Farklı parametreler için nanoakışkanlar ve çarpan jetlerin müşterek etkisinin sayısal incelenmesi

Yıl 2019, , 1501 - 1516, 29.05.2019

Mustafa Kılıç , Okan Özcan

https://doi.org/10.17341/gazimmfd.460548

Cited By: 6

Öz

Bu çalışmada; nanoakışkanların çarpan akışkan jet tekniği ile kullanılarak, yüksek ısı akılı bir yüzeyden olan ısı transferinin iyileştirilmesi sayısal olarak incelenmiştir. Çalışmada, düz bir bakır yüzeyden gerçekleşen ısı transferi, farklı Reynolds sayıları (Re= 12000, 14000, 16000, 18000), farklı parçacık çapları (Dp=10nm, 20nm, 40nm, 80nm), farklı hacimsel oranlar (φ= %2, %4, %6, %8) ve farklı tiplerde hazırlanan nanoakışkanlar (CuO-Su, NiO-Su, Cu-Su, saf Su) için incelenmiştir. Çalışmada PHOENICS HAD programının düşük Reynolds sayılı k-ε türbülans modeli kullanılmıştır. Sonuç olarak; Re sayısının Re=12000-18000 değerine arttırılması sonucunda ortalama Nusselt sayısında %28 oranında bir artış olduğu belirlenmiştir. Nanoparçacıkların çap boyutu 80nm’den 10nm’ye azaltıldığında ortalama Nusselt sayısında %13,2 oranında bir artış olduğu tespit edilmiştir. Farklı hacimsel oranlarda hazırlanan naoakışkanlarda ise; hacimse oran %4 değerinden sonra arttırılsa dahi, ısı transferinde belirgin bir artışa sebep olmadığı belirlenmiştir. Farklı tiplerde hazırlanan nanoakışkanların kullanıldığı durumda en iyi ısı transferi performansı Cu-Su nanoakışkanı kullanıldığı durumda elde edilmiştir. Cu-Su nanoakışkanı saf su kullanıldığı duruma göre Nu_ort’da %8,3 oranında bir iyileştirme göstermiştir. Ayrıca; modellemede kullanılan düşük Reynolds sayılı k-ε türbülans modelinin sıcaklık dağılımını ve akış özelliklerini iyi şekilde temsil edebildiği görülmüştür. 

Anahtar Kelimeler

Çarpan akışkan jet, nanoakışkan; ısı transferi; hesaplamalı akışkanlar dinamiği;

Kaynakça

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