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MIXED CONVECTION FLOW OVER A HORIZONTAL CIRCULAR CYLINDER WITH A CONSTANT SURFACE HEAT FLUX IN A NANOFLUID

DOI: 10.1615/ICHMT.2012.CHT-12.580
pages 949-969

L Tham
Universiti Malaysia Kelantan

Roslinda Nazar
School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Ioan Pop
Department of Applied Mathematics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania

Abstract

The laminar mixed convection boundary layer flow from a horizontal circular cylinder in a nanofluid, which is maintained at a constant surface heat flux, has been studied for both cases of a heated and cooled cylinder. The resulting system of nonlinear partial differential equations is solved numerically using an implicit finite-difference scheme. Three different types of nanoparticles are considered, namely Cu, Al2O3 and TiO2. The solutions for the flow and heat transfer characteristics are evaluated numerically and studied for various values of the governing parameters, namely the nanoparticle volume fraction φ and the mixed convection parameter λ. It is worth mentioning that heating the cylinder (λ > 0) delays the separation of the boundary layer and if the cylinder is hot enough (large values of λ > 0), then it is suppressed completely. On the other hand, cooling the cylinder (λ < 0) brings the boundary layer separation point nearer to the lower stagnation point and for a sufficiently cold cylinder (large values of λ < 0), the flow completely detaches from the cylinder.

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