Abstract
In the present work, three-dimensional numerical analysis was carried out for thermo-fluid analysis of annular fin-and-tube heat exchangers (AFTHE) with circular fins and elliptical fins having varying Reynolds number (Re) changed from 4000 to 9000. The effects of the angle of attack (α) and the ratio of long diameter to short diameter (LDR) for elliptical fins on heat transfer characteristics and flow structures were studied and analyzed in inline arrangement tubes. The thermo-hydraulic performance criteria which include Nusselt number (Nu), friction factor (f), and London area goodness factor (JF) were also compared. The results showed that the heat transfer performance of the AFTHE with elliptical fins was better than that of AFTHE with circular fins, except for elliptical fins with an α of 90°. The JF for AFTHE with elliptical fins, when the value of α was 0°, was optimal, which improved by 42.08 % based on the AFTHE with circular fins. When α was 0°, the JF of the AFTHE with elliptical fins was proportional to the LDR, where the LDR of 1.5 was improved by 43.52 % from the AFTHE with circular fins. And the results were well in line with the entropy generation.
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