Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes
In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row stagg...
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MDPI AG
2021-10-01
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| author | Fares Djeffal Lyes Bordja Redha Rebhi Mustafa Inc Hijaz Ahmad Farouk Tahrour Houari Ameur Younes Menni Giulio Lorenzini Sayed K. Elagan Taghreed M. Jawa |
| author_facet | Fares Djeffal Lyes Bordja Redha Rebhi Mustafa Inc Hijaz Ahmad Farouk Tahrour Houari Ameur Younes Menni Giulio Lorenzini Sayed K. Elagan Taghreed M. Jawa |
| author_sort | Fares Djeffal |
| collection | DOAJ |
| description | In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems. |
| first_indexed | 2024-03-10T06:45:30Z |
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| id | doaj.art-912d79c84a154f07bd94803ceaf1ce16 |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T06:45:30Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-912d79c84a154f07bd94803ceaf1ce162023-11-22T17:19:13ZengMDPI AGApplied Sciences2076-34172021-10-011120947710.3390/app11209477Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube ShapesFares Djeffal0Lyes Bordja1Redha Rebhi2Mustafa Inc3Hijaz Ahmad4Farouk Tahrour5Houari Ameur6Younes Menni7Giulio Lorenzini8Sayed K. Elagan9Taghreed M. Jawa10Department of Mechanical Engineering, University of Oum El Bouaghi, Oum El Bouaghi 04000, AlgeriaDepartment of Mechanical Engineering, University of Oum El Bouaghi, Oum El Bouaghi 04000, AlgeriaDepartment of Mechanical Engineering, Faculty of Technology, University of Medea, Medea 26000, AlgeriaDepartment of Computer Engineering, Biruni University, Istanbul 34025, TurkeyDepartment of Basic Science, University of Engineering and Technology, Peshawar 25000, PakistanDepartment of Physics, University of M’sila, M’sila 28000, AlgeriaDepartment of Technology, University Centre of Naama, P.O. Box 66, Naama 45000, AlgeriaDepartment of Technology, University Centre of Naama, P.O. Box 66, Naama 45000, AlgeriaDepartment of Engineering and Architecture, University of Parma, Parco Area delle Scienze, 181/A, 43124 Parma, ItalyDepartment of Mathematics and Statistics, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi ArabiaDepartment of Mathematics and Statistics, College of Sciences, Taif University, P.O. Box 11099, Taif 21944, Saudi ArabiaIn this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems.https://www.mdpi.com/2076-3417/11/20/9477heat exchangertube shapesflat tubeoval tubeannular finthermal-hydraulics |
| spellingShingle | Fares Djeffal Lyes Bordja Redha Rebhi Mustafa Inc Hijaz Ahmad Farouk Tahrour Houari Ameur Younes Menni Giulio Lorenzini Sayed K. Elagan Taghreed M. Jawa Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes Applied Sciences heat exchanger tube shapes flat tube oval tube annular fin thermal-hydraulics |
| title | Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes |
| title_full | Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes |
| title_fullStr | Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes |
| title_full_unstemmed | Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes |
| title_short | Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes |
| title_sort | numerical investigation of thermal flow characteristics in heat exchanger with various tube shapes |
| topic | heat exchanger tube shapes flat tube oval tube annular fin thermal-hydraulics |
| url | https://www.mdpi.com/2076-3417/11/20/9477 |
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