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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v39.i6.90
pages 549-558

Numerical Comparison of the Effect of Concave and Convex Curvatures over the Rate of Heat Transfer from a Vertical Wall in Natural Convection Flow

Mehdi Salmanpour
Department of Mechanical Engineering, Azad Islamic University, Marvdasht Branch, Fars, Iran
O. Nourani Zonouz
Mechanical Engineering Department, Marvdasht Islamic Azad University, Fars, Iran

ABSTRAKT

The main aim of this article is determination of optimum geometric conditions that help the rate of heat transfer from isothermal vertical walls to be increased. The basic shape is a vertical flat plate. In order to understand the effect of curvature on the heat transfer rate, two different conditions were considered. In both of these cases, the length of the wall is divided into three parts. The first and third parts are completely flat; in the second part, a defining curvature was induced. In the first case, the curvature has a convex shape and, in the second one, the shape is concave. To fully consider the role of curvature, in each case the computation was repeated for 10 different radii. To make a proper domain for solving the governing equations, the physical domain and related governing equations of interest are transferred to the computational domain. To discretize the equations the finite difference scheme is used. The distribution of the Nusselt number and the total heat transfer rate were computed. For covering different Prandtl numbers, air and water were selected for the ambient fluid. The results show that the rate of heat transfer is decreased with making the concave shape and will be increased by using the convex shape. This increase in the magnitude of heat transfer is continued up to θ = 16.67° (curvature degree) for air. This limitation helps us to find an optimum angle for the rate of heat transfer.

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