Optimization of entropy generation in motion of magnetite-Fe3O4 nanoparticles due to curved stretching sheet of variable thickness
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 25 June 2019
Issue publication date: 11 September 2019
Abstract
Purpose
Investigation for convective flow of water-based nanofluid (composed of ferric oxide asnanoparticles) by curved stretching sheet of variable thickness is made. Bejan number andentropy generation analysis is presented in presence of viscous dissipation, mixed convectionand porous medium.
Design/methodology/approach
In this paper, by using NDSolve of MATHEMATICA, the nonlinear system of equations is solved. Velocity, temperature, Bejan number and entropy generation for involved dimensionless variables are discussed.
Findings
Increase in velocity is depicted for larger curvature parameter, and opposite trend is witnessed for higher nanoparticle volume concentration. Enhancement in temperature is seen for higher Eckert number while reverse behavior is noticed for larger curvature parameter. Entropy rate increases for variation of curvature parameter, Brinkman number and nanoparticle volume fraction. Bejan number decays for mixed convection and curvature parameters.
Originality/value
To the authors’ knowledge, there exists no study yet which describes flow by curved sheet of variable thickness. Such consideration with nanoparticles seems important task. Thus, the main objective here is to determine entropy generation in ferromagnetic nanofluid flow due to variable thickened curved stretching surface. Additionally, effects of Joule heating, porous medium, mixed convection and viscous dissipation are taken into account.
Keywords
Acknowledgements
The authors are grateful to Higher Education Commission (HEC) of Pakistan for financial support of this work under the project number No. 20-3038/NRPU/R&D/HEC/13.
Citation
Qayyum, S., Hayat, T. and Alsaedi, A. (2019), "Optimization of entropy generation in motion of magnetite-Fe3O4 nanoparticles due to curved stretching sheet of variable thickness", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 9, pp. 3347-3365. https://doi.org/10.1108/HFF-12-2018-0782
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited