Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers
This experimental study investigates the effect of peak-to-peak amplitude (PTPA) at the base of a crimped spiral fin (CSF) on the air-side performance of a crimped spiral fin-and-tube heat exchanger (CSFTHX) within a 3,000 to 14,000 Reynolds number range. Both plain spiral fins (PSFs) and CSFs are e...
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Elsevier
2025-06-01
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| Series: | Applications in Engineering Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S266649682500024X |
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| author | Thawatchai Keawkamrop Somchai Wongwises |
| author_facet | Thawatchai Keawkamrop Somchai Wongwises |
| author_sort | Thawatchai Keawkamrop |
| collection | DOAJ |
| description | This experimental study investigates the effect of peak-to-peak amplitude (PTPA) at the base of a crimped spiral fin (CSF) on the air-side performance of a crimped spiral fin-and-tube heat exchanger (CSFTHX) within a 3,000 to 14,000 Reynolds number range. Both plain spiral fins (PSFs) and CSFs are examined. The PTPA is the main geometric parameter of interest in this study. We investigated CSFTHXs with a 19.05 mm outer tube diameter, a fin density of 5 fins per inch (equivalent to a fin pitch of 5.08 mm). The selected peak-to-peak amplitude (PTPA) values—2.5 mm (low), 3.5 mm (medium), and 5.08 mm (high)—cover a representative range commonly used in industrial applications. The results indicate that variations in the PTPA have an insignificant effect on the Colburn factor, suggesting minimal influence on heat transfer performance. However, the PTPA has a significant effect on the friction factor, with higher PTPA values resulting in increased pressure drops. The fin factor, defined as the ratio between the percentage increase in the convective heat transfer coefficient and the corresponding percentage increase in pressure drop, is used for the investigation. For the air frontal velocities above 2 m/s, the fin factor of the CSF with a PTPA of 2.50 mm is higher than those with PTPA values of 3.50 mm and 5.08 mm. This indicates better overall performance in terms of a heat transfer-to-pressure drop trade-off at lower amplitudes. |
| format | Article |
| id | doaj-art-d8feec4baedf4175993f51a22042f2b2 |
| institution | OA Journals |
| issn | 2666-4968 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
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| series | Applications in Engineering Science |
| spelling | doaj-art-d8feec4baedf4175993f51a22042f2b22025-08-20T02:02:19ZengElsevierApplications in Engineering Science2666-49682025-06-012210022610.1016/j.apples.2025.100226Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangersThawatchai Keawkamrop0Somchai Wongwises1Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi (KMUTT), Bangmod, Bangkok 10140, ThailandCorresponding author.; Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi (KMUTT), Bangmod, Bangkok 10140, ThailandThis experimental study investigates the effect of peak-to-peak amplitude (PTPA) at the base of a crimped spiral fin (CSF) on the air-side performance of a crimped spiral fin-and-tube heat exchanger (CSFTHX) within a 3,000 to 14,000 Reynolds number range. Both plain spiral fins (PSFs) and CSFs are examined. The PTPA is the main geometric parameter of interest in this study. We investigated CSFTHXs with a 19.05 mm outer tube diameter, a fin density of 5 fins per inch (equivalent to a fin pitch of 5.08 mm). The selected peak-to-peak amplitude (PTPA) values—2.5 mm (low), 3.5 mm (medium), and 5.08 mm (high)—cover a representative range commonly used in industrial applications. The results indicate that variations in the PTPA have an insignificant effect on the Colburn factor, suggesting minimal influence on heat transfer performance. However, the PTPA has a significant effect on the friction factor, with higher PTPA values resulting in increased pressure drops. The fin factor, defined as the ratio between the percentage increase in the convective heat transfer coefficient and the corresponding percentage increase in pressure drop, is used for the investigation. For the air frontal velocities above 2 m/s, the fin factor of the CSF with a PTPA of 2.50 mm is higher than those with PTPA values of 3.50 mm and 5.08 mm. This indicates better overall performance in terms of a heat transfer-to-pressure drop trade-off at lower amplitudes.http://www.sciencedirect.com/science/article/pii/S266649682500024XCrimped spiral finSpiral finExtended surfaceHeat transferHeat exchanger |
| spellingShingle | Thawatchai Keawkamrop Somchai Wongwises Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers Applications in Engineering Science Crimped spiral fin Spiral fin Extended surface Heat transfer Heat exchanger |
| title | Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers |
| title_full | Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers |
| title_fullStr | Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers |
| title_full_unstemmed | Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers |
| title_short | Effect of peak-to-peak amplitude at the base of crimped spiral fins on the air-side performance of crimped spiral fin-and-tube heat exchangers |
| title_sort | effect of peak to peak amplitude at the base of crimped spiral fins on the air side performance of crimped spiral fin and tube heat exchangers |
| topic | Crimped spiral fin Spiral fin Extended surface Heat transfer Heat exchanger |
| url | http://www.sciencedirect.com/science/article/pii/S266649682500024X |
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