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Corresponding Author

Mohamed, M.

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

Experimental and Numerical investigation in fluid flow and heat transfer have been carried out to study the effect of blockage ratio (d/H) and aspect ratio ((c/d) due to free separation around rectangular bars. The turbulent flow and forced convection heat transfer characteristics for an incompressible and steady flow past rectangular bars were carried out. The Reynolds numbers was varied from 1.5x104 up to 3.5x104, blockage ratios of 0.167, 0.133, 0.1 and 0.067, aspects of 1, 1.25, 1.67 and 2.5 and input power of 41.4, 53.16 and 66.4w. The velocity profiles and forced convection heat transfer coefficient were predicted numerically using Fluent code. The two equations of turbulence model (RNG K-Epsilon) were employed in this investigation. The experimental results showed that Nusselt number is strongly affected by both blockage ration and Reynolds number. Nusselt number was not strongly affected by the power (heat flux). The experimental results also showed that the velocity distribution behind the bars is affected by blockage ratio, aspect ratio and Reynolds number. The numerical and experimental results of the present work were compared with available literature data and showed good agreement

Keywords

turbulent flow; heat transfer; Aspects Ratio; Blockage Ratio; Cross Bars

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