Influence of notched baffles on aerothermal performance behaviors in a channel
The proper designs of modified heat transfer surfaces or turbulence enhancement inserts for heat transfer augmentation are extremely important for improving overall aerothermal performances relating to the energy-saving capabilities of thermal systems. A major challenge is to control friction loss a...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-07-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23003763 |
| _version_ | 1797808376556552192 |
|---|---|
| author | Arnut Phila Warin Keaitnukul Smith Eiamsa-ard Paisarn Naphon Naoki Maruyama Masafumi Hirota Varesa Chuwattanakul |
| author_facet | Arnut Phila Warin Keaitnukul Smith Eiamsa-ard Paisarn Naphon Naoki Maruyama Masafumi Hirota Varesa Chuwattanakul |
| author_sort | Arnut Phila |
| collection | DOAJ |
| description | The proper designs of modified heat transfer surfaces or turbulence enhancement inserts for heat transfer augmentation are extremely important for improving overall aerothermal performances relating to the energy-saving capabilities of thermal systems. A major challenge is to control friction loss as little as possible while maintaining reasonable heat transfer enhancement. Transverse baffles with rectangular notches or notched baffles (NBs) were applied for improving aerothermal performance in a channel with a constant aspect ratio of 3.75 while notch height-to-baffle height ratio (a/e) ranged from 0.125 to 0.5. Reynolds number ranged from 6000 to 24,000, in experiments. Heat transfer enhancement, pressure loss, and aerothermal performance in a rectangular channel with notched baffles were examined. Compared to the solid transverse baffle (SB, a/e = 0), the NBs with a/e = 0.125 increased the heat transfer rate while lessening the pressure loss, as shown by the experimental findings. Obviously, Nusselt number, friction factor and aerothermal performance increased as the a/e ratio decreased. The NBs with the smallest notch height-to-baffle height ratio (a/e = 0.125) exhibited the highest aerothermal performance of 1.17, which can be attributed to the efficient heat transfer enhancement by the strong multi-jet impingements and the moderate friction loss penalty resulting from the presence of notches (spaces) on the baffles. |
| first_indexed | 2024-03-13T06:36:37Z |
| format | Article |
| id | doaj.art-00a3047642d14072a77a505893ac9d03 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-03-13T06:36:37Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-00a3047642d14072a77a505893ac9d032023-06-09T04:28:01ZengElsevierCase Studies in Thermal Engineering2214-157X2023-07-0147103070Influence of notched baffles on aerothermal performance behaviors in a channelArnut Phila0Warin Keaitnukul1Smith Eiamsa-ard2Paisarn Naphon3Naoki Maruyama4Masafumi Hirota5Varesa Chuwattanakul6Department of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, ThailandDepartment of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, ThailandDepartment of Mechanical Engineering, School of Engineering and Industrial Technology, Mahanakorn University of Technology, Bangkok, 10530, Thailand; Division of System Engineering, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, JapanThermo-Fluid and Heat Transfer Enhancement Lab., Department 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, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand; Corresponding author.The proper designs of modified heat transfer surfaces or turbulence enhancement inserts for heat transfer augmentation are extremely important for improving overall aerothermal performances relating to the energy-saving capabilities of thermal systems. A major challenge is to control friction loss as little as possible while maintaining reasonable heat transfer enhancement. Transverse baffles with rectangular notches or notched baffles (NBs) were applied for improving aerothermal performance in a channel with a constant aspect ratio of 3.75 while notch height-to-baffle height ratio (a/e) ranged from 0.125 to 0.5. Reynolds number ranged from 6000 to 24,000, in experiments. Heat transfer enhancement, pressure loss, and aerothermal performance in a rectangular channel with notched baffles were examined. Compared to the solid transverse baffle (SB, a/e = 0), the NBs with a/e = 0.125 increased the heat transfer rate while lessening the pressure loss, as shown by the experimental findings. Obviously, Nusselt number, friction factor and aerothermal performance increased as the a/e ratio decreased. The NBs with the smallest notch height-to-baffle height ratio (a/e = 0.125) exhibited the highest aerothermal performance of 1.17, which can be attributed to the efficient heat transfer enhancement by the strong multi-jet impingements and the moderate friction loss penalty resulting from the presence of notches (spaces) on the baffles.http://www.sciencedirect.com/science/article/pii/S2214157X23003763ChannelHeat transfer enhancementNotched baffleSolid baffleTransverse baffle |
| spellingShingle | Arnut Phila Warin Keaitnukul Smith Eiamsa-ard Paisarn Naphon Naoki Maruyama Masafumi Hirota Varesa Chuwattanakul Influence of notched baffles on aerothermal performance behaviors in a channel Case Studies in Thermal Engineering Channel Heat transfer enhancement Notched baffle Solid baffle Transverse baffle |
| title | Influence of notched baffles on aerothermal performance behaviors in a channel |
| title_full | Influence of notched baffles on aerothermal performance behaviors in a channel |
| title_fullStr | Influence of notched baffles on aerothermal performance behaviors in a channel |
| title_full_unstemmed | Influence of notched baffles on aerothermal performance behaviors in a channel |
| title_short | Influence of notched baffles on aerothermal performance behaviors in a channel |
| title_sort | influence of notched baffles on aerothermal performance behaviors in a channel |
| topic | Channel Heat transfer enhancement Notched baffle Solid baffle Transverse baffle |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23003763 |
| work_keys_str_mv | AT arnutphila influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT warinkeaitnukul influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT smitheiamsaard influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT paisarnnaphon influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT naokimaruyama influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT masafumihirota influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel AT varesachuwattanakul influenceofnotchedbafflesonaerothermalperformancebehaviorsinachannel |