Thermo-Hydraulic Performance of Metallic Twisted-Tape Inserts in a Double-Pipe Heat ExchangerPages 371-376
S.T. Patil,
Omkar Phalle,
Prashant B. Dehankar Abstract:
Heat transfer augmentation procedures, such as heat transfer enhancement and intensification, are commonly used in heat exchanger systems to improve thermal performance by decreasing thermal resistance and increasing convective heat transfer rates. Swirl-flow devices, such as coiled tubes, twisted-tape inserts, and other geometric alterations, are commonly used to create secondary flow and improve heat transfer efficiency. This study aimed to evaluate the performance of a double-pipe heat exchanger by comparing its performance with and without twisted-tape inserts. The setup consisted of a copper inner tube measuring 13 mm in inner diameter and 15 mm in outer diameter, together with an outer pipe measuring 23 mm in inner diameter and 25 mm in outer diameter. Mild steel twisted tapes with dimensions of 2 mm thickness, 1.2 cm width, and twist ratios of 4.3 and 7.2 were used. The findings indicated that the heat transfer coefficient was 276.40 W/m²°C when twisted-tape inserts were used, while it was 192.99 W/m²°C without inserts. The experimental results showed that the use of twisted-tape inserts improved the heat transfer coefficient by approximately 43%, demonstrating their effectiveness in enhancing heat transfer performance in the double-pipe heat exchanger.
Keywords: Metallic twisted-tape insert, Thermo-hydraulic performance, Heat transfer enhancement, Double-pipe heat exchanger, Swirl flow, Friction factor, NTU Method
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