Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths
Multiport minichannel thermosyphons with hydraulic diameters below 1.2 mm often encounter severe flow instabilities and oscillations in vapor and condensate movement, which hinder effective phase change processes. These instabilities can cause partial and localized dry-out, resulting in higher opera...
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Elsevier
2025-09-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25007555 |
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| author | Jaya Antony Perinba Selvin Raj Lazarus Godson Asirvatham Appadurai Anitha Angeline Bairi Levi Rakshith Jefferson Raja Bose Stephen Manova Vivek Vengatoor Mana Mostafa Safdari Shadloo Somchai Wongwises |
| author_facet | Jaya Antony Perinba Selvin Raj Lazarus Godson Asirvatham Appadurai Anitha Angeline Bairi Levi Rakshith Jefferson Raja Bose Stephen Manova Vivek Vengatoor Mana Mostafa Safdari Shadloo Somchai Wongwises |
| author_sort | Jaya Antony Perinba Selvin Raj |
| collection | DOAJ |
| description | Multiport minichannel thermosyphons with hydraulic diameters below 1.2 mm often encounter severe flow instabilities and oscillations in vapor and condensate movement, which hinder effective phase change processes. These instabilities can cause partial and localized dry-out, resulting in higher operating temperatures and reduced thermal performance. To overcome these limitations, a novel multiport minichannel thermosyphon loop (MPMCTSL) is proposed. This design integrates a compensation chamber (CC) to ensure uniform fluid distribution across all channels and suppress instabilities near the evaporator. Additionally, the loop features separate flow paths for vapor and liquid to mitigate entrainment issues. The study experimentally investigates the thermal performance of MPMCTSL using acetone as the working fluid, considering fill ratios of 40 %, 50 %, and 60 %, inclination angles of 0°, 30°, 60°, and 90°, and varying heat loads from 10 to 80 W. Results demonstrate that 5 mm CC length delivers optimal performance by stabilizing condensate flow and ensuring continuous fluid replenishment to the evaporator. This results in minimum thermal resistance of 0.34 K/W and a peak vapor velocity of 4.36 m/s at 80 W heat load. Furthermore, the observed flow regime transition from churn to annular with increasing heat input confirms the improved stability and effectiveness of the MPMCTSL design. |
| format | Article |
| id | doaj-art-a7f4b057e99e4f9f82b96ea381c27566 |
| institution | DOAJ |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-a7f4b057e99e4f9f82b96ea381c275662025-08-20T03:21:51ZengElsevierCase Studies in Thermal Engineering2214-157X2025-09-017310649510.1016/j.csite.2025.106495Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid pathsJaya Antony Perinba Selvin Raj0Lazarus Godson Asirvatham1Appadurai Anitha Angeline2Bairi Levi Rakshith3Jefferson Raja Bose4Stephen Manova5Vivek Vengatoor Mana6Mostafa Safdari Shadloo7Somchai Wongwises8Department of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Centre for Research in Material Science and Thermal Management (CRMS &TM), Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, IndiaDepartment of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Centre for Research in Material Science and Thermal Management (CRMS &TM), Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Corresponding author. Department of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India.Department of Robotics Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, IndiaDepartment of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Centre for Research in Material Science and Thermal Management (CRMS &TM), Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, IndiaDepartment of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Centre for Research in Material Science and Thermal Management (CRMS &TM), Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, IndiaDepartment of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi (KMUTT), Bangmod, Bangkok, 10140, ThailandDepartment of Mechanical Engineering, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India; Department of Mechanical Engineering, NSS College of Engineering, Palakkad, 6780008, Kerala, IndiaINSA Rouen Normandie, Univ. Rouen Normandie, CNRS, Normandie University, CORIA UMR 6614, F-76000 Rouen, FranceDepartment of Mechanical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi (KMUTT), Bangmod, Bangkok, 10140, Thailand; Corresponding author.Multiport minichannel thermosyphons with hydraulic diameters below 1.2 mm often encounter severe flow instabilities and oscillations in vapor and condensate movement, which hinder effective phase change processes. These instabilities can cause partial and localized dry-out, resulting in higher operating temperatures and reduced thermal performance. To overcome these limitations, a novel multiport minichannel thermosyphon loop (MPMCTSL) is proposed. This design integrates a compensation chamber (CC) to ensure uniform fluid distribution across all channels and suppress instabilities near the evaporator. Additionally, the loop features separate flow paths for vapor and liquid to mitigate entrainment issues. The study experimentally investigates the thermal performance of MPMCTSL using acetone as the working fluid, considering fill ratios of 40 %, 50 %, and 60 %, inclination angles of 0°, 30°, 60°, and 90°, and varying heat loads from 10 to 80 W. Results demonstrate that 5 mm CC length delivers optimal performance by stabilizing condensate flow and ensuring continuous fluid replenishment to the evaporator. This results in minimum thermal resistance of 0.34 K/W and a peak vapor velocity of 4.36 m/s at 80 W heat load. Furthermore, the observed flow regime transition from churn to annular with increasing heat input confirms the improved stability and effectiveness of the MPMCTSL design.http://www.sciencedirect.com/science/article/pii/S2214157X25007555Multiport mini-channelLoop thermosyphonEntrainmentHeat transferPower electronic coolingCompensation chamber design |
| spellingShingle | Jaya Antony Perinba Selvin Raj Lazarus Godson Asirvatham Appadurai Anitha Angeline Bairi Levi Rakshith Jefferson Raja Bose Stephen Manova Vivek Vengatoor Mana Mostafa Safdari Shadloo Somchai Wongwises Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths Case Studies in Thermal Engineering Multiport mini-channel Loop thermosyphon Entrainment Heat transfer Power electronic cooling Compensation chamber design |
| title | Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths |
| title_full | Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths |
| title_fullStr | Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths |
| title_full_unstemmed | Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths |
| title_short | Mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor-liquid paths |
| title_sort | mitigation of flow instabilities in multiport minichannel thermosyphon through a modified loop design with separate vapor liquid paths |
| topic | Multiport mini-channel Loop thermosyphon Entrainment Heat transfer Power electronic cooling Compensation chamber design |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25007555 |
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