Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions
This study examines the flow and thermal behavior of a power-law ferrofluid in a differentially heated enclosure containing a rectangular permanent magnet. The novelty of the present study lies in its exploration of the combined effects of magnetic and gravitational convection on the flow and therma...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24015776 |
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| author | Saleh Al Arni S.A.M. Mehryan Awatef Abidi Ahmad Hajjar Nidhal Ben Khedher Ibrahim Mahariq |
| author_facet | Saleh Al Arni S.A.M. Mehryan Awatef Abidi Ahmad Hajjar Nidhal Ben Khedher Ibrahim Mahariq |
| author_sort | Saleh Al Arni |
| collection | DOAJ |
| description | This study examines the flow and thermal behavior of a power-law ferrofluid in a differentially heated enclosure containing a rectangular permanent magnet. The novelty of the present study lies in its exploration of the combined effects of magnetic and gravitational convection on the flow and thermal behavior of a power-law ferrofluid in the presence of a permanent magnet with varying aspect ratios. Unlike previous studies, this work specifically investigates how the magnet's aspect ratio, location, and the ferrofluid's rheological properties influence heat transfer, particularly in microgravity environments. Moreover, the study assesses the impact of the temperature number and the magnetic and gravitational Rayleigh numbers on the flow, temperature distribution, and Nusselt number variations. Findings indicate that strong gravitational effects can hinder magnetic convection, whereas, in microgravity conditions, heat transfer is maximized with a thin magnet (aspect ratio 1:9) in the cavity, yielding up to a 94 % increase in the average Nusselt number compared to a square magnet of the same volume. The average Nusselt number can increase up to four times by reducing the power-law index from 1.3 to 0.7, and by about 70 % when the magnet is moved towards the left hot wall compared to its central placement. |
| format | Article |
| id | doaj-art-c9148d6f0cdc4029bab9cfecf0cc4f9c |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-c9148d6f0cdc4029bab9cfecf0cc4f9c2024-12-07T08:27:00ZengElsevierCase Studies in Thermal Engineering2214-157X2024-12-0164105546Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditionsSaleh Al Arni0S.A.M. Mehryan1Awatef Abidi2Ahmad Hajjar3Nidhal Ben Khedher4Ibrahim Mahariq5University of Ha'il, Department of Chemical Engineering, College of Engineering, P.O. Box 2440, 81441, Ha'il, Saudi ArabiaDepartment of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., P.O. Box 16765-1719, Tehran, Iran; Corresponding author. Department of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., P.O. Box 16765-1719, Tehran, Iran.Physics Department, College of Sciences Abha, King Khalid University, Saudi ArabiaCenter for Environmental Intelligence and College of Engineering and Computer Science, VinUniversity, Hanoi, Viet NamDepartment of Mechanical Engineering, College of Engineering, University of Ha’il, 81451, Ha’il City, Saudi ArabiaGUST Engineering and Applied Innovation Research Center (GEAR), Gulf University for Science and Technology, Mishref, Kuwait; Applied Science Research Center, Applied Science Private University, Amman, Jordan; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan; Corresponding author. GUST Engineering and Applied Innovation Research Center (GEAR), Gulf University for Science and Technology, Mishref, Kuwait.This study examines the flow and thermal behavior of a power-law ferrofluid in a differentially heated enclosure containing a rectangular permanent magnet. The novelty of the present study lies in its exploration of the combined effects of magnetic and gravitational convection on the flow and thermal behavior of a power-law ferrofluid in the presence of a permanent magnet with varying aspect ratios. Unlike previous studies, this work specifically investigates how the magnet's aspect ratio, location, and the ferrofluid's rheological properties influence heat transfer, particularly in microgravity environments. Moreover, the study assesses the impact of the temperature number and the magnetic and gravitational Rayleigh numbers on the flow, temperature distribution, and Nusselt number variations. Findings indicate that strong gravitational effects can hinder magnetic convection, whereas, in microgravity conditions, heat transfer is maximized with a thin magnet (aspect ratio 1:9) in the cavity, yielding up to a 94 % increase in the average Nusselt number compared to a square magnet of the same volume. The average Nusselt number can increase up to four times by reducing the power-law index from 1.3 to 0.7, and by about 70 % when the magnet is moved towards the left hot wall compared to its central placement.http://www.sciencedirect.com/science/article/pii/S2214157X24015776Non-Newtonian ferrofluidPermanent magnetMagneto-gravitational convectionMagnetic Rayleigh numberElectronic device |
| spellingShingle | Saleh Al Arni S.A.M. Mehryan Awatef Abidi Ahmad Hajjar Nidhal Ben Khedher Ibrahim Mahariq Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions Case Studies in Thermal Engineering Non-Newtonian ferrofluid Permanent magnet Magneto-gravitational convection Magnetic Rayleigh number Electronic device |
| title | Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions |
| title_full | Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions |
| title_fullStr | Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions |
| title_full_unstemmed | Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions |
| title_short | Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions |
| title_sort | heat transfer optimization in power law ferrofluids under gravitational and microgravity conditions |
| topic | Non-Newtonian ferrofluid Permanent magnet Magneto-gravitational convection Magnetic Rayleigh number Electronic device |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24015776 |
| work_keys_str_mv | AT salehalarni heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions AT sammehryan heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions AT awatefabidi heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions AT ahmadhajjar heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions AT nidhalbenkhedher heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions AT ibrahimmahariq heattransferoptimizationinpowerlawferrofluidsundergravitationalandmicrogravityconditions |