Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions
Nanofluids in microchannels have been a promising possibility for electronic cooling uses due to high heat removal rates and reduced energy consumption. This study conducts the experimental measurements to analyze the combined effects of concentration of nanoparticles and geometrical design in terms...
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Elsevier
2025-01-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202724004750 |
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| author | An-Shik Yang Yen-Ren Liao Zhengtong Li Chih-Yung Wen Yee-Ting Lee |
| author_facet | An-Shik Yang Yen-Ren Liao Zhengtong Li Chih-Yung Wen Yee-Ting Lee |
| author_sort | An-Shik Yang |
| collection | DOAJ |
| description | Nanofluids in microchannels have been a promising possibility for electronic cooling uses due to high heat removal rates and reduced energy consumption. This study conducts the experimental measurements to analyze the combined effects of concentration of nanoparticles and geometrical design in terms of the aspect ratio (AR) and hydraulic diameter (Dh) on the thermal and frictional outcomes of Al2O3/water nanofluids throughout the microchannels at varied Reynolds numbers and heat loads. Theoretically, the computational fluid dynamics (CFD) simulations are performed using the three-dimensional (3D) single-phase and mixture models to determine the velocity, temperature and nanoparticle concentration distributions. The predicted heat transfer coefficients and pressure drops using the mixture model agree well with the experimental data for model validation. In the impact study, an increase in AR from 2.0 to 5.0 can increase the average pressure drop and heat transfer coefficient by 28.2 %-41.5 % and 23.9 %-38.3 % over the Reynolds numbers of 300–1900, respectively. In contrast, the decline of Dh from 1.38 mm to 0.92 mm can intensify flow resistance and heat transfer by 24.4 %-35.5 % and 21.3 %-36.6 %. Among the assessments of four well-known correlations, the related correlation from Chen and Cheng achieves the most accurate estimates of the Nusselt number of Al2O3/water nanofluid. The microchannel layout with an aspect ratio of 5.0 can achieve the thermal performance factor up to 1.17. |
| format | Article |
| id | doaj-art-f1c57b3577274982980094d2179b969a |
| institution | Kabale University |
| issn | 2666-2027 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-f1c57b3577274982980094d2179b969a2025-01-08T04:53:41ZengElsevierInternational Journal of Thermofluids2666-20272025-01-0125101036Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutionsAn-Shik Yang0Yen-Ren Liao1Zhengtong Li2Chih-Yung Wen3Yee-Ting Lee4Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 106, Taiwan, PR China; Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei 106, Taiwan, PR ChinaDepartment of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 106, Taiwan, PR China; Research Center of Energy Conservation for New Generation of Residential, Commercial, and Industrial Sectors, National Taipei University of Technology, Taipei 106, Taiwan, PR ChinaDepartment of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong KongDepartment of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong KongDepartment of Greenergy, National University of Tainan, Tainan 700, Taiwan, PR China; Corresponding author at: Department of Greenery, National University of Tainan, 33, Sec. 2, Shu-Lin St., Tainan 701, Taiwan, PR China.Nanofluids in microchannels have been a promising possibility for electronic cooling uses due to high heat removal rates and reduced energy consumption. This study conducts the experimental measurements to analyze the combined effects of concentration of nanoparticles and geometrical design in terms of the aspect ratio (AR) and hydraulic diameter (Dh) on the thermal and frictional outcomes of Al2O3/water nanofluids throughout the microchannels at varied Reynolds numbers and heat loads. Theoretically, the computational fluid dynamics (CFD) simulations are performed using the three-dimensional (3D) single-phase and mixture models to determine the velocity, temperature and nanoparticle concentration distributions. The predicted heat transfer coefficients and pressure drops using the mixture model agree well with the experimental data for model validation. In the impact study, an increase in AR from 2.0 to 5.0 can increase the average pressure drop and heat transfer coefficient by 28.2 %-41.5 % and 23.9 %-38.3 % over the Reynolds numbers of 300–1900, respectively. In contrast, the decline of Dh from 1.38 mm to 0.92 mm can intensify flow resistance and heat transfer by 24.4 %-35.5 % and 21.3 %-36.6 %. Among the assessments of four well-known correlations, the related correlation from Chen and Cheng achieves the most accurate estimates of the Nusselt number of Al2O3/water nanofluid. The microchannel layout with an aspect ratio of 5.0 can achieve the thermal performance factor up to 1.17.http://www.sciencedirect.com/science/article/pii/S2666202724004750NanofluidsMicrochannelAspect ratioThermal performanceCFD simulation |
| spellingShingle | An-Shik Yang Yen-Ren Liao Zhengtong Li Chih-Yung Wen Yee-Ting Lee Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions International Journal of Thermofluids Nanofluids Microchannel Aspect ratio Thermal performance CFD simulation |
| title | Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions |
| title_full | Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions |
| title_fullStr | Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions |
| title_full_unstemmed | Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions |
| title_short | Experimental and numerical studies on thermal behavior and performance assessment of Al2O3/H2O nanofluids in microchannels for cooling solutions |
| title_sort | experimental and numerical studies on thermal behavior and performance assessment of al2o3 h2o nanofluids in microchannels for cooling solutions |
| topic | Nanofluids Microchannel Aspect ratio Thermal performance CFD simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2666202724004750 |
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