Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach
Owing to higher thermal conductivity, nanofluids have the potential to be the coolant for various applications ranging from internal to external flows. A two-phase model is implemented to model the interaction between nanoparticles and base fluid to obtain accurate results. Heat transfer and entropy...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-11-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24012735 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846168270681407488 |
|---|---|
| author | Advait V. Krishna Anwesha Varma Kottayat Nidhul |
| author_facet | Advait V. Krishna Anwesha Varma Kottayat Nidhul |
| author_sort | Advait V. Krishna |
| collection | DOAJ |
| description | Owing to higher thermal conductivity, nanofluids have the potential to be the coolant for various applications ranging from internal to external flows. A two-phase model is implemented to model the interaction between nanoparticles and base fluid to obtain accurate results. Heat transfer and entropy generation characteristics of nanofluid (Al2O3 and water) flow over bluff bodies such as circular and square cylinders for steady (20 < Re < 100) and unsteady (Re = 150 and 300) flow conditions have been carried out for various volume fractions (0.5–2 %). The same has been expressed in quantitative and qualitative aspects with parameters such as mean Nusselt number, surface Nusselt number, heat transfer enhancement ratio, and entropy generation. Heat transfer rate increases with an increase in flow rate and volume fraction for both steady and unsteady flow. Heat transfer enhancement in steady flow ranges from 1.10 to 1.35. For unsteady flow (Re = 150 & Re = 300), nanofluid's heat transfer enhancement ratio is higher than water in the range of 1.10–1.8. This is attributed to the early separation of flow and the presence of large recirculatory regions. With the increase in Re, the entropy generation decreases for circular and square cylinders. Compared to nanofluid, the entropy generation is higher for water. |
| format | Article |
| id | doaj-art-9a095d03b0e94da9868f7a1b017a2166 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-9a095d03b0e94da9868f7a1b017a21662024-11-14T04:31:43ZengElsevierCase Studies in Thermal Engineering2214-157X2024-11-0163105242Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approachAdvait V. Krishna0Anwesha Varma1Kottayat Nidhul2Renewable Energy Center, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, IndiaRenewable Energy Center, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, IndiaCorresponding author.; Renewable Energy Center, Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, IndiaOwing to higher thermal conductivity, nanofluids have the potential to be the coolant for various applications ranging from internal to external flows. A two-phase model is implemented to model the interaction between nanoparticles and base fluid to obtain accurate results. Heat transfer and entropy generation characteristics of nanofluid (Al2O3 and water) flow over bluff bodies such as circular and square cylinders for steady (20 < Re < 100) and unsteady (Re = 150 and 300) flow conditions have been carried out for various volume fractions (0.5–2 %). The same has been expressed in quantitative and qualitative aspects with parameters such as mean Nusselt number, surface Nusselt number, heat transfer enhancement ratio, and entropy generation. Heat transfer rate increases with an increase in flow rate and volume fraction for both steady and unsteady flow. Heat transfer enhancement in steady flow ranges from 1.10 to 1.35. For unsteady flow (Re = 150 & Re = 300), nanofluid's heat transfer enhancement ratio is higher than water in the range of 1.10–1.8. This is attributed to the early separation of flow and the presence of large recirculatory regions. With the increase in Re, the entropy generation decreases for circular and square cylinders. Compared to nanofluid, the entropy generation is higher for water.http://www.sciencedirect.com/science/article/pii/S2214157X24012735NanofluidMixture modelHeat transfer enhancementUnsteady flowEntropy generation |
| spellingShingle | Advait V. Krishna Anwesha Varma Kottayat Nidhul Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach Case Studies in Thermal Engineering Nanofluid Mixture model Heat transfer enhancement Unsteady flow Entropy generation |
| title | Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach |
| title_full | Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach |
| title_fullStr | Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach |
| title_full_unstemmed | Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach |
| title_short | Heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow: A two-phase approach |
| title_sort | heat transfer and entropy generation characteristics of nanofluid flow over bluff bodies under steady and unsteady flow a two phase approach |
| topic | Nanofluid Mixture model Heat transfer enhancement Unsteady flow Entropy generation |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24012735 |
| work_keys_str_mv | AT advaitvkrishna heattransferandentropygenerationcharacteristicsofnanofluidflowoverbluffbodiesundersteadyandunsteadyflowatwophaseapproach AT anweshavarma heattransferandentropygenerationcharacteristicsofnanofluidflowoverbluffbodiesundersteadyandunsteadyflowatwophaseapproach AT kottayatnidhul heattransferandentropygenerationcharacteristicsofnanofluidflowoverbluffbodiesundersteadyandunsteadyflowatwophaseapproach |