Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects
This study investigates the heat transfer performance and thermo-hydraulic characteristics of nanofluids containing graphene nanoparticles in a water and ethylene glycol mixture. Results show that both nanofluid samples, with concentrations of 0.15% and 0.10% by volume, experience increased heat tra...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/acf7b2 |
| _version_ | 1797672935794671616 |
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| author | Periyannan Lakshmanan Saravanan Periyasamy Saranya kanagarajan Ratchagaraja Dhairiyasamy |
| author_facet | Periyannan Lakshmanan Saravanan Periyasamy Saranya kanagarajan Ratchagaraja Dhairiyasamy |
| author_sort | Periyannan Lakshmanan |
| collection | DOAJ |
| description | This study investigates the heat transfer performance and thermo-hydraulic characteristics of nanofluids containing graphene nanoparticles in a water and ethylene glycol mixture. Results show that both nanofluid samples, with concentrations of 0.15% and 0.10% by volume, experience increased heat transfer coefficients (h) compared to the base fluid under various operating conditions, with average reductions of approximately 21% and 26%, respectively. Additionally, the nanofluids exhibit higher friction losses and pressure drops compared to the base fluid. The friction factor and head loss increased by 8.7% and 7.7% for the 0.15% concentration sample and 12.7% and 12.4% for the 0.10% concentration sample. These findings indicate that the thermo-hydraulic performance of the nanofluids is unsatisfactory, offering limited advantages over the base fluid. Surprisingly, the sedimentation of nanoparticles in the test section leads to unexpected results. Contrary to typical observations, the higher concentration sample shows a lower head loss. This discrepancy is attributed to nanoparticle sedimentation, increasing friction factors, and pressure drops. The study also examines the thermal conductivity and viscosity of the nanofluids. It is found that even at low concentrations, graphene nanofluids exhibit higher thermal conductivity than the base fluid. The dynamic viscosity slightly increases with concentration, aligning well with theoretical models. Further research is needed to optimize nanofluid performance and address these issues in practical applications. |
| first_indexed | 2024-03-11T21:38:23Z |
| format | Article |
| id | doaj.art-1294466f9eeb4801891e565f59e78269 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-11T21:38:23Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-1294466f9eeb4801891e565f59e782692023-09-26T15:47:57ZengIOP PublishingMaterials Research Express2053-15912023-01-0110909500410.1088/2053-1591/acf7b2Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effectsPeriyannan Lakshmanan0Saravanan Periyasamy1Saranya kanagarajan2Ratchagaraja Dhairiyasamy3https://orcid.org/0000-0001-7528-7585Department of Mechanical Engineering, Mahendra Engineering College , Namakkal, Tamil Nadu, IndiaDepartment of Aeronautical Engineering, Hindustan Institute of Technology and Science , Chennai, Tamil Nadu, IndiaDepartment of Physics, Government College of Engineering , Thanjavur, Tamil Nadu - 613 402, IndiaDepartment of Mechanical Engineering, Aksum University , Ethiopia, IndiaThis study investigates the heat transfer performance and thermo-hydraulic characteristics of nanofluids containing graphene nanoparticles in a water and ethylene glycol mixture. Results show that both nanofluid samples, with concentrations of 0.15% and 0.10% by volume, experience increased heat transfer coefficients (h) compared to the base fluid under various operating conditions, with average reductions of approximately 21% and 26%, respectively. Additionally, the nanofluids exhibit higher friction losses and pressure drops compared to the base fluid. The friction factor and head loss increased by 8.7% and 7.7% for the 0.15% concentration sample and 12.7% and 12.4% for the 0.10% concentration sample. These findings indicate that the thermo-hydraulic performance of the nanofluids is unsatisfactory, offering limited advantages over the base fluid. Surprisingly, the sedimentation of nanoparticles in the test section leads to unexpected results. Contrary to typical observations, the higher concentration sample shows a lower head loss. This discrepancy is attributed to nanoparticle sedimentation, increasing friction factors, and pressure drops. The study also examines the thermal conductivity and viscosity of the nanofluids. It is found that even at low concentrations, graphene nanofluids exhibit higher thermal conductivity than the base fluid. The dynamic viscosity slightly increases with concentration, aligning well with theoretical models. Further research is needed to optimize nanofluid performance and address these issues in practical applications.https://doi.org/10.1088/2053-1591/acf7b2nanofluidsgraphene nanoparticlesheat transfer performancethermo-hydraulic characteristicssedimentation effects |
| spellingShingle | Periyannan Lakshmanan Saravanan Periyasamy Saranya kanagarajan Ratchagaraja Dhairiyasamy Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects Materials Research Express nanofluids graphene nanoparticles heat transfer performance thermo-hydraulic characteristics sedimentation effects |
| title | Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects |
| title_full | Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects |
| title_fullStr | Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects |
| title_full_unstemmed | Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects |
| title_short | Analysis of heat transfer performance and thermo-hydraulic characteristics of graphene nanofluids: impact of sedimentation effects |
| title_sort | analysis of heat transfer performance and thermo hydraulic characteristics of graphene nanofluids impact of sedimentation effects |
| topic | nanofluids graphene nanoparticles heat transfer performance thermo-hydraulic characteristics sedimentation effects |
| url | https://doi.org/10.1088/2053-1591/acf7b2 |
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