Abstract
Detailed numerical calculations are performed for investigating the effect of fin number and position on unsteady natural convection heat transfer in internally finned horizontal annulus. The SIMPLER algorithm with Quick scheme is applied for solving the Navier Stokes equations of flow and heat transfer. The results show that the heat transfer rate in annulus with fins increases with the increasing numbers of fin and Rayleigh numbers. For Ra = 2 × 105, the effect of numbers of fins and fins position at the bottom part on the unsteady solutions can be neglected, because the self-oscillation phenomenon is mainly affected by natural convection at the upper part of annulus. Although the fin positions cannot increase heat transfer rate significantly in the case of four fins, the self-oscillated solutions can be suppressed by altering fins position.
Highlights
Natural convection heat transfer in annulus has been the topic of many investigations until recently, since it has many industrial applications including solar heating, electronic components, and reactor design
The effect of fin position on heat transfer rate is negligible in the case of four fins, but the oscillated phenomenon can be partially suppressed by altering fin positions
The effect of fin numbers and position on non-linear characteristics was investigated in detail
Summary
Natural convection heat transfer in annulus has been the topic of many investigations until recently, since it has many industrial applications including solar heating, electronic components, and reactor design. Numerical investigations of the natural convection heat transfer in annulus with internal fins were studied by many researchers
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