Intensification of thermo-hydraulic performance in heat exchanger tube inserted with multiple twisted-tapes
| dc.contributor.author | Piriyarungrod, N. | |
| dc.contributor.author | Kumar, Manoj | |
| dc.contributor.author | Thianpong, C. | |
| dc.contributor.author | Pimsarn, M. | |
| dc.contributor.author | Chuwattanakul, V. | |
| dc.contributor.author | Eiamsa-ard, S. | |
| dc.date.accessioned | 2026-08-06T10:19:52Z | |
| dc.date.available | 2026-08-06T10:19:52Z | |
| dc.date.issued | 2018-05-25 | |
| dc.description.abstract | The present work presents the thermo-hydraulic characteristics in the heat exchanger tube inserted with multiple-twisted tapes (M-TT). Multiple-twisted tapes consisted of a larger twisted tape and small twisted tapes which were placed along with the larger twisted tape. The study encompassed 6 different twist ratios of the small twisted tapes (y/w = 2.5, 5, 10, 15, 20 and 25) and 5 different numbers of the small twisted tapes (N = 2, 3, 4, 5 and 6). Experiments were conducted under uniform wall heat flux condition by using air as the testing fluid for Reynolds numbers from 6000 to 20,000. A large single twisted tape in a tight-fit form (T-TT) and that in a loose-fit form (L-TT) were tested as the reference cases for comparison. The experimental results found that the use of multiple-twisted tapes (M-TT) with N = 3, 4, 5 and 6 leads to the considerable increases in heat transfer enhancement and friction factor as compared to those of single twisted tape. For multiple twisted tapes (M-TT), Nusselt number (Nu), friction factor (f) and thermo-hydraulic performance factor (η) increase with increasing number (N) and decreasing twist ratio (y/w) of small twisted tapes. The maximum thermo-hydraulic performance factor of 1.2 is obtained by the use of M-TT with N = 6 and y/w = 2.5. In addition, the numerical work on flow and thermal behaviors was also performed for a better understanding of heat transfer mechanisms. | |
| dc.identifier.citation | Applied Thermal Engineering, 136, 516-530, 2018 | |
| dc.identifier.doi | 10.1016/j.applthermaleng.2018.02.097 | |
| dc.identifier.issn | 13594311 | |
| dc.identifier.other | 2-s2.0-85043993171 | |
| dc.identifier.uri | https://dspace.kmitl.ac.th/handle/123456789/8560 | |
| dc.source | Applied Thermal Engineering | |
| dc.subject | Heat transfer | |
| dc.subject | Multiple swirl flows | |
| dc.subject | Multiple-twisted tapes | |
| dc.subject | Thermo-hydraulic enhancement | |
| dc.title | Intensification of thermo-hydraulic performance in heat exchanger tube inserted with multiple twisted-tapes | |
| dc.type | Article |