Abstract
This article discusses the possibility of further reducing the mass of the heat exchanger with stainless steel star-shaped fins while achieving good heat transfer performance. For this purpose, we perforated the fins with holes Ø2, Ø3, and Ø4 mm. Applying computational fluid dynamics (CFD) numerical analysis, we determined the influence of each perforation on the characteristics of the flow field in the liquid–gas type of heat exchanger and the heat transfer for the range of Re numbers from 2300 to 16,000. With a reduction in the mass of the fins to 17.65% (by Ø4 mm), perforated fins had greater heat transfer from 5.5% to 11.3% than fins without perforation. A comparison of perforated star-shaped fins with annular fins was also performed. Perforated fins had 51.8% less mass than annular fins, with an increase in heat transfer up to 26.5% in terms of Nusselt number.
Highlights
Finned surfaces are commonly used for efficient heat exchange between liquids and gases
Numerical analysis, we determined the influence of each perforation on the characteristics of the flow field in the liquid–gas type of heat exchanger and the heat transfer for the range of Reynolds number (Re) numbers from 2300 to 16,000
The results were compared with the equivalent case heat transfer coefficient of star-shaped fins was higher by 10% to 15% in the range of Re numbers of solid annular fins
Summary
Finned surfaces are commonly used for efficient heat exchange between liquids and gases. The authors constructed tubular heat exchangers with starOne of the proposals to reduce the heat exchangers mass with enhancement in the heat transfer is shaped fins and analyzed them by CFD simulation. The authors constructed tubular heat exchangers with star-shaped case of solid annular fins. The results were compared with the equivalent case heat transfer coefficient of star-shaped fins was higher by 10% to 15% in the range of Re numbers of solid annular fins. One of the ideas of further reducing the mass of this type of heat exchangers is transfer coefficient of star-shaped fins was higher by 10% to 15% in the range of Re numbers from fins perforation, which is analyzed in this article. One of the ideas of further reducing the mass of this type of heat exchangers is fins perforation, which is analyzed in this article
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