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Numerical investigation of combined effect of nanofluids and multiple impinging jets on heat transfer

ABSTRACT
The present study is focused on numerical investigation of heat enhancement and fluid flow from a heated surface by using nanofluids with three impinging jets. Effects of different volume ratio, different heat flux and different types of nanofluids (CuO-water, Al2O3-water, Cu-water, TiO-water and pure water) on heat transfer and fluid flow were studied numerically. CuO-water nanofluid was used as a coolant in the other parameter. Three impinging jets were used to cool the surface. Low Re k-ε turbulent model of PHONEICS computational fluid dynamics code was used for numerical analysis. It is obtained that increasing volume ratio from φ=2% to 8% causes an increase of 10.4% on average Nusselt Number. Increasing heat flux six times has not a significant effect on average Nusselt number. Using Cu-water nanofluid causes an increase of 2.2%, 5.1%, 4.6% and 9.6% on average Nusselt number with respect to CuO-water, TiO-water, Al2O3-water and pure water.
KEYWORDS
PAPER SUBMITTED: 2017-12-04
PAPER REVISED: 2018-02-05
PAPER ACCEPTED: 2018-02-20
PUBLISHED ONLINE: 2018-03-04
DOI REFERENCE: https://doi.org/10.2298/TSCI171204094K
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