Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct
The current study aims to enhance the effectiveness of a cooling system by introducing vertical and detached obstacles within a rectangular channel to create singularities in the flow. This study focuses on a numerical simulation to investigate the effects of these detached obstacles on forced conve...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-05-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202725001727 |
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| author | Omar Ghoulam Hind Talbi Kamal Amghar Abdel-illah Amrani Adil Charef Ismael Driouch |
| author_facet | Omar Ghoulam Hind Talbi Kamal Amghar Abdel-illah Amrani Adil Charef Ismael Driouch |
| author_sort | Omar Ghoulam |
| collection | DOAJ |
| description | The current study aims to enhance the effectiveness of a cooling system by introducing vertical and detached obstacles within a rectangular channel to create singularities in the flow. This study focuses on a numerical simulation to investigate the effects of these detached obstacles on forced convective airflow (cooling fluid) in a turbulent flow within a heat exchanger's rectangular channel. The mathematical model governing the fluid flow and heat transfer is based on the Finite Volume Method (FVM) and solves the Navier-Stokes equations under the assumption of steady-state, incompressible flow with constant fluid properties. Two types of obstacles were considered: planar (Type A) and diamond-shaped (Type B), with four different spacings (S = s/2, S = s, S = 5s/4, and S = 3s/2). The simulations were carried out for Reynolds numbers (Re) ranging from 20,000 to 35,000. The CFD calculations employed the SIMPLE algorithm with the QUICK scheme for discretizing the governing equations. The analysis included the impact of obstacle geometry and spacing on hydrothermal interactions, focusing on axial velocity, dynamic pressure, local and average Nusselt numbers, friction factor, and thermal enhancement factor. The results show that diamond-shaped obstacles significantly outperform planar obstacles in terms of both hydrothermal performance and thermal enhancement. Additionally, increasing the distance between the detached obstacles leads to a higher average Nusselt number. |
| format | Article |
| id | doaj-art-9742eafad55e48d7ab181433a7eb64cc |
| institution | DOAJ |
| issn | 2666-2027 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-9742eafad55e48d7ab181433a7eb64cc2025-08-20T03:14:35ZengElsevierInternational Journal of Thermofluids2666-20272025-05-012710122510.1016/j.ijft.2025.101225Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger ductOmar Ghoulam0Hind Talbi1Kamal Amghar2Abdel-illah Amrani3Adil Charef4Ismael Driouch5Department LSIA, National School of Applied Sciences, Abdelmalek Essaâdi University, Al Hoceima, Morocco; Corresponding authors.Laboratory of Mechanics and Energy (LME), Faculty of Sciences, Mohammed First University, Oujda 60000, MoroccoDepartment LSIA, National School of Applied Sciences, Abdelmalek Essaâdi University, Al Hoceima, Morocco; Corresponding authors.Equipe des Energies Nouvelles et Ingénierie des Matériaux (ENIM), Laboratoire des Systèmes Intelligents Matériaux et Energies Durables (SIMED), Faculté des Sciences et Techniques, Moulay Ismail University of Meknes, Boutalamine BP 509, 52000 Errachidia, MoroccoGEMS Laboratory, University Ibn Zohr, ENSA, B.P. 1136, Agadir, Morocco; High School of Technology, University of Moulay Ismail, B.P. 3103, MoroccoDepartment LSIA, National School of Applied Sciences, Abdelmalek Essaâdi University, Al Hoceima, MoroccoThe current study aims to enhance the effectiveness of a cooling system by introducing vertical and detached obstacles within a rectangular channel to create singularities in the flow. This study focuses on a numerical simulation to investigate the effects of these detached obstacles on forced convective airflow (cooling fluid) in a turbulent flow within a heat exchanger's rectangular channel. The mathematical model governing the fluid flow and heat transfer is based on the Finite Volume Method (FVM) and solves the Navier-Stokes equations under the assumption of steady-state, incompressible flow with constant fluid properties. Two types of obstacles were considered: planar (Type A) and diamond-shaped (Type B), with four different spacings (S = s/2, S = s, S = 5s/4, and S = 3s/2). The simulations were carried out for Reynolds numbers (Re) ranging from 20,000 to 35,000. The CFD calculations employed the SIMPLE algorithm with the QUICK scheme for discretizing the governing equations. The analysis included the impact of obstacle geometry and spacing on hydrothermal interactions, focusing on axial velocity, dynamic pressure, local and average Nusselt numbers, friction factor, and thermal enhancement factor. The results show that diamond-shaped obstacles significantly outperform planar obstacles in terms of both hydrothermal performance and thermal enhancement. Additionally, increasing the distance between the detached obstacles leads to a higher average Nusselt number.http://www.sciencedirect.com/science/article/pii/S2666202725001727Turbulent flowDiamond shapesDetached obstaclesHeat exchangerRectangular channelThermal enhancement factor |
| spellingShingle | Omar Ghoulam Hind Talbi Kamal Amghar Abdel-illah Amrani Adil Charef Ismael Driouch Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct International Journal of Thermofluids Turbulent flow Diamond shapes Detached obstacles Heat exchanger Rectangular channel Thermal enhancement factor |
| title | Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| title_full | Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| title_fullStr | Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| title_full_unstemmed | Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| title_short | Heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| title_sort | heat transfer improvement in turbulent flow using detached obstacles in heat exchanger duct |
| topic | Turbulent flow Diamond shapes Detached obstacles Heat exchanger Rectangular channel Thermal enhancement factor |
| url | http://www.sciencedirect.com/science/article/pii/S2666202725001727 |
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