Uğur KARAKAYA, Metin GÜRÜ, Adnan SÖZEN, Duygu Y. AYDIN, İbrahim Ethem BİLİCİ

Nano Mineralojik Akışkanların Termofiziksel Özelliklerinin Deneysel Olarak İncelenmesi

Bu çalışmada bentonit, diatomit, sepiyolit ve klinoptilolit malzemeleri içeren nanoakışkanların termofiziksel özellikleri belirlenmiştir. Spex tipi yüksek enerjili öğütücü kullanılarak 50 nm boyutunda nano parçacıklar üretilmiştir. Bu nano parçacıklar kullanılarak kütlece % 2 mineralojik malzeme ve kütlece % 0,5 Sodyum Dodesil Benzen Sülfonat içeren nanoakışkanlar 5 saat ultrasonik karıştırma sonucunda hazırlanmıştır. Termofiziksel özelliklerden olan ısıl iletkenlik, özgül ısı ve viskozite ölçümleri deneysel olarak gerçekleştirilmiştir. Mineral nanoakışkanlar içerisinde en büyük ısıl iletkenlik ve özgül ısı artışının bentonit içeren nanoakışkan ile elde edilmiştir. Bentonit içeren naoakışkanın askıda bulunan nano parçacık miktarının daha fazla olması nedeniyle diğer mineralojik nanaoakışkanlara göre ısıl iletkenlik ve özgül ısı diğerlerinin daha yüksek olduğu sonucuna varılmıştıır. Nanoakışkanlar içerisinde bulunan nano parçacıkların oluşturduğu parçacık-parçacık etkileşimi nedeniyle akışa karşı oluşan direncin arttığı, sonuç olarak saf suya kıyasla viskozitenin arttığı gözlemlenmiştir.

Anahtar Kelimeler:

Nanoakışkan, özgül ısı, ısıl iletkenlik

Experimental Investigation of Thermophysical Properties of Nano Mineralogical Fluids

In this study, the thermophysical properties of nanoparticles containing bentonite, diatomite, sepiolite and clinoptilolite materials were determined. Nano particles with a size of 50 nm were produced using a Spex type high-energy mill. Using these nanoparticles, nanoparticles containing 2% mineralogical material and 0.5% Sodium Dodecyl Benzene Sulfonate by mass were prepared by ultrasonic mixing for 5 hours. The thermal conductivity, specific heat and viscosity measurements from thermophysical properties have been experimentally measured. The greatest thermal conductivity and specific heat increase in the mineral nano-powders were obtained with the bentonite-containing nanofluid. It is concluded that the nano flux containing bentonite has higher thermal conductivity and specific heat than the other mineralogical nano-fluids because the amount of suspended nano particles is higher. It has been observed that the resistance to flow increases due to the particle-particle interaction generated by the nanoparticles in the nanofluids, resulting in an increase in viscosity compared to pure water.

Keywords:

nanofluids, specific heat, thermal conductivity,

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