Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape
This study examines the influences of U-cut twisted tapes (U-TTs) on thermal-hydraulic behaviors in a circular tube with uniform heat flux. The geometric parameters studied include six U-cut ratios (s/t = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) and two twist ratios (y/w = 3.5 and 4.0). Experimental result...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X2500098X |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1823859426499493888 |
|---|---|
| author | K. Wongcharee V. Chuwattanakul S. Chamoli N. Maruyama M. Hirota S. Eiamsa-ard |
| author_facet | K. Wongcharee V. Chuwattanakul S. Chamoli N. Maruyama M. Hirota S. Eiamsa-ard |
| author_sort | K. Wongcharee |
| collection | DOAJ |
| description | This study examines the influences of U-cut twisted tapes (U-TTs) on thermal-hydraulic behaviors in a circular tube with uniform heat flux. The geometric parameters studied include six U-cut ratios (s/t = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) and two twist ratios (y/w = 3.5 and 4.0). Experimental results revealed that their U-cut ratios highly influenced heat transfer enhancement. U-TTs with U-cut ratios (s/t) of 0.5, 1.0, 1.5, and 2.0 achieved higher Nusselt numbers than conventional twisted tapes (TTs). In contrast, U-TTs with larger U-cut ratios (s/t = 2.5 and 3.0) showed reduced Nusselt numbers. However, friction losses with all U-TTs were consistently higher than those with TTs. Due to their excellent heat transfer enhancement, U-TTs with s/t ratios of 0.5 and 1.0 exhibited significantly higher thermal performance factors (TPF) than conventional TTs. The highest TPF, 1.28, was achieved by U-TTs with an s/t ratio of 0.5 and a y/w of 3.5 at a Reynolds number of 6000. |
| format | Article |
| id | doaj-art-c3212b83998745a4be664c78cadf33c7 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-c3212b83998745a4be664c78cadf33c72025-02-11T04:34:53ZengElsevierCase Studies in Thermal Engineering2214-157X2025-03-0167105838Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tapeK. Wongcharee0V. Chuwattanakul1S. Chamoli2N. Maruyama3M. Hirota4S. Eiamsa-ard5School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, ThailandSchool of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Corresponding author.Department of Mechanical Engineering, Govind Ballabh Pant Institute of Engineering & Technology, Pauri Garhwal, Uttarakhand, 246194, IndiaEngineering Innovation Unit, Graduate School of Regional Innovation Studies, Mie University, Tsu, Mie, 514-8507, Japan; Department of Mechanical Engineering, Faculty of Engineering, Mie University, Tsu, Mie, 514-8507, JapanDepartment of Mechanical Engineering, Faculty of Engineering, Aichi Institute of Technology, Toyota, Aichi, 470-0392, JapanSchool of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, ThailandThis study examines the influences of U-cut twisted tapes (U-TTs) on thermal-hydraulic behaviors in a circular tube with uniform heat flux. The geometric parameters studied include six U-cut ratios (s/t = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) and two twist ratios (y/w = 3.5 and 4.0). Experimental results revealed that their U-cut ratios highly influenced heat transfer enhancement. U-TTs with U-cut ratios (s/t) of 0.5, 1.0, 1.5, and 2.0 achieved higher Nusselt numbers than conventional twisted tapes (TTs). In contrast, U-TTs with larger U-cut ratios (s/t = 2.5 and 3.0) showed reduced Nusselt numbers. However, friction losses with all U-TTs were consistently higher than those with TTs. Due to their excellent heat transfer enhancement, U-TTs with s/t ratios of 0.5 and 1.0 exhibited significantly higher thermal performance factors (TPF) than conventional TTs. The highest TPF, 1.28, was achieved by U-TTs with an s/t ratio of 0.5 and a y/w of 3.5 at a Reynolds number of 6000.http://www.sciencedirect.com/science/article/pii/S2214157X2500098XHeat transfer performanceSwirling flowThermal performanceTwisted tapeTurbulenceU-cut twisted tape |
| spellingShingle | K. Wongcharee V. Chuwattanakul S. Chamoli N. Maruyama M. Hirota S. Eiamsa-ard Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape Case Studies in Thermal Engineering Heat transfer performance Swirling flow Thermal performance Twisted tape Turbulence U-cut twisted tape |
| title | Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape |
| title_full | Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape |
| title_fullStr | Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape |
| title_full_unstemmed | Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape |
| title_short | Investigation of turbulent thermal-hydraulic behaviors of a heat exchanger tube with U-cut twisted-tape |
| title_sort | investigation of turbulent thermal hydraulic behaviors of a heat exchanger tube with u cut twisted tape |
| topic | Heat transfer performance Swirling flow Thermal performance Twisted tape Turbulence U-cut twisted tape |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X2500098X |
| work_keys_str_mv | AT kwongcharee investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape AT vchuwattanakul investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape AT schamoli investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape AT nmaruyama investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape AT mhirota investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape AT seiamsaard investigationofturbulentthermalhydraulicbehaviorsofaheatexchangertubewithucuttwistedtape |