Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli
In this paper, second law analysis for calculations of the entropy generation due to the flow andheat transfer of water-Al2O3 and ethylene glycol-Al2O3 nanofluids inside annuli is presented. Thephysical properties of the nanofluids are calculated using empirical correlations. Constant heatfluxes at...
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| Format: | Article |
| Language: | English |
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Semnan University
2014-05-01
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| Series: | Journal of Heat and Mass Transfer Research |
| Subjects: | |
| Online Access: | https://jhmtr.semnan.ac.ir/article_151_c39cb6485723d5489b60e3a2272e7cff.pdf |
| _version_ | 1797259631286812672 |
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| author | Roohollah Rafee |
| author_facet | Roohollah Rafee |
| author_sort | Roohollah Rafee |
| collection | DOAJ |
| description | In this paper, second law analysis for calculations of the entropy generation due to the flow andheat transfer of water-Al2O3 and ethylene glycol-Al2O3 nanofluids inside annuli is presented. Thephysical properties of the nanofluids are calculated using empirical correlations. Constant heatfluxes at inner surface of the annuli are considered and fully developed condition for fluid flowand heat transfer is assumed. The control volume approach is selected for calculation of theentropy generation. Total entropy generation for different values of the nanoparticles volumefractions at different geometrical ratios is obtained and compared with those of the base fluid.Also, the geometrical ratios at which the minimum entropy generation is achieved are presented.The results show that when the ratio of the annuli length to its hydraulic diameter (L/Dh) exceedssome critical values, adding of the nanoparticles is not efficient. For each value of thenanoparticles concentration, there is a length ratio (L/Dh) at which the entropy generation isminimized. |
| first_indexed | 2024-04-24T23:12:30Z |
| format | Article |
| id | doaj.art-4a6bc7a902d847e299e819a5bc4f7634 |
| institution | Directory Open Access Journal |
| issn | 2345-508X 2383-3068 |
| language | English |
| last_indexed | 2024-04-24T23:12:30Z |
| publishDate | 2014-05-01 |
| publisher | Semnan University |
| record_format | Article |
| series | Journal of Heat and Mass Transfer Research |
| spelling | doaj.art-4a6bc7a902d847e299e819a5bc4f76342024-03-17T08:03:09ZengSemnan UniversityJournal of Heat and Mass Transfer Research2345-508X2383-30682014-05-0111253310.22075/jhmtr.2014.151151Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuliRoohollah Rafee0Faculty of mechanical engineering, Semnan University, Semnan, IranIn this paper, second law analysis for calculations of the entropy generation due to the flow andheat transfer of water-Al2O3 and ethylene glycol-Al2O3 nanofluids inside annuli is presented. Thephysical properties of the nanofluids are calculated using empirical correlations. Constant heatfluxes at inner surface of the annuli are considered and fully developed condition for fluid flowand heat transfer is assumed. The control volume approach is selected for calculation of theentropy generation. Total entropy generation for different values of the nanoparticles volumefractions at different geometrical ratios is obtained and compared with those of the base fluid.Also, the geometrical ratios at which the minimum entropy generation is achieved are presented.The results show that when the ratio of the annuli length to its hydraulic diameter (L/Dh) exceedssome critical values, adding of the nanoparticles is not efficient. For each value of thenanoparticles concentration, there is a length ratio (L/Dh) at which the entropy generation isminimized.https://jhmtr.semnan.ac.ir/article_151_c39cb6485723d5489b60e3a2272e7cff.pdfsecond law of thermodynamicsentropy generationnanofluidsheat transferannulilaminar flow |
| spellingShingle | Roohollah Rafee Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli Journal of Heat and Mass Transfer Research second law of thermodynamics entropy generation nanofluids heat transfer annuli laminar flow |
| title | Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| title_full | Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| title_fullStr | Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| title_full_unstemmed | Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| title_short | Entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| title_sort | entropy generation calculation for laminar fully developed forced flow and heat transfer of nanofluids inside annuli |
| topic | second law of thermodynamics entropy generation nanofluids heat transfer annuli laminar flow |
| url | https://jhmtr.semnan.ac.ir/article_151_c39cb6485723d5489b60e3a2272e7cff.pdf |
| work_keys_str_mv | AT roohollahrafee entropygenerationcalculationforlaminarfullydevelopedforcedflowandheattransferofnanofluidsinsideannuli |