Natural convection in horizontal annulus with fins attached to inner cylinder

Journal Article

, Alshahrani, D. . 2006

• المجلة \ الصحيفة: Int. J. Heat and Technology
• رقم العدد: 2
• رقم الإصدار السنوي: 24
• الصفحات: 159-168

مستخلص المنشور

Natural convection heat transfer between two horizontal concentric cylinders with two fins attached to the inner cylinder was numerically investigated using finite element technique together with SIMPLER algorithm. Laminar conditions up to Rayleigh number Rai of 5×10 4 were investigated as well as effects of annulus diameter ratio, fin length and fin inclination angle on this type of flow. A conduction thermal resistance of finned annulus was obtained by means of conduction heat transfer analysis. The thermal resistance decreases as fin length increases or as annulus diameter ratio decreases. Results of natural convection in finned annuli are presented in the forms of streamlines and isothermal plots. Data of heat transfer in annuli are presented in terms of Nusselt number and effective thermal conductivity ratio ke/k versus Rayleigh number. Correlation for thermal conductivity ratio is proposed. The prediction of the proposed correlation fit the current data of effective thermal conductivity ratio of finned annulus with a margin of error of-6 to +15%.