Entropy Generation in a Chemically Reactive MHD Unsteady Micropolar Nanofluid Flow with Activation Energy over an Inclined Stretching Sheet: A Buongiorno Model Approach

Aarathi, T; Reddy, A Subramanyam; Jagadeshkumar, K; Ramachandra Prasad, V; Beg, O

Abstract

The goal of this research is to inspect the heat and mass transfer trends and entropy generation in a time-reliant stagnation point stream of a micropolar fluid across an inclined stretched surface. For this objective, a chemically reactive, electrically conducting fluid exposed to an orthogonal magnetic field is studied. The flow governing equations are modelled using Buongiorno model and are reformed to a system of higher order ordinary differential equations by administering appropriate similarity transformations. This system is quantitatively examined by employing the 4 th order Runge-Kutta scheme with shooting approach. The effects of thermal radiation, magnetic field, uniform heat source/sink, Brownian motion, thermophoresis, activation energy, and binary chemical reaction are studied on velocity, microrotation, temperature, and concentration profiles. It is observed that magnetic field and Brownian motion elevate the flow temperature. Increased activation energy spikes the fluid concentration while increase in binary chemical reaction reduces the particle concentration. Later, impact of various parameters on skin friction coefficient and heat and mass transfer rates are tabularised. Increasing values of thermophoretic diffusion parameter, Brownian diffusion parameter, and chemical reaction parameter improve the rate of mass transfer. Unsteadiness parameter triggers the skin friction coefficient 53.2% when the parameter value was increased from 0.7 to 1.0. Viscous dissipation and thermal radiation increase the rate of entropy generation. A comparison of skin friction coefficient with previous studies demonstrates a strong agreement.

Citation

Aarathi, T., Reddy, A. S., Jagadeshkumar, K., Ramachandra Prasad, V., & Beg, O. (in press). Entropy Generation in a Chemically Reactive MHD Unsteady Micropolar Nanofluid Flow with Activation Energy over an Inclined Stretching Sheet: A Buongiorno Model Approach. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering,

• Journal Article Type: Article
• Acceptance Date: Jun 6, 2024
• Deposit Date: Jun 22, 2024
• Journal: Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
• Print ISSN: 0954-4089
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Keywords: Activation energy; Binary chemical reaction; Brownian motion; Magnetohydrodynamics; Micropolar nanofluid; Stagnation point flow