Heat transfer enhancement in a tube using delta-winglet twisted tape inserts
| dc.contributor.author | Eiamsa-ard, S. | |
| dc.contributor.author | Wongcharee, K. | |
| dc.contributor.author | Eiamsa-ard, P. | |
| dc.contributor.author | Thianpong, C. | |
| dc.date.accessioned | 2026-08-06T10:00:02Z | |
| dc.date.available | 2026-08-06T10:00:02Z | |
| dc.date.issued | 2010-03-01 | |
| dc.description.abstract | Heat transfer, flow friction and thermal performance factor characteristics in a tube fitted with delta-winglet twisted tape, using water as working fluid are investigated experimentally. Influences of the oblique delta-winglet twisted tape (O-DWT) and straight delta-winglet twisted tape (S-DWT) arrangements are also described. The experiments are conducted using the tapes with three twist ratios (y/w = 3, 4 and 5) and three depth of wing cut ratios (DR = d/w = 0.11, 0.21 and 0.32) over a Reynolds number range of 3000-27,000 in a uniform wall heat flux tube. The obtained results show that mean Nusselt number and mean friction factor in the tube with the delta-winglet twisted tape increase with decreasing twisted ratio (y/w) and increasing depth of wing cut ratio (DR). It is also observed that the O-DWT is more effective turbulator giving higher heat transfer coefficient than the S-DWT. Over the range considered, Nusselt number, friction factor and thermal performance factor in a tube with the O-DWT are, respectively, 1.04-1.64, 1.09-1.95, and 1.05-1.13 times of those in the tube with typical twisted tape (TT). Empirical correlations for predicting Nusselt number and friction factor have been employed. The predicted data are within ±10% for Nusselt number and ±10% for friction factor. © 2009 Elsevier Ltd. All rights reserved. | |
| dc.identifier.citation | Applied Thermal Engineering, 30(4), 310-318, 2010 | |
| dc.identifier.doi | 10.1016/j.applthermaleng.2009.09.006 | |
| dc.identifier.issn | 13594311 | |
| dc.identifier.other | 2-s2.0-72149087436 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/2990 | |
| dc.source | Applied Thermal Engineering | |
| dc.subject | Delta-winglet twisted tape | |
| dc.subject | Friction factor | |
| dc.subject | Heat transfer enhancement | |
| dc.subject | Swirl flow | |
| dc.title | Heat transfer enhancement in a tube using delta-winglet twisted tape inserts | |
| dc.type | Article |