Solar radiation and Lorentz force effects on Reiner-Rivlin nanofluid flow over a spinning disk with activation energy

Abstract

The enhancement of thermal efficiency in energy conversion processes holds great importance in numerous sectors. The addition of nanoparticles into working fluid helps in the attainment of improved thermal efficiency. Hence, the main objective of the present study is to examine the irreversibility of the flow of magnetized Reiner Rivlin nano-fluid over a stretchable rotating disk. The electrically conducted fluid takes into account in the presence of the induced electric field. The energy expression is characterized by exothermic or endothermic reactions with activation energy, radiation, Joule heating, dissipation effects and these phenomena are uniqueness of the current work. The disk surface is subjected to slip factor and suction/injection conditions. Impacts of random and thermophoresis diffusions are considered and investigated. The entropy rate is also incorporated. The system of ordinary differential equations (ODEs) is converted through the appropriate selection of variables. The ND-solve technique is utilized to approximate solutions. The physical explanation of the flow variables concerning velocity, thermal field and entropy optimization is provided. The computational results pertaining to Sherwood number, skin friction, and temperature gradient are discussed. Enhanced entropy generation occurs as the numeric values of the electric parameter, radiation parameter and Brinkman number increase. Therefore, motivated by the above practical application to attempt the present study.

Keywords

• Entropy optimization
• Exothermic/Endothermic reaction
• Electric and Magnetic fields
• Reiner-Revilin model
• Joule heating
• Activation energy