Heat transfer characterization in a tubular heat exchanger with V-shaped rings
| dc.contributor.author | Chingtuaythong, Witoon | |
| dc.contributor.author | Promvonge, Pongjet | |
| dc.contributor.author | Thianpong, Chinaruk | |
| dc.contributor.author | Pimsarn, Monsak | |
| dc.date.accessioned | 2026-08-06T10:15:52Z | |
| dc.date.available | 2026-08-06T10:15:52Z | |
| dc.date.issued | 2017-01-05 | |
| dc.description.abstract | This article presents the influence of V-shaped rings (or V-ring) placed in a uniform heat-fluxed tube on heat transfer and flow resistance characteristics. In the current experiment, the V-ring elements with attack angle of 30° are inserted into the tube with four relative ring-pitches (R<inf>P</inf> = P/D = 0.5, 1.0, 1.5 and 2.0) and three ring blockage ratios (R<inf>B</inf> = e/D = 0.1, 0.15 and 0.2). Air as the test fluid flows through the tube for Reynolds number of about 5000–25,000. The experimental results reveal that the V-ring can considerably enhance the heat transfer rate up to 5.8 times above the plain tube whereas the friction factor is up to 82 times. The increase in R<inf>B</inf> leads to higher heat transfer and friction loss while the increment in R<inf>P</inf> provides the reversing trend. The thermal enhancement factor of the V-ring is in the range of 1.36–1.63 where its maximum regarded as the optimum point is at R<inf>B</inf> = 0.1 and R<inf>P</inf> = 1.0. In comparison with other vortex-flow devices, the V-ring yields much higher thermal performance than the published inclined rings, wire-coils and twisted tapes. Nusselt number and friction factor correlations for the V-ring are also determined. | |
| dc.identifier.citation | Applied Thermal Engineering, 110, 1164-1171, 2017 | |
| dc.identifier.doi | 10.1016/j.applthermaleng.2016.09.020 | |
| dc.identifier.issn | 13594311 | |
| dc.identifier.other | 2-s2.0-84987892070 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/7436 | |
| dc.source | Applied Thermal Engineering | |
| dc.subject | Friction factor | |
| dc.subject | Heat transfer | |
| dc.subject | Thermal performance | |
| dc.subject | V-ring | |
| dc.subject | Vortex generator | |
| dc.title | Heat transfer characterization in a tubular heat exchanger with V-shaped rings | |
| dc.type | Article |