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Technical Briefs

Natural Convective Boundary-Layer Flow Over a Vertical Cylinder Embedded in a Porous Medium Saturated With a Nanofluid

[+] Author and Article Information
Rama Subba Reddy Gorla

Department of Mechanical Engineering,
Cleveland State University,
Cleveland, OH 44115
e-mail: r.gorla@csuohio.edu

Waqar Khan

Department of Engineering Sciences,
PNS Jauhar,
National University of Sciences and Technology,
Karachi 75350, Pakistan

Manuscript received April 3, 2012; final manuscript received October 2, 2012; published online January 18, 2013. Assoc. Editor: Malisa Sarntinoranont.

J. Nanotechnol. Eng. Med 3(3), 034501 (Jan 18, 2013) (5 pages) doi:10.1115/1.4007886 History: Received April 03, 2012; Revised October 02, 2012

In this paper, a boundary layer analysis is presented for the natural convection past a vertical cylinder in a porous medium saturated with a nanofluid. Numerical results for friction factor, surface heat transfer rate, and mass transfer rate have been presented for parametric variations of the buoyancy ratio parameter Nr, Brownian motion parameter Nb, thermophoresis parameter Nt, and Lewis number Le. The dependency of the friction factor, surface heat transfer rate (Nusselt number), and mass transfer rate on these parameters has been discussed. The results indicate that as Nr, Nb, and Nt increase, the friction factor and heat transfer rate (Nusselt number) decrease. The mass transfer rate (Sherwood number) increases with Le, Nb, and Nt.

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Figures

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Fig. 1

Flow model and coordinate system

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Fig. 4

Variation of dimensionless mass transfer rates with Lewis number and nanofluid parameters for different values of nonsimilar parameter

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Fig. 3

Variation of dimensionless heat transfer rates with buoyancy and nanofluid parameters for different values of nonsimilar parameter

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Fig. 2

Variation of skin friction with buoyancy and nanofluid parameters for different values of nonsimilar parameter

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