Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

Abstract

The present numerical study reports the combined effect of natural convection and radiation heat from a vertical cylinder with annular fins. The study involves simulation for laminar as well as turbulent regimes. For the present study, Rayleigh's number is varied in the range 108−1012, emissivity in the range 0.2−0.8, and the fin spacing ratio (s/d) in the range 0.1−10. The radiation heat transfer has been found to share a considerable amount in the total heat transfer of the system for the laminar regime, but in the turbulent regime, its effect is minimal and can be neglected. When the fin spacing ratio is reduced, the total heat transfer increases for both the turbulent and laminar flow conditions. But the radiation heat increases with a reduction in fin spacing ratio for laminar and in case of turbulent flow radiation heat rate reduces with a reduction in s/d ratio. For the range of Rayleigh numbers considered in the present study, the Nusselt number increases with the increment of the fin spacing ratio. Thus, it can be concluded that there is a remarkable enhancement in the heat transfer rate in laminar cases with the fins. For turbulent cases, the fin efficiency lies between 40% and 50%.

Machine learning-based prediction of heat transfer performance in annular fins with functionally graded materials

“…The effectiveness of the rows lies in their ability to increase the available surface for heat exchange with the adjacent refrigerant, which increases the rate of heat transfer. Therefore, fins are widely used as cooling components in various devices and systems, including internal combustion engines, compressors, heat exchangers, transformers, nuclear rods, space batteries, and electronic equipment 2 . These applications rely on fins to efficiently remove heat and prevent negative effects associated with excessive temperatures.…”