Abdulrazzaq, Tuqa and Togun, Hussein and Reza Safaei, Mohammad and Kazi, Salim Newaz and Mohd Ariffin, Mohd Khairol Anuar and Adam, Nor Mariah (2020) Effect of flow separation of TiO2 nanofluid on heat transfer in the annular space of two concentric cylinders. Thermal Science, 24 (2, A). pp. 1007-1018. ISSN 0354-9836, DOI https://doi.org/10.2298/TSCI180709321A.
Full text not available from this repository.Abstract
In the wake of energy crises, the researchers are encouraged to explore new ways of enhancement in the thermal performance of heat exchanging equipment. In the current research, the SST k-omega model and finite volume method were employed to augment heat transfer into the separation flow of TiO2 nanofluid in the annular space o f two concentric cylinders. In the present investigation TiO2 nanoparticles of volume fractions, 0.5%-2% at Reynolds number range of 10000-40000, and contraction ratios from 1 to 2 were considered al constant heal flux boundary condition. Simulation results reveal that the highest enhancement in the heat transfer coefficient is corresponding to the annular pipe with a contraction ratio of 2 due to the generated re-circulation flow zone that begins after the separation point on the wall. Further, the surface heat transfer coefficient enhances with the increase of nanoparticles volume fraction and Reynolds number. The velocity distribution profile before and after the steps reveals that increasing the height of the step and Reynolds number, re-circulation regions also increases. Numerical results indicate that the highest pressure drop occurs at the Re = 40000 and contraction ratio of 2.
| Item Type: | Article |
|---|---|
| Funders: | None |
| Uncontrolled Keywords: | Nanofluids; Re-circulation flow; Abrupt contraction; Concentric cylinders; Separation flow |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Engineering > Department of Mechanical Engineering |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 08 Nov 2024 01:32 |
| Last Modified: | 08 Nov 2024 01:32 |
| URI: | http://eprints.um.edu.my/id/eprint/36966 |
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