Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings
This research examines the effects of oval inclined twisted rings (I-TRs) on thermal performance characteristics. Heat transfer enhancement, friction factor, and thermal enhancement factor tests were conducted under uniform wall heat flux with Reynolds numbers (Re) varying from 6000 to 20,000. A sys...
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Elsevier
2025-03-01
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| Series: | Engineering Science and Technology, an International Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2215098625000369 |
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| author | P. Samruaisin V. Chuwattanakul P. Thapmanee M. Kumar P. Naphon N. Maruyama M. Hirota S. Eiamsa-ard |
| author_facet | P. Samruaisin V. Chuwattanakul P. Thapmanee M. Kumar P. Naphon N. Maruyama M. Hirota S. Eiamsa-ard |
| author_sort | P. Samruaisin |
| collection | DOAJ |
| description | This research examines the effects of oval inclined twisted rings (I-TRs) on thermal performance characteristics. Heat transfer enhancement, friction factor, and thermal enhancement factor tests were conducted under uniform wall heat flux with Reynolds numbers (Re) varying from 6000 to 20,000. A systematic investigation was carried out to examine the influence of different pitch ratios (p/D) and oval-ring inclination angles (θ) on thermal enhancement factor (TEF). The experimental results reveal that the Nusselt number increases with decreasing pitch ratio (p/D) and inclination angle (θ) of the I-TRs. At p/D = 1.5, the Nusselt numbers are approximately 8.59 % to 18.78 % higher than those for I-TRs with p/D values of 2.0 and 2.5. At the smallest inclination angle, θ = 30°, the Nusselt numbers are approximately higher than those at θ = 45°, 60°, 75°, and 90° by around 1.56 %, 7.21 %, 13.74 %, and 27.14 %, respectively. At a p/D ratio of 1.5 and an inclination angle of θ = 30°, the resulting thermal enhancement factor (TEF) consistently exceeds unity across the entire Reynolds number (Re) range. In contrast, for other geometries and configurations, some TEF values fall below unity at higher Re. Within the studied range, the highest TEF of 1.12 is achieved at θ = 30°, p/D = 1.5, and Re = 6,000. The key finding suggests that the performance of the thermal system is highly dependent on both the configuration and operational conditions. |
| format | Article |
| id | doaj-art-82244d58c0444ee1916c36e8382739f6 |
| institution | Kabale University |
| issn | 2215-0986 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Engineering Science and Technology, an International Journal |
| spelling | doaj-art-82244d58c0444ee1916c36e8382739f62025-01-31T05:11:22ZengElsevierEngineering Science and Technology, an International Journal2215-09862025-03-0163101981Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted ringsP. Samruaisin0V. Chuwattanakul1P. Thapmanee2M. Kumar3P. Naphon4N. Maruyama5M. Hirota6S. Eiamsa-ard7School 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.School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok 10530 ThailandMechanical Engineering Department, DIT University, Dehradun Uttarakhand, IndiaDepartment of Mechanical Engineering, Faculty of Engineering, Srinakharinwirot University, ThailandEngineering 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 research examines the effects of oval inclined twisted rings (I-TRs) on thermal performance characteristics. Heat transfer enhancement, friction factor, and thermal enhancement factor tests were conducted under uniform wall heat flux with Reynolds numbers (Re) varying from 6000 to 20,000. A systematic investigation was carried out to examine the influence of different pitch ratios (p/D) and oval-ring inclination angles (θ) on thermal enhancement factor (TEF). The experimental results reveal that the Nusselt number increases with decreasing pitch ratio (p/D) and inclination angle (θ) of the I-TRs. At p/D = 1.5, the Nusselt numbers are approximately 8.59 % to 18.78 % higher than those for I-TRs with p/D values of 2.0 and 2.5. At the smallest inclination angle, θ = 30°, the Nusselt numbers are approximately higher than those at θ = 45°, 60°, 75°, and 90° by around 1.56 %, 7.21 %, 13.74 %, and 27.14 %, respectively. At a p/D ratio of 1.5 and an inclination angle of θ = 30°, the resulting thermal enhancement factor (TEF) consistently exceeds unity across the entire Reynolds number (Re) range. In contrast, for other geometries and configurations, some TEF values fall below unity at higher Re. Within the studied range, the highest TEF of 1.12 is achieved at θ = 30°, p/D = 1.5, and Re = 6,000. The key finding suggests that the performance of the thermal system is highly dependent on both the configuration and operational conditions.http://www.sciencedirect.com/science/article/pii/S2215098625000369Heat transfer enhancementMulti-vortex flowOval inclined twisted-ringsThermal performance |
| spellingShingle | P. Samruaisin V. Chuwattanakul P. Thapmanee M. Kumar P. Naphon N. Maruyama M. Hirota S. Eiamsa-ard Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings Engineering Science and Technology, an International Journal Heat transfer enhancement Multi-vortex flow Oval inclined twisted-rings Thermal performance |
| title | Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| title_full | Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| title_fullStr | Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| title_full_unstemmed | Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| title_short | Thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| title_sort | thermohydraulic performance evaluation of a heat exchanger mounted with oval inclined twisted rings |
| topic | Heat transfer enhancement Multi-vortex flow Oval inclined twisted-rings Thermal performance |
| url | http://www.sciencedirect.com/science/article/pii/S2215098625000369 |
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