Numerical investigation of combined effect of nanofluids and impinging jets on heated surface

Year 2018, Volume: 2 Issue: 1, 14 - 19, 15.04.2018

Mustafa Kılıç , Mahmut Yavuz İbrahim Halil Yılmaz

Abstract

Present study is focused on
numerical investigation of heat transfer and fluid flow from a heated surface
by using nanofluids and impinging jets. Effects of Reynolds number, different
particle diameter and different types of nanofluids (TiO₂-water,
CuO-water, NiO-water) on heat transfer and fluid flow were studied numerically.
TiO₂-water nanofluid was used as a base coolant. Three impinging
jets were used to cool the surface. It is obtained that increasing jet
velocities from Ren/Re1=1-1.33-1.67 to Ren/Re1=1-1.20-1.40 causes an increase
of 49.9% on average Nusselt number (ANN) but increasing jet velocities from
Ren/Re1=1-1.20-1.40 to Ren/Re1=1-1.17-1.33 causes a decrease of 4.6% on ANN.
Particle diameter from Dp=80nm to 10nm causes an increase of 2.9% on ANN. Using
NiO-Water nanofluid causes an increase of 1% on ANN with respect to CuO and
2.8% with respect to TiO₂-water. Low Re k-ε turbulent model of PHOENICS
CFD code was used for numerical analysis. Numerical results show a good
approximation to experimental results.

Keywords

Heat transfer, Multiple impinging jets, Nanofluids

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