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International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.452 SNIP: 0.68 CiteScore™: 1.18

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2017021952
pages 545-565

ENTROPY ANALYSIS OF UNSTEADY MAGNETOHYDRODYNAMIC NANOFLUID OVER STRETCHING SHEET WITH ELECTRIC FIELD

Yahaya Shagaiya Daniel
Department of Mathematical Sciences, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor,Malaysia; UTM Centre for Industrial and Applied Mathematics (UTM-CIAM), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR) Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Zainal Abdul Aziz
UTM Centre for Industrial and Applied Mathematics (UTM-CIAM), Ibnu Sina Institute for Scientific and Industerial Research (ISISIR), Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia; Department of Mathematical Sciences, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia; MYHIMS Solutions PLT, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Zuhaila Ismail
Department of Mathematical Sciences, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor,Malaysia; UTM Centre for Industrial and Applied Mathematics (UTM-CIAM), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR) Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Faisal Salah
Department of Mathematics, Faculty of Science, University of Kordofan, Elobied, 51111, Sudan

ABSTRACT

This paper reports the unsteady magnetohydrodynamic (MHD) natural convection flow of nanofluid over a permeable stretching sheet with buoyancy effects. Effects of Brownian motion and thermophoresis using a revised model are present. Entropy and heat transfer analysis is performed in the presence of viscous dissipation, Joule heating, and chemical reaction. Transformations techniques are applied to the constituted governing boundary layer equations to obtain a nonlinear couple of ordinary differential systems. Thereafter, the Keller-Box numerical method is applied to solve the problem and excellent agreement was found with those reported in the literature. The results corresponding to the velocity, temperature, concentration profiles, entropy generation and Bejan numbers profiles, tabular form for the skin friction, and the reduced Nusselt number for various pertinent parameters are examined. As the main outcome, our results show that on the flow field magnetic and electric fields exhibit opposite behavior; Hartmann number, Reynolds number, dimensionless Brinkman group, constant entropy parameter, and dimensionless group parameter intensify with entropy generation. Furthermore, thermal radiation, electric field, and Hartmann number gain the Bejan number.


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