Title: Entropy generation effects in MHD Casson nanofluid past a permeable stretching surface

Authors: Adnan Saeed Butt; Khadija Maqbool; Syed Muhammad Imran; Babar Ahmad

Addresses: Department of Mathematics, Government Gordon College, Liaquat Road Rawalpindi, 46000 Pakistan ' Department of Mathematics and Statistics, FBAS, IIUI, Islamabad, Pakistan ' Department of Mathematics, Government Gordon College, Liaquat Road Rawalpindi, 46000 Pakistan ' Department of Mathematics, Comsats University Islamabad, Pakistan

Abstract: The primary focus of the present study is to analyse the effects of entropy generation on hydromagnetic Casson nanofluid flow past a permeable stretching surface with convective heat and mass boundary conditions. The problem is given mathematical formulation and partial differential equations are converted into system of nonlinear ordinary differential equations by suitable similarity variables. The transformed problem is solved analytically by Homotopy-Pade' method and numerically by shooting technique coupled with fourth fifth order Runge-Kutta-Fehlberg method. The results are compared with existing literature under limiting conditions and are found to be in excellent agreement. The effects of pertinent parameters on entropy generation are displayed by plotting graphs of local entropy generation number, averaged entropy generation number and Bejan number. The results are discussed in detail. It is found that magnetic field parameter, thermal Biot number and solutal Biot number have increasing effects on entropy generation whereas increase in Casson fluid parameter causes entropy production to decrease.

Keywords: Casson nanofluid; entropy generation; stretching sheet; convective heat; mass conditions.

DOI: 10.1504/IJEX.2020.105481

International Journal of Exergy, 2020 Vol.31 No.2, pp.150 - 171

Received: 28 May 2019
Accepted: 11 Aug 2019

Published online: 24 Feb 2020 *

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