Optimization of entropy generation in flow of micropolar mixed convective magnetite (Fe3O4) ferroparticle over a vertical plate

• Main Authors: A. Zaib, Umair Khan, Zahir Shah, Poom Kumam, Phatiphat Thounthong
• Format: Article
• Language: English
• Published: Elsevier 2019-12-01
• Series: Alexandria Engineering Journal
• Online Access: http://www.sciencedirect.com/science/article/pii/S1110016819301401

In this article, a comprehensive analysis is performed for the micropolar magnetite-Fe3O4 Ferro-liquid from a vertical plate using the mixed convective flow. An entropy analysis is executed to determine the disorder of the magnetite particles and micropolar fluid. To analyze the buoyancy effects, results are confined for opposing and assisting flows. A mathematical model is constructed, that is based upon the micro rotation vector, momentum equation and energy equations. Entropy generation process and all related effects are also considered for said model. By using the similarity transformation, obtained PDE’s transmuted into the system of nonlinear ODE’s and then numerical simulation is performed by Keller box technique. Results of concerned influential parameters on temperature, velocity, microrotation velocity within the domain of the constraint are demonstrated through graphs. In order to check the performance of heat transfer and flow behavior at the plate, the coefficient of the skin friction and the Nusselt number are also analyzed. Results reveal that the multiple results are attained in the “opposing flow” while the single result is appearing in the “assisting flow”. Moreover, the ferroparticle volume fraction accelerates the boundary-layer separation, while the micropolar parameter delays the boundary-layer separation. Keywords: Micropolar fluid, Mixed convection, Entropy generation, Magnetite-Fe3O4, Keller-box technique