CFD study of Heat Transfer Characteristics for Annular Serrated Finned-Tube Heat Exchanger
Author: Ahmed Jabbar Mansour , Zena Khalefa Kadhim and Kamil Abdul Hussein
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Abstract
Annular serrated finned-tubes are well established in many thermal systems. This paper presents the results of numerical calculations which carried out for the performance improvement of these devices. This study deals the main investigations conducted with different five mass flow rate between (0.012, 0.14,0.016,0.018 and 0.02) kg/sec for the cooled water and selected one mass flow rate for the hot water with (Re, 250), as well as the effect of the number of fin segments of serrated fins (4, 8, 10, 12 and 14), and the effect of fin twisting of the outermost part of the fin on the performance of the serrated finned-tubes. The twisting angles considered are between β (0o and 25o) where a comparison between performances of finned tubes with and without fin serration, the computational results showed that the Nusselt number with serrated insert is augmented by (61.9, 53. 41, 27.8, and 12.6%) for (14, 12,10,8 and 4) serrated fins respectively comparing with smooth tube. The maximum value of Nusselt number and maximal skin friction coefficient was found in 14 serrated fins.
Keywords- CFD, heat transfer, annular, heat exchange.