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Computational study of unsteady mixed convection heat transfer of nanofluids in a 3D closed lid-driven cavity

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journal contribution
posted on 07.03.2017, 15:46 by Ali Khaleel Kareem, Shian Gao
Mixed heat convection of three-dimensional unsteady flow of four different types of fluids in a double lid-driven enclosure is simulated by a two-phase mixture model in this project. The cubic cavity with moving isothermal sidewalls has uniform heat flux on the middle part of the bottom wall, and the other remaining walls forming the enclosure are adiabatic and stationary. The relevant parameters in the present research include Reynolds number Re (5000–30,000), nanoparticle diameter (25 nm–85 nm), and nanoparticle volume fraction (0.00–0.08). In general, remarkable effects on the heat transfer and fluid patterns are observed by using nanofluids in comparison to the conventional fluid. Different types of nanofluids or different diameters of nanoparticles can make pronounced changes in the heat convection ratio. In addition, increasing in either volume fraction of nanoparticles or Reynolds number leads to increasing in the Nusselt number, fluctuation kinetic energy and root mean square velocity of the fluid in the domain. It is also found that both URANS and LES methods have shown good performance in dealing with unsteady flow conducted in this project. However, the comparisons have elucidated clearly the advantages of the LES approach in predicting more detailed heat and flow structures.

Funding

The authors would like to thank the Ministry of Higher Education and Scientific Research of Iraq for the financial support of the project.

History

Citation

International Communications in Heat and Mass Transfer, 2017, 82, pp. 125-138

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

AM (Accepted Manuscript)

Published in

International Communications in Heat and Mass Transfer

Publisher

Elsevier

issn

0735-1933

Copyright date

2017

Available date

14/02/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S0735193317300118

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en