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Technical Briefs

Effect of Magnetic Field on Heat Transfer in Non-Newtonian Nanofluids Over a Nonisothermal Stretching Wall

[+] Author and Article Information
Waqar A. Khan1

Department of Engineering Sciences, PN Engineering College,  National University of Sciences and Technology, Karachi 75350, Pakistanwkhan_2000@yahoo.com

Rama Subba Reddy Gorla

Department of Mechanical Engineering,  Cleveland State University, Cleveland, Ohio 44115r.gorla@csuohio.edu

1

Corresponding author.

J. Heat Transfer 134(10), 104502 (Aug 07, 2012) (5 pages) doi:10.1115/1.4006488 History: Received November 21, 2011; Accepted March 19, 2012; Published August 06, 2012; Online August 07, 2012

In this study, the effects of magnetic field on combined heat and mass transfer in non-Newtonian nanofluids over a stretching surface with prescribed wall temperature and uniform surface nanoparticle concentration are investigated numerically. A power-law model is used for non-Newtonian fluids, whereas Brownian motion and thermophoresis effects are incorporated in the nanofluid model. A set of similarity transformation is used to reduce mass, momentum, thermal energy, and nanoparticles concentration equations into nonlinear ordinary differential equations, which are solved numerically by using a fourth–fifth order Runge–Kutta–Fehlberg method. Effects of nanofluid parameters, suction/injection and temperature parameters, and generalized Pr and Le numbers on dimensionless functions, skin friction, local Nusselt, and Sherwood numbers are investigated in the presence of magnetic field and are shown graphically. The quantitative comparison of skin friction and heat transfer rates with the published results for special cases is shown in tabular form and is found in good agreement.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flow model and coordinate system

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Figure 2

Variation of dimensionless wall shear stress with magnetic and suction/injection parameters for different generalized Newtonian fluids

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Figure 3

Variation of dimensionless heat transfer rates with magnetic and non-Newtonian nanofluid parameters for different non-Newtonian nanofluids

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Figure 4

Variation of dimensionless mass transfer rates with nanofluid concentration, magnetic and non-Newtonian nanofluid parameters for different non-Newtonian nanofluids

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