Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes
| dc.contributor.author | Tamna, Sombat | |
| dc.contributor.author | Kaewkohkiat, Yingyong | |
| dc.contributor.author | Skullong, Sompol | |
| dc.contributor.author | Promvonge, Pongjet | |
| dc.date.accessioned | 2026-08-06T10:13:35Z | |
| dc.date.available | 2026-08-06T10:13:35Z | |
| dc.date.issued | 2016-03-01 | |
| dc.description.abstract | An experimental work on heat transfer enhancement in a round tube by insertion of double twisted tapes in common with 30° V-shaped ribs has been conducted. Air as the test fluid flowed through the test tube having a constant wall heat-flux with Reynolds number (Re) from 5300 to 24,000. The combined vortex generators (called "V-ribbed twisted tape") were obtained by incorporating V-shaped ribs into the edges of double co-twisted tapes having a similar twist ratio of 4. The effect of pertinent V-rib parameters such as four relative rib heights, (called "blockage ratio", B<inf>R</inf>=b/D= 0.07, 0.09, 0.14 and 0.19) and a relative rib pitch, (P<inf>R</inf>=P/D=1.9) at an attack angle of rib, α=30° on thermal characteristics was investigated. The experimental results reveal that the heat transfer and pressure drop in terms of the respective Nusselt number and friction factor for the V-ribbed twisted tapes show the increasing trend with the rise of Re and B<inf>R</inf>. The V-ribbed twisted tape with B<inf>R</inf>=0.19 yields the highest heat transfer and friction factor. However, the maximum thermal enhancement factor is about 1.4 for the V-ribbed twisted tape at B<inf>R</inf>=0.09 but is around 1.09 for the twisted tape with no rib. | |
| dc.identifier.citation | Case Studies in Thermal Engineering, 7, 14-24, 2016 | |
| dc.identifier.doi | 10.1016/j.csite.2016.01.002 | |
| dc.identifier.issn | 2214157X | |
| dc.identifier.other | 2-s2.0-84955315292 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/6804 | |
| dc.source | Case Studies in Thermal Engineering | |
| dc.subject | Heat transfer | |
| dc.subject | Rib | |
| dc.subject | Thermal performance | |
| dc.subject | Twisted tape | |
| dc.subject | Vortex generator | |
| dc.title | Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes | |
| dc.type | Article |