Dar Dikdörtgensel Bir Kanalda Türbülans Modelinin ve Nanoakışkanın Isı Transferine ve Akışkan Akışına Etkisinin Sayısal Olarak İncelenmesi

Türbülans modelinin ve nanoakışkanın, yatay dar dikdörtgen bir kanaldaki ısı transferi ve akışkan akışı üzerindeki etkisi duvarda sabit ısı akısı sınır koşulu altında sayısal olarak incelenmiştir. Sayısal çalışma ANSYS Fluent 17.0 yazılımı kullanılarak gerçekleştirilmiştir. İncelenen parametreler türbülans modeli tipi, nanoakışkan tipi, nanoakışkanın hacim fraksiyonu ve Reynolds sayısıdır. Üç farklı k- ve dört farklı k- türbülans modeli kullanılmıştır. Nanoakışkan olarak alüminyum oksit Al2O3-su ve bakır oksit CuO-su kullanılmıştır. Kullanılan nanopartiküllerin hacim fraksiyonları %0, %0,1, %0,5, %1, %2 ve %4'tür. Reynolds sayısı 3×103 'den 50×103 'e değişmektedir. Sonuçlar, düşük Reynolds düzeltmeli k-ω standart türbülans modelinin daha iyi sonuç verdiğini göstermiştir. Nanoakışkanın hem tipinin hem de hacim fraksiyonunun ısı transferini ve basınç düşüşünü etkilediği görülmüştür. Su içerisinde Al2O3 ve CuO nanoparçacıklarının kullanılması ısıl performansı artırmıştır. CuO-su nanoakışkan performans faktörünün Al2O3-su nanoakışkanınkinden daha iyi olduğu görülmüştür. Dairesel kesitli kanallar için türetilen türbülanslı tam gelişmiş akış korelasyonlarının iki boyutlu dikdörtgen kanallar için kullanılmasının yanlış sonuçlar verebileceği görülmüştür.

The effect of turbulence model and nanofluid on fluid flow and heat transfer in a narrow rectangular duct

The effect of type of turbulence model and nanofluid on the heat transfer and fluid flow in a horizontal narrow rectangular duct isnumerically studied under constant wall heat flux boundary condition. Numerical study is carried out using ANSYS Fluent 17.0software. Examined parameters are the type of turbulence model, the type of nanofluid, the volume fraction of nanoparticle innanofluid, and the Reynolds number. Three different k- and four different k- turbulence models are employed. Aluminum oxideAl2O3-water and copper oxide CuO-water are used as nanofluids. Volume fractions of nanoparticles used are 0%, 0.1%, 0.5%, 1%,2% and 4%. Reynolds number changes from 3×103to 50×103. Results showed that k-ω standard turbulence model with lowReynolds number correction gives better result. It is seen that both the type and the volume fraction of nanoparticle in nanofluidaffect heat transfer and pressure drop. Using Al2O3 and CuO nanoparticles in water increases thermal performance. It is found thatthe performance factor of CuO-water nanofluid is better than that of Al2O3-water nanofluid. It is seen that using turbulent fullydeveloped flow correlations derived for circular ducts may end up with incorrect results for the flow in two-dimensional rectangularduct.

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