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Numerical investigation of mixed convection heat transfer of nanofluids in a lid-driven trapezoidal cavity

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journal contribution
posted on 19.12.2016, 13:03 by Ali Khaleel Kareem, H. A. Mohammed, Ahmed Kadhim Hussein, Shian Gao
Mixed convection heat transfer in a two-dimensional trapezoidal lid-driven enclosure filled with nanofluids heated from below is numerically studied. The governing equations for both fluid flow and heat transfer are solved by using the finite volume method (FVM). The bottom wall of the enclosure is heated while the upper wall is cooled at lower temperature and the other two sidewalls are adiabatic. Four types of nanofluids (Al₂O₃, CuO, SiO₂, and TiO₂ with pure water) with nanoparticle volume fraction (ϕ) in the range of 1–4% and nanoparticle diameter in the range of 25–70 nm were used. This investigation covers Richardson number and Reynolds number in the ranges of 0.1–10 and 100–1200, respectively. The trapezoidal lid-driven enclosure was studied for different rotational angles (Φ) in the range of 30°–60°, different inclination sidewalls angles (γ) in the range of 30°–60° and various aspect ratios (A) ranged from 0.5 to 2. This investigation is also examined the opposing and aiding flow conditions. The results show that all types of nanofluids have higher Nusselt number compared with pure water. It is found that SiO2–water has the highest Nusselt number followed by Al₂O₃–water, TiO₂–water, and CuO–water. The Nusselt number increases as the volume fraction increases but it decreases as the diameter of the nanoparticles of nanofluids increases. The Nusselt number increases with the decrease of rotational angle and inclination angle from 30° to 60° and with the increase of aspect ratio. The results of flow direction show that the aiding flow gives higher Nusselt number than the opposing flow.

History

Citation

International Communications in Heat and Mass Transfer, 2016, 77, pp. 195–205

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

2016

Available date

15/08/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S0735193316302305

Notes

The file associated with this record is under a 24 month embargo from publication in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en