Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

Ahmed, Syed Muzamil and Kazi, Salim Newaz and Khan, Ghulamullah and Zubir, Mohd Nashrul Mohd and Dahari, Mahidzal and Ibrahim, Suriani and Abu Talip, Mohamad Sofian and Ahmad, Pervaiz and Chowdhury, Zaira Zaman (2019) Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach. Thermal Science, 23 (3 Part). pp. 1779-1789. ISSN 0354-9836

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Official URL: https://doi.org/10.2298/TSCI170606236A

Abstract

Experimental study of nanofluid flow and heat transfer to fully developed turbulent forced convection flow in a uniformly heated tubular horizontal backward-facing step has reported in the present study. To study the forced convective heat transfer coefficient in the turbulent regime, an experimental study is performed at a different weight concentration of Al2O3 nanoparticles. The experiment had conducted for water and Alumina-water nanofluid for the concentration range of 0 to 0.1 wt.% and Reynolds number of 4000 to 16000. The average heat transfer coefficient ratio increases significantly as Reynolds number increasing, increased from 9.6% at Re of 4000 to 26.3% at Re of 16,000 at the constant weight concentration of 0.1%. Alumina-water nanofluid exhibited excellent thermal performance in the tube with a backward-facing step in comparison to distilled water. However, the pressure losses increased with the increase of the Reynolds number and/or the weight concentrations, but the enhancement rates were insignificant.

Item Type: Article
Uncontrolled Keywords: backward-facing step; heat transfer; nanofluids; re-circulation flow
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Sep 2019 01:24
Last Modified: 30 Sep 2019 01:24
URI: http://eprints.um.edu.my/id/eprint/22618

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