THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Toward improved heat dissipation of the turbulent regime over backward-facing step for the alumina-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 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.
KEYWORDS
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
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