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EXPERIMENTALAND THEORETICAL STUDY OF NATURAL CONVECTION HEAT TRANSFER OFHEATED SQUARE CYLINDER PLACED INSIDE A COOLED CIRCULAR ENCLOSURE FILLED WITH AIR | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 12, Issue 3, 2012, Pages 564-581 | ||
| Authors | ||
| and Abdul jabbarJwairShamikh; Laith Ayad Salman | ||
| Abstract | ||
| In this paper, an experimental and theoretical study of natural convection heat transfer in a closed ends annulus region formed by a heated square cylinder placed concentrically in a larger isothermally cooled circular cylinder. Experiments are carried out for Rayleigh number based on the equivalent annulus gap length ranges from 10 3 up to 10 6 . Different aspect ratios, 0.2 up to 0.5, are considered. The numerical simulation for the problem is carried out by using commercial CFD code (FLUENT 6.3).The average Nusselt number from the experimental results is compared with that obtained from the CFD code. The fluid flow and heat transfer characteristics for different operating and geometric conditions are illustrated through stream lines and isotherms contours that obtained from the CFD code. The results showed thatas the aspect ratio increases the heat transfer rateand the average Nusselt number increase. Also the result showed that as Rayleigh number increases the average Nusselt number increases. | ||
| Keywords | ||
| natural convection; heat transfer; Horizontal Annulus; circular enclosures; concentric cylinders | ||
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