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2013 (Vol. 6, Issue: 10)
Article Information:

Mixed Convection Boundary-layer Flow of a Nanofluid Near Stagnation-point on a Vertical Plate with Effects of Buoyancy Assisting and Opposing Flows

Hossein Tamim, Saeed Dinarvand, Reza Hosseini, Sadegh Khalili and Arezoo Khalili
Corresponding Author:  Saeed Dinarvand 

Key words:  Boundary layer, mixed convection, nanofluid, numerical solution, stagnation-point flow, similarity transform,
Vol. 6 , (10): 1785-1793
Submitted Accepted Published
November 12, 2012 January 21, 2013 July 20, 2013
Abstract:

In this study, the steady laminar mixed convection boundary layer flow of a nanofluid near the stagnation-point on a vertical plate with prescribed surface temperature is investigated. Here, both assisting and opposing flows are considered and studied. Using appropriate transformations, the system of partial differential equations is transformed into an ordinary differential system of two equations, which is solved numerically by shooting method, coupled with Runge-Kutta scheme. Three different types of nanoparticles, namely copper Cu, alumina Al2O3 and titania TiO2 with water as the base fluid are considered. Numerical results are obtained for the skin-friction coefficient and Nusselt number as well as for the velocity and temperature profiles for some values of the governing parameters, namely, the nanoparticle volume fraction parameter &Phiand mixed convection parameter &lambda It is found that the highest rate of heat transfer occurs in the mixed convection with assisting flow while the lowest one occurs in the mixed convection with opposing flow. Moreover, the skin friction coefficient and the heat transfer rate at the surface are highest for copper–water nanofluid compared to the alumina–water and titania–water nanofluids.
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  Cite this Reference:
Hossein Tamim, Saeed Dinarvand, Reza Hosseini, Sadegh Khalili and Arezoo Khalili, 2013. Mixed Convection Boundary-layer Flow of a Nanofluid Near Stagnation-point on a Vertical Plate with Effects of Buoyancy Assisting and Opposing Flows.  Research Journal of Applied Sciences, Engineering and Technology, 6(10): 1785-1793.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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