Politeknik Dergisi 2147-9429 Gazi Üniversitesi 10.2339/politeknik.589390 Engineering Mühendislik The Effect of Turbulence Model and Nanofluid on Fluid Flow and Heat Transfer in a Narrow Rectangular Duct The Effect of Turbulence Model and Nanofluid on Fluid Flow and Heat Transfer in a Narrow Rectangular Duct https://orcid.org/0000-0003-0000-8662 Akbay Edaviye Sare GAZİ ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ, MAKİNE MÜHENDİSLİĞİ BÖLÜMÜ https://orcid.org/0000-0001-6888-5923 Dereli Berkay GAZİ ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ, MAKİNE MÜHENDİSLİĞİ BÖLÜMÜ https://orcid.org/0000-0001-5480-1039 Turgut Oğuz GAZİ ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİ, MAKİNE MÜHENDİSLİĞİ BÖLÜMÜ 06 01 2020 23 2 567 579 07 09 2019 09 06 2019 Copyright © 1998, Politeknik Dergisi 1998 Politeknik Dergisi

Theeffect of type of turbulence model and nanofluid on the heat transfer and fluidflow in a horizontal narrow rectangular duct is numerically studied underconstant wall heat flux boundary condition. Numerical study is carried outusing ANSYS Fluent 17.0 software. Examined parameters are the type ofturbulence model, the type of nanofluid, the volume fraction of nanoparticle innanofluid, and the Reynolds number. Three different k-e andfour different k-w turbulence models are employed. Aluminum oxideAl2O3-water and copper oxide CuO-water are used asnanofluids. Volume fractions of nanoparticles used are 0%, 0.1%, 0.5%, 1%, 2%and 4%. Reynolds number changes from 3×103 to 50×103.Results showed that k-ω standard turbulence model with low Reynolds numbercorrection gives better result. It is seen that both the type and the volumefraction of nanoparticle in nanofluid affect heat transfer and pressure drop.Using Al2O3 and CuO nanoparticles in water increasesthermal performance. It is found that the performance factor of CuO-waternanofluid is better than that of Al2O3-water nanofluid.It is seen that using turbulent fully developed flow correlations derived forcircular ducts may end up with incorrect results for the flow in two-dimensionalrectangular duct.

The effect of turbulence model and nanofluidon the heat transfer and fluid flow in a horizontal narrow rectangular duct is numericallystudied under constant wall heat flux boundary condition. Numerical study iscarried out using ANSYS Fluent 17.0 software. Examined parameters are the typeof turbulence model, the type of nanofluid, the volume fraction of nanofluid,and the Reynolds number. Three different k-eand four different k-w turbulencemodels are employed. Aluminum oxide Al2O3-water andcopper oxide CuO-water are used as nanofluids. Volume fractions ofnanoparticles used are 0%, 0.1%, 0.5%, 1%, 2% and 4%. Reynolds number changes from3×103 to 50×103. Results showed that k-ω standard turbulence model with low Reynolds numbercorrection gives better result. It is seen that both the type and volumefraction of nanofluid affect heat transfer and pressure drop. Using Al2O3and CuO nanoparticles in water increases thermal performance. It is found thatthe performance of CuO-water nanofluid is better than that of Al2O3-waternanofluid. It is seen that using turbulent fully developed correlations derivedfor circular ducts may end up with incorrect results for the flow in a twodimensional rectangular duct.

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