazJournal of Applied and Computational Mechanics2383-45367420211001Heat Transfer Enhancement and Boundary Layer Separations for a Hybrid Nanofluid Flow past an Isothermal Cylinder209621121694910.22055/jacm.2021.37795.3087ENNepal ChandraRoyDepartment of Mathematics, University of Dhaka, Dhaka, Bangladesh0000-0002-5623-9614AyshaAkterDepartment of Mathematics, University of Dhaka, Dhaka, Bangladesh0000-0002-5853-3593Journal Article20210621Unsteady magnetohydrodynamic mixed convection flow of an incompressible hybrid nanofluid (Cu-Al<sub>2</sub>O<sub>3</sub>/water) past an isothermal cylinder with thermal radiation effect has been studied. Appropriate non-dimensional variables are initiated to reduce the governing equations into a convenient form. By utilizing the procedure of finite difference, reduced equations are then solved for all time. Besides, series solutions are obtained using perturbation technique for short time and asymptotic method for long time which agree with the acquired numerical solution up to a good accuracy. When the mixed convection parameter <em>Ri</em>, radiation conduction parameter <em>R<sub>d</sub></em>, magnetic field parameter <em>M</em> and the volume fractions of nanoparticles <em>ϕ</em><sub>1</sub> and <em>ϕ</em><sub>2</sub> are increased, the local skin friction coefficient and the local Nusselt number are found to increase. Results revealed that the hybrid nanofluid (Cu-Al<sub>2</sub>O<sub>3</sub>/water) enhances the heat transfer about 28.28% in comparison to the Al<sub>2</sub>O<sub>3</sub>-water nanofluid and about 51.15% than the pure fluid. Contrary to this, the heat transfer of hybrid nanofluid is augmented about 41.76% than the Cu-water nanofluid and 71.41% than the base fluid. The streamlines and isotherms reveal that higher values of <em>Ri</em>, <em>M</em> and <em>R<sub>d</sub></em> delay the boundary layer separation and accordingly shrink the vortices. Moreover, the thermal boundary layer is thickened for the increment of aforesaid quantities. The surface temperature parameter augments the local skin friction coefficient, however, the reverse characteristic is observed for the local Nusselt number.https://jacm.scu.ac.ir/article_16949_a9a06ad5726852c728a22976f828b484.pdf