A numerical investigation of combined effect of nanofluids and impinging jets for different parameter

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Tarih

2019

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Gazi Univ, Fac Engineering Architecture

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

In this study; enhancement of heat transfer on a high heat-flux surface is investigated numerically by using nanofluids with impinging jet technique. Heat transfer from flat copper surface was studied for different Reynolds number (Re=12000, 14000, 16000, 18000), different particle diameter of nanofluid (Dp=10nm, 20nm, 40nm, 80nm), different volume fraction of nanofluid (phi=% 2, % 4, % 6, % 8), and different types of nanofluids (CuO-water, NiO-water, Cu-water, pure water). The low Reynolds number k-e turbulence model of the PHOENICS CFD program was used in the study. As a result; increasing Re number from 12000 to 18000 resulted in an increase of 28% on average Nusselt number. It has been obtained that decreasing particle diameter from 80nm to 10nm causes an increase of 13.20% on average Nusselt number. It has been determined that increasing volume ration more than 4% does not cause a significant increase in heat transfer. In the case of using different types of nanofluids, the best heat transfer performance is obtained when Cuwater nanofluid is used. Using Cu-water nanofluid showed an enhancement of 8.3% on average Nusselt number compared to pure water. Moreover; it has been shown that the low Reynolds number k-epsilon turbulence model can well represent the temperature distribution and flow properties.

Açıklama

Anahtar Kelimeler

Impinging jet, nanofluid, heat transfer, computational fluid dynamics

Kaynak

Journal of The Faculty of Engineering and Architecture of Gazi University

WoS Q Değeri

Q4

Scopus Q Değeri

Q2

Cilt

34

Sayı

3

Künye