Entropy generation of nanofluid flow in a microchannel heat sink
Present study aims to investigate the effects of the presence of nano sized TiO2 particles in the base fluid on entropy generation rate in a microchannel heat sink. Pure water was chosen as base fluid, and TiO2 particles were suspended into the pure water in five different particle volume fractions...
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| Format: | Article |
| Language: | English |
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Elsevier
2018-06-01
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| Series: | Results in Physics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379718301426 |
| _version_ | 1818315692513951744 |
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| author | Eyuphan Manay Eda Feyza Akyürek Bayram Sahin |
| author_facet | Eyuphan Manay Eda Feyza Akyürek Bayram Sahin |
| author_sort | Eyuphan Manay |
| collection | DOAJ |
| description | Present study aims to investigate the effects of the presence of nano sized TiO2 particles in the base fluid on entropy generation rate in a microchannel heat sink. Pure water was chosen as base fluid, and TiO2 particles were suspended into the pure water in five different particle volume fractions of 0.25%, 0.5%, 1.0%, 1.5% and 2.0%. Under laminar, steady state flow and constant heat flux boundary conditions, thermal, frictional, total entropy generation rates and entropy generation number ratios of nanofluids were experimentally analyzed in microchannel flow for different channel heights of 200 µm, 300 µm, 400 µm and 500 µm. It was observed that frictional and total entropy generation rates increased as thermal entropy generation rate were decreasing with an increase in particle volume fraction. In microchannel flows, thermal entropy generation could be neglected due to its too low rate smaller than 1.10e−07 in total entropy generation. Higher channel heights caused higher thermal entropy generation rates, and increasing channel height yielded an increase from 30% to 52% in thermal entropy generation. When channel height decreased, an increase of 66%–98% in frictional entropy generation was obtained. Adding TiO2 nanoparticles into the base fluid caused thermal entropy generation to decrease about 1.8%–32.4%, frictional entropy generation to increase about 3.3%–21.6%. Keywords: Microchannel, Nanofluid, Entropy generation, TiO2 |
| first_indexed | 2024-12-13T09:09:35Z |
| format | Article |
| id | doaj.art-cde4cd1a91f4448582b39137b128365e |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-13T09:09:35Z |
| publishDate | 2018-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-cde4cd1a91f4448582b39137b128365e2022-12-21T23:52:58ZengElsevierResults in Physics2211-37972018-06-019615624Entropy generation of nanofluid flow in a microchannel heat sinkEyuphan Manay0Eda Feyza Akyürek1Bayram Sahin2Dept. of Mech. Eng, Faculty of Eng & Arc., Technical Univ. of Erzurum, Erzurum, Turkey; Corresponding author.Dept. of Mech. Eng, Faculty of Eng & Arc., Univ. of Gumushane, Gumushane, TurkeyDept. of Mech. Eng, Faculty of Eng & Arc., Technical Univ. of Erzurum, Erzurum, TurkeyPresent study aims to investigate the effects of the presence of nano sized TiO2 particles in the base fluid on entropy generation rate in a microchannel heat sink. Pure water was chosen as base fluid, and TiO2 particles were suspended into the pure water in five different particle volume fractions of 0.25%, 0.5%, 1.0%, 1.5% and 2.0%. Under laminar, steady state flow and constant heat flux boundary conditions, thermal, frictional, total entropy generation rates and entropy generation number ratios of nanofluids were experimentally analyzed in microchannel flow for different channel heights of 200 µm, 300 µm, 400 µm and 500 µm. It was observed that frictional and total entropy generation rates increased as thermal entropy generation rate were decreasing with an increase in particle volume fraction. In microchannel flows, thermal entropy generation could be neglected due to its too low rate smaller than 1.10e−07 in total entropy generation. Higher channel heights caused higher thermal entropy generation rates, and increasing channel height yielded an increase from 30% to 52% in thermal entropy generation. When channel height decreased, an increase of 66%–98% in frictional entropy generation was obtained. Adding TiO2 nanoparticles into the base fluid caused thermal entropy generation to decrease about 1.8%–32.4%, frictional entropy generation to increase about 3.3%–21.6%. Keywords: Microchannel, Nanofluid, Entropy generation, TiO2http://www.sciencedirect.com/science/article/pii/S2211379718301426 |
| spellingShingle | Eyuphan Manay Eda Feyza Akyürek Bayram Sahin Entropy generation of nanofluid flow in a microchannel heat sink Results in Physics |
| title | Entropy generation of nanofluid flow in a microchannel heat sink |
| title_full | Entropy generation of nanofluid flow in a microchannel heat sink |
| title_fullStr | Entropy generation of nanofluid flow in a microchannel heat sink |
| title_full_unstemmed | Entropy generation of nanofluid flow in a microchannel heat sink |
| title_short | Entropy generation of nanofluid flow in a microchannel heat sink |
| title_sort | entropy generation of nanofluid flow in a microchannel heat sink |
| url | http://www.sciencedirect.com/science/article/pii/S2211379718301426 |
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