Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes
| dc.contributor.author | Promvonge, Pongjet | |
| dc.date.accessioned | 2026-08-06T10:12:27Z | |
| dc.date.available | 2026-08-06T10:12:27Z | |
| dc.date.issued | 2015-12-05 | |
| dc.description.abstract | An investigation on heat transfer augmentation in a square duct with insertion of combined 30°V-fins and quadruple counter-twisted tapes is conducted experimentally. Air as the working fluid enters the test duct having a uniform wall heat-flux condition with Reynolds number ranging from 4000 to 30,000 in the present work. The combined vortex generators (called "V-finned counter-twisted tape") are obtained by incorporating V-fins into the edges of quadruple twisted-tapes having a similar twist ratio of 4. The effect of pertinent V-fin parameters such as four relative fin height, (R<inf>B</inf> = e/w = 0.16, 0.21, 0.32 and 0.42) and relative fin pitch, (R<inf>P</inf> = P/w = 4, 8, 12 and 16) at a single fin attack angle, α = 30°on thermal characteristics is examined. The experimental results reveal that the heat transfer and pressure drop in the form of respective Nusselt number and friction factor from the V-finned counter-twisted tape tend to increase with the rise of R<inf>B</inf> but show the reversing trend with increasing R<inf>P</inf>. The thermal performance of the V-finned counter-twisted tape is considerably higher than that of the quadruple twisted tapes alone. The V-finned counter-twisted tape with R<inf>B</inf> = 0.42 and R<inf>P</inf> = 4 yields the maximum Nusselt number and friction factor but the one with R<inf>B</inf> = 0.21 and R<inf>P</inf> = 4 provides the highest thermal performance of about 1.75 at lower Reynolds number. | |
| dc.identifier.citation | Applied Thermal Engineering, 91, 298-307, 2015 | |
| dc.identifier.doi | 10.1016/j.applthermaleng.2015.08.047 | |
| dc.identifier.issn | 13594311 | |
| dc.identifier.other | 2-s2.0-84940646778 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/6487 | |
| dc.source | Applied Thermal Engineering | |
| dc.subject | Fin | |
| dc.subject | Friction factor | |
| dc.subject | Heat transfer | |
| dc.subject | Square-duct heat exchanger | |
| dc.subject | Twisted-tape | |
| dc.title | Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes | |
| dc.type | Article |