Mehmet Fahri SARAÇ, Kerim YAPICI, Seçil PEKER

PARÇACIK BOYUTUNA BAĞLI FÜME SİLİKA BAZLI KESME İLE KALINLAŞAN AKIŞKANLARIN REOLOJİK DAVRANIŞI

Üç farklı ortalama parçacık boyutuna sahip (8, 12 ve 18nm) füme silikaların PEG200 taban akışkanına dört farklı kütlesel fraksiyon aralığında (%5, 10 ,15 ve 20) dağıtılması ile elde edilen süspansiyon akışkanların reolojik (viskozite, kritik kesme hızı, depolama modülü ve kayıp modülleri) davranışları incelenmiştir. Doğrusal ve doğrusal olmayan viskoelastik ölçümlerden elde edilen bulgular da, kütlece %5 fraksiyonda hazırlanan süspansiyonların Newton kuralına uyduğunu ayrıca artan fraksiyona bağlı olarak viskoziteninde arttığı gözlemlenmiştir. Düşük kütlesel fraksiyonlarda nanoparçacık boyutu ile kaymadan dolayı viskozite kalınlaşmasına etki ettiği gözlemlenirken, kütlesel fraksiyon artışı ile bu etkinin azaldığı da görülmüştür. Ayrıca tüm parçacık boyutu ve fraksiyonlarda depolama ve kayıp modulüslerinin salınım gerilimleri incelendiğinde süspansiyonların viskoz davranış özelliği göstermiştir. Bu bulgular daha güçlü ve hafif kesme ile kalınlaşan süspansiyonların hazırlanmasını ve balistik esaslı çalışmalarda kullanılması açısından önem arz etmektedir.

Anahtar Kelimeler:

Füme silika, Nanoakışkan, Reoloji, Polietilen glikol

RHEOLOGICAL BEHAVIOR OF PARTICLE SIZE DEPENDENT FUMED SILICA BASED SHEAR THICKENING FLUIDS

The rheological properties (viscosity, critical shear rate, storage modulus and loss modulus) of suspension fluids produced by dispersing fume silicates with three different mean particle sizes (8, 12 and 18 nm) in PEG200 base fluid at four different fractional ranges (5, 10, 15 and 20%) were investigated. In the findings obtained from linear and nonlinear viscoelastic measurements, it was observed that the suspensions prepared in 5% fraction increased in viscosity due to increasing fraction. It is observed that in low mass fractions the nanoparticle size affects the viscosity thickening due to the slip, this effect leads to be reduced by the increase of the mass fraction. Furthermore, when the storage modulus / loss modulus vs strain in all particle sizes and fractions were examined, it was observed that for all suspensions have viscous behavior characteristics. This findings are important for the preparation of suspensions with stronger and light-weight shear thickening fluids and for use in ballistic related works.

Keywords:

Fumed silica, Polyethylene glycol, Nanofluid, Rheology,

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