Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels
This study investigates a three-dimensional elliptical microchannel heat sink for heat dissipation in laminar forced convection. The study seeks to improve thermal performance and overcome overheating associated with excessive temperature commonly experienced in heat-generating equipment, which is...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Faculty of Engineering and Technology
2022-12-01
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| Series: | Nigerian Journal of Technological Development |
| Subjects: | |
| Online Access: | https://www.journal.njtd.com.ng/index.php/njtd/article/view/1220 |
| _version_ | 1797870013367975936 |
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| author | O. T. Olakoyejo A. O. Adelaja S. M. Abolarin O. O. Adewumi M. O. Oyekeye A. A. Oluwo O. Oluwatusin A. Mwesigye |
| author_facet | O. T. Olakoyejo A. O. Adelaja S. M. Abolarin O. O. Adewumi M. O. Oyekeye A. A. Oluwo O. Oluwatusin A. Mwesigye |
| author_sort | O. T. Olakoyejo |
| collection | DOAJ |
| description |
This study investigates a three-dimensional elliptical microchannel heat sink for heat dissipation in laminar forced convection. The study seeks to improve thermal performance and overcome overheating associated with excessive temperature commonly experienced in heat-generating equipment, which is beyond the temperature usually specified by the manufacturer. The objective of the study is to evaluate the heat transfer, fluid flow, and entropy generation characteristics of Al2O3-water nanofluid in an elliptical cooling channel. The numerical analysis is investigated on the structure experiencing constant volumetric heat generation. The parameters considered are Reynolds number of 100 ≤ Re ≤ 500, nanoparticle concentration ϕ, from 0% to 4% with channel aspect ratio Ar from 1 to 3. The impacts of these parameters on the maximum temperature, heat transfer coefficient, friction factor, and volumetric entropy generation are reported. The study demonstrates that heat transfer is enhanced in the elliptical cooling channel at different aspect ratios, nanoparticle concentrations, and Reynold numbers. The results showed that as the nanoparticle concentration, channel aspect ratio, and Reynolds number (Re) increase, the maximum temperature, and total entropy generation decrease. As the channel aspect ratio increases at a specified Re = 200 and nanofluid concentration, ɸ = 3%, the maximum temperature, and total entropy generation decrease by up to 62% while the heat transfer coefficient increases by up to 78% and the friction factor increase by less than 2% with aspect ratio. However, the friction factor is not sensitive to the nanofluid concentration as a coolant.
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| first_indexed | 2024-04-10T00:21:41Z |
| format | Article |
| id | doaj.art-074d662c5bca4ad382c2744e918c6c49 |
| institution | Directory Open Access Journal |
| issn | 2437-2110 |
| language | English |
| last_indexed | 2024-04-10T00:21:41Z |
| publishDate | 2022-12-01 |
| publisher | Faculty of Engineering and Technology |
| record_format | Article |
| series | Nigerian Journal of Technological Development |
| spelling | doaj.art-074d662c5bca4ad382c2744e918c6c492023-03-15T22:32:41ZengFaculty of Engineering and TechnologyNigerian Journal of Technological Development2437-21102022-12-01194Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical ChannelsO. T. Olakoyejo0A. O. Adelaja1S. M. Abolarin2O. O. Adewumi3M. O. Oyekeye4A. A. Oluwo5O. Oluwatusin6A. Mwesigye7Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.1Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.University of The Free State, Bloemfontein, South Africa.1Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria.3Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, Calgary, Canada. This study investigates a three-dimensional elliptical microchannel heat sink for heat dissipation in laminar forced convection. The study seeks to improve thermal performance and overcome overheating associated with excessive temperature commonly experienced in heat-generating equipment, which is beyond the temperature usually specified by the manufacturer. The objective of the study is to evaluate the heat transfer, fluid flow, and entropy generation characteristics of Al2O3-water nanofluid in an elliptical cooling channel. The numerical analysis is investigated on the structure experiencing constant volumetric heat generation. The parameters considered are Reynolds number of 100 ≤ Re ≤ 500, nanoparticle concentration ϕ, from 0% to 4% with channel aspect ratio Ar from 1 to 3. The impacts of these parameters on the maximum temperature, heat transfer coefficient, friction factor, and volumetric entropy generation are reported. The study demonstrates that heat transfer is enhanced in the elliptical cooling channel at different aspect ratios, nanoparticle concentrations, and Reynold numbers. The results showed that as the nanoparticle concentration, channel aspect ratio, and Reynolds number (Re) increase, the maximum temperature, and total entropy generation decrease. As the channel aspect ratio increases at a specified Re = 200 and nanofluid concentration, ɸ = 3%, the maximum temperature, and total entropy generation decrease by up to 62% while the heat transfer coefficient increases by up to 78% and the friction factor increase by less than 2% with aspect ratio. However, the friction factor is not sensitive to the nanofluid concentration as a coolant. https://www.journal.njtd.com.ng/index.php/njtd/article/view/1220Forced convection Laminar flowMaximum temperatureHeat transfer coefficientEntropy generation rateNanofluid |
| spellingShingle | O. T. Olakoyejo A. O. Adelaja S. M. Abolarin O. O. Adewumi M. O. Oyekeye A. A. Oluwo O. Oluwatusin A. Mwesigye Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels Nigerian Journal of Technological Development Forced convection Laminar flow Maximum temperature Heat transfer coefficient Entropy generation rate Nanofluid |
| title | Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels |
| title_full | Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels |
| title_fullStr | Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels |
| title_full_unstemmed | Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels |
| title_short | Numerical Forced Convection Heat Transfer, Fluid Flow and Entropy Generation Analyses of Al2O3-Water Nanofluid in Elliptical Channels |
| title_sort | numerical forced convection heat transfer fluid flow and entropy generation analyses of al2o3 water nanofluid in elliptical channels |
| topic | Forced convection Laminar flow Maximum temperature Heat transfer coefficient Entropy generation rate Nanofluid |
| url | https://www.journal.njtd.com.ng/index.php/njtd/article/view/1220 |
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