Abstract
The forced convection heat transfer over a rounded cornered square cylinder has been maximized by optimizing the corner radius in two-dimensional unsteady flow regime for the range of Re, 100–180 and corner radius ‘r’, 0.50–0.71 at Pr = 0.71 (air). The heat transfer characteristics over the rounded cornered square cylinder are analyzed with the isotherm patterns, local Nusselt number (Nu local), average Nusselt number (Nu avg) at various Reynolds numbers and for various corner radii. These numerical results were obtained by solving the two-dimensional unsteady Navier–Stokes equations using a finite volume method-based commercial code FLUENT. The optimization method has been performed by genetic algorithm (GA) and particle swarm optimization (PSO), and it is found that the heat transfer rate of a circular cylinder can be enhanced 9 % by introducing a new cylinder geometry of corner radius r = 0.51 and also found that the PSO is more efficient than the GA.
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