Entropy analysis of magnetohydrodynamic flow and heat transfer due to a stretching cylinder

• Magnetohydrodynamic flow and heat transfer over a stretching cylinder are considered.
• Entropy effects are investigated through graphs.
• Results are compared with a previous study to validate our solution technique.
• Magnetic field causes the entropy production rate to increase.
• Viscous effects are also responsible for entropy production.

The present work investigates the entropy generation effects in magnetohydrodynamic flow and heat transfer over a stretching cylinder. By using suitable similarity transformations, the governing partial differential equations are reduced into non-linear ordinary differential equations which are then solved numerically. Expressions for coefficient of skin friction, Nusselt number, entropy generation number are obtained in dimensionless form. The effects of various parameters on these quantities are presented through tables and graphs. A comparison of entropy generation due to heat transfer and entropy effects due to fluid friction and magnetic field is made with the help of Bejan number. The influence of different parameters involved in the problem on Bejan number is also shown with the aid of graphs.