THERMAL SCIENCE

International Scientific Journal

Syed Muzamil Ahmed

,

Salim Newaz Kazi

,

Ghulamullah Khan

,

Mohd Nashrul Mohd Zubir

,

Mahidzal Dahari

,

Suriani Ibrahim

,

Mohammad Sofian Abu Talip

,

Pervaiz Ahmad

,

Zaira Zaman Chowdhury

TOWARD IMPROVED HEAT DISSIPATION OF THE TURBULENT REGIME OVER BACKWARD-FACING STEP FOR THE AL2O3-WATER NANOFLUIDS: AN EXPERIMENTAL APPROACH

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 Al2O3 -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 Reynolds number of 4000 to 26.3% at Reynolds number of 16000 at the constant weight concentration of 0.1%. The Al2O3 water nanofluid exhibited excellent thermal performance in the tube with a backwardfacing 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.
KEYWORDS
backward-facing step, heat transfer, nanofluids, Recirculation flow
PAPER SUBMITTED: 2017-06-06
PAPER REVISED: 2018-05-15
PAPER ACCEPTED: 2018-07-07
PUBLISHED ONLINE: 2018-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI170606236A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 3, PAGES [1779 - 1789]
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Toward improved heat dissipation of the turbulent regime over backward-facing step for the AL2O3-water nanofluids: An experimental approach

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