Unsteady hybrid nanofluid flow over a convectively heated cylinder with inclined magnetic field and viscous dissipation: A multiple regression analysis

Abstract

The current study explores the aspects of unsteady stagnation point flow of hybrid nanofluid (Cu-Al2O3/H2O) over a continuously moving and convectively heated stretching cylinder under the influence of oblique Lorentz force. The impacts of velocity slip, Joule dissipation, thermal radiation, viscous dissipation and internal heat generation are also incorporated into this study. Appropriate thermo-physical relations for the hybrid nanofluid are accomplished by following the Xue model. With the use of suitable similarity transformations, the governing dimensional mathematical equations are converted into dimensionless forms. Numerical solutions are obtained for the velocity and energy fields with the help of a shooting technique based on the Runge–Kutta–Fehlberg method of 5-th order and secant iteration. Graphical and tabular representations of numerical data are used to explore the physical impacts of various pertinent parameters on the hybrid nanofluid velocity and temperature. The stability of this approach and the validity of the obtained results are illustrated by comparing the current findings to previously reported data for a specific case. Further, the multiple (quadratic) regression analysis is performed to show the dominance of physical parameters on local skin-friction coefficient and Nusselt number. The thermal buoyancy force boosts the fluid flow while a reverse trend is observed for the magnetic and the velocity slip parameters. Heat transfer rate at the surface is improved with the enhancement in Biot number, thermal radiation and unsteadiness parameters.