Numerical investigations on the entropy generation and heat transfer of an unsteady micropolar hybrid nanofluid flow over an inclined stretching surface

Abstract

Studies on stagnation point flow on inclined surfaces have gained momentum in recent times due to its application in a variety of fields. This study aims at the heat transfer properties of an incompressible unsteady stagnation point flow of a non-Newtonian micropolar hybrid nanofluid over an inclined stretching sheet with thermal radiation, viscous dissipation, and Joule heating. The governing equations of the problem are transformed into a system of ordinary differential equations by employing similarity variables. They are then solved numerically using the Runge-Kutta 4${\mathrm{ }}^{\mathit{\text{th}}}$ order method along with the shooting approach. Numerical solutions on velocity, microrotation, and temperature distribution along with entropy generation and Bejan number are consolidated graphically and those on heat transfer rate and skin friction coefficient are tabulated. The results indicate that the heat transfer rate is higher in hybrid nanofluid as compared to that of mononanofluid, the angle of inclination of the sheet is unfavorable for the velocity profile, and the temperature of the hybrid nanofluid escalates with a rise in viscous dissipation. Entropy generation rate is reduced when the Hartmann number is increased and the Bejan number diminishes with elevating viscous dissipation. The results were validated using existing studies and comparing heat transfer rate values between the present results and the results obtained from NDSolve.

Keywords:

• Entropy generation
• hybrid nanofluid
• Joule heating
• micropolar fluid
• stagnation point flow

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

There was no specific grant for this research from any funding organization in the public, private, or nonprofit sectors.