Experimental Analysis of GO-Al2O3/Water Nanofluid in A Concentric Tube Heat Exchanger

Abstract

Heat exchangers are frequently used in many industrial applications such as heating and cooling systems. Increasing the thermal performance of heat exchangers, adding nano-sized particles to enhance thermophysical properties of the working fluid can be a good solution. Moreover, in recent years, it is seen that higher improvement in thermal performance of nanofluids obtained by utilizing two or more nanoparticles known as hybrid nanofluids. In this experimental work, it is aimed to increase the thermal efficiency of a tube heat exchanger by applying graphene oxide (GO) -aluminum oxide (Al2O3) /water hybrid nanofluid. In this context, GO-Al2O3/water hybrid nanofluid was tested in two different modes (parallel flow and cross flow) in the tubular heat exchanger and the results were compared. The concentration ratio of the GO-Al2O3/water hybrid nanofluid was chosen as 1%. The experimental results of this study proved that utilization of GO-Al2O3/water hybrid nanofluid in the heat exchanger significantly improved the thermal performance. In the system that GO-Al2O3/water hybrid nanofluid was used at 1% concentration, as increase of 9.8% and 10.7% were recorded in the total heat transfer coefficient in parallel and counter flow, respectively.

Keywords

• Tubular Heat Exchanger
• Nanofluid
• Hybrid
• Thermal Performance
• GO-Al2O3

Eş Merkezli İç İçe Borulu Isı Değiştiricisinde GO-Al2O3/Su Hibrit Nanoakışkanının Deneysel Analizi

Öz

Isı değiştiricileri, ısıtma ve soğutma sistemleri gibi birçok endüstriyel uygulamada sıklıkla kullanılmaktadır. Isı değiştiricilerin ısıl performanslarının arttırılması için, çalışma akışkanının termofiziksel özelliklerini iyileştirecek nano boyutlu parçacıklar eklenmesi iyi bir çözüm olabilir. Bunun yanında, son yıllarda hibrit nanoakışkanlar olarak bilinen iki veya daha fazla farklı nanopartikül kullanılarak elde edilen nanoakışkanların ısıl performanslarında daha yüksek iyileştirme elde edildiği görülmektedir. Bu deneysel çalışmada grafen oksit (GO) – alüminyum oksit (Al2O3)/su hibrit nanoakışkanı GO-Al2O3 /su hibrit nanoakışkan kullanılarak, borulu bir ısı değiştiricisinin termal veriminin arttırılması amaçlanmıştır. Bu kapsamda GO-Al2O3 /su hibrit nanoakışkanı, ısı değiştiricide iki farklı modda (paralel ve karşıt) olarak denenmiş ve sonuçlar karşılaştırılmıştır. Kullanılan GO-Al2O3 /su hibrit nanoakışkanının konsantrasyon oranı %1 olarak seçilmiştir. Bu çalışmanın deneysel sonuçları, ısı değiştiricide GO-Al2O3 /su hibrit nanoakışkanının kullanılmasının ısıl performansı önemli ölçüde iyileştirdiğini göstermiştir. GO-Al2O3 /su hibrit nanoakışkanının %1 konsantrasyon oranında kullanıldığı sistemde toplam ısı transfer katsayısında paralel ve karşıt akışlı durumda sırasıyla %9.8 ve %10.7 artış değerleri kaydedilmiştir.

Anahtar Kelimeler

• Borulu Isı Değiştirici
• Nanoakışkan
• Hibrit
• GO-Al2O3
• Termal Performans

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