Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel
Present study explores mixed convection characteristics in a long horizontal channel subjected to multiple periodically distributed flow modulators. The flow modulators are represented by oscillating blades placed along a centerline of the channel whose lower and upper walls are kept at constant hig...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-11-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202724002581 |
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| author | Sadib Fardin Md. Jawarul Moresalein Md. Samin Ashiq Aziz Sumon Saha Mohammad Nasim Hasan |
| author_facet | Sadib Fardin Md. Jawarul Moresalein Md. Samin Ashiq Aziz Sumon Saha Mohammad Nasim Hasan |
| author_sort | Sadib Fardin |
| collection | DOAJ |
| description | Present study explores mixed convection characteristics in a long horizontal channel subjected to multiple periodically distributed flow modulators. The flow modulators are represented by oscillating blades placed along a centerline of the channel whose lower and upper walls are kept at constant high and low temperatures respectively. In replicating the blade oscillation, moving mesh approach has been adopted within Arbitrary Lagrangian–Eulerian (ALE) framework for a representative periodical unit. The corresponding non-dimensional governing mass, momentum and energy conservation equations have been solved through Galerkin finite element solver for a wide variations of modulator's dynamic condition (oscillating frequency and maximum angular displacement) for different fluids represented by Prandtl number. Heat transfer performance of the system has been demonstrated in terms of spatially-averaged transient as well as time-averaged Nusselt number while qualitative analysis of fluid flow and thermal field has been presented as streamline and isotherm plots. Present study indicates that the time averaged Nusselt number undergoes significant variation with blade oscillating frequency and maximum angular displacement depending on both the Prandtl number and Reynolds Number. Power spectrum analysis obtained through Fast Fourier Transformation (FFT) of the imposed blade frequency and induced thermal frequency reveals different correlation depending on the blade frequency. Blade friction power requirement has been found to increase at higher blade frequency as well as maximum angular displacement. However, contrary to power consumption, increase in frequency does not result in a significant rise in heat transfer. Consequently, specific heat transfer decreases at higher blade oscillating frequency and maximum angular displacement. |
| format | Article |
| id | doaj-art-e129102d08ca4e7d9373b26f5236bdaf |
| institution | OA Journals |
| issn | 2666-2027 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-e129102d08ca4e7d9373b26f5236bdaf2025-08-20T02:38:13ZengElsevierInternational Journal of Thermofluids2666-20272024-11-012410081710.1016/j.ijft.2024.100817Role of periodic oscillating flow modulators on mixed convection in a long horizontal channelSadib Fardin0Md. Jawarul Moresalein1Md. Samin Ashiq Aziz2Sumon Saha3Mohammad Nasim Hasan4Department of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, BangladeshDepartment of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, BangladeshDepartment of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, BangladeshDepartment of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, BangladeshCorresponding author.; Department of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, BangladeshPresent study explores mixed convection characteristics in a long horizontal channel subjected to multiple periodically distributed flow modulators. The flow modulators are represented by oscillating blades placed along a centerline of the channel whose lower and upper walls are kept at constant high and low temperatures respectively. In replicating the blade oscillation, moving mesh approach has been adopted within Arbitrary Lagrangian–Eulerian (ALE) framework for a representative periodical unit. The corresponding non-dimensional governing mass, momentum and energy conservation equations have been solved through Galerkin finite element solver for a wide variations of modulator's dynamic condition (oscillating frequency and maximum angular displacement) for different fluids represented by Prandtl number. Heat transfer performance of the system has been demonstrated in terms of spatially-averaged transient as well as time-averaged Nusselt number while qualitative analysis of fluid flow and thermal field has been presented as streamline and isotherm plots. Present study indicates that the time averaged Nusselt number undergoes significant variation with blade oscillating frequency and maximum angular displacement depending on both the Prandtl number and Reynolds Number. Power spectrum analysis obtained through Fast Fourier Transformation (FFT) of the imposed blade frequency and induced thermal frequency reveals different correlation depending on the blade frequency. Blade friction power requirement has been found to increase at higher blade frequency as well as maximum angular displacement. However, contrary to power consumption, increase in frequency does not result in a significant rise in heat transfer. Consequently, specific heat transfer decreases at higher blade oscillating frequency and maximum angular displacement.http://www.sciencedirect.com/science/article/pii/S2666202724002581Oscillating bladeMaximum angular displacementHeat transfer enhancementFFT analysisSpecific heat transfer |
| spellingShingle | Sadib Fardin Md. Jawarul Moresalein Md. Samin Ashiq Aziz Sumon Saha Mohammad Nasim Hasan Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel International Journal of Thermofluids Oscillating blade Maximum angular displacement Heat transfer enhancement FFT analysis Specific heat transfer |
| title | Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| title_full | Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| title_fullStr | Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| title_full_unstemmed | Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| title_short | Role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| title_sort | role of periodic oscillating flow modulators on mixed convection in a long horizontal channel |
| topic | Oscillating blade Maximum angular displacement Heat transfer enhancement FFT analysis Specific heat transfer |
| url | http://www.sciencedirect.com/science/article/pii/S2666202724002581 |
| work_keys_str_mv | AT sadibfardin roleofperiodicoscillatingflowmodulatorsonmixedconvectioninalonghorizontalchannel AT mdjawarulmoresalein roleofperiodicoscillatingflowmodulatorsonmixedconvectioninalonghorizontalchannel AT mdsaminashiqaziz roleofperiodicoscillatingflowmodulatorsonmixedconvectioninalonghorizontalchannel AT sumonsaha roleofperiodicoscillatingflowmodulatorsonmixedconvectioninalonghorizontalchannel AT mohammadnasimhasan roleofperiodicoscillatingflowmodulatorsonmixedconvectioninalonghorizontalchannel |