환형핀과 원형판이 삽입된 원형덕트에서의 열전달 증대

초록

The characteristics of heat transfer and pressure drop for fully developed turbulent flow in a tube with circumferential fins and circular disks are experimentally studied. The various spacing and sizes of circumferential fins and circular disks are selected as the design parameters, and the effects of these parameters on heat transfer enhancement and pressure drop are investigated. In order to quantify the effect of heat transfer enhancement and the increase of pressure drop due to the fins and disks in a tube, the Nusselt numbers and the friction factors for the various configurations and the operating conditions are compared to those for a corresponding smooth tube. The results show that the heat transfer rate is significantly enhanced with increasing the height of circumferential fins and decreasing the pitch of the circumferential fins. On the other hand, the influence of the disk radius and the spacing of the fin and disk is not significant