Boru demeti üzerinden geçen Al2O3- su nanoakışkanın pulsatif akışının ısı transferine etkisi

Year 2019, , 621 - 631, 20.06.2019

Selma Akcay , Ünal Akdağ , Oktay Hacıhafızoğu , Doğan Demiral

https://doi.org/10.24012/dumf.435490

Cited By: 4

Abstract

Bu
çalışmada, sabit duvar sıcaklığına sahip boru demetleri üzerinden geçen Al₂O₃-su
nanoakışkanın laminer pulsatif akışının ısı transferine ve sürtünme faktörüne
etkileri sayısal olarak incelenmiştir. Çalışmada, dairesel kesitli borular
kademeli olarak yerleştirilmiş ve analizler iki boyutlu olarak
gerçekleştirilmiştir. Kullanılan eşitlikler, sonlu hacimler metodu ile SIMPLE
algoritması kullanılarak çözülmüştür. Sayısal incelemelerde, nanoakışkan tipi
ve partikül hacim oranı sabit tutulmuş olup, analizler Reynolds sayısının sabit
bir değeri için pulsatif parametrelerin değiştirilmesi ile elde edilmiştir. Bu
parametrelerin ısı transferi karakteristiği ve sürtünme faktörü üzerindeki
etkileri daimi akış şartları ile karşılaştırılmıştır. Boru demeti üzerinden
pulsatif akışta anlık hız ve sıcaklık dağılımları elde edilmiştir. Sayısal
sonuçlar, ısı transferindeki iyileşmenin pulsatif parametrelerden oldukça
etkilendiğini göstermiştir. Pulsatif genlik ve frekans arttıkça ısı
transferinin de arttığı, ancak bu artışın sürtünme faktöründe de bir miktar
artışa sebep olduğu gözlemlenmiştir. Çalışma sonucunda boru demetleri üzerinden
nanoakışkanların pulsatif akışı için en iyi termo-hidrolik performansı sağlayan
parametreler belirlenmiştir. Sonuçlar boyutsuz parametrelerin bir fonksiyonu
olarak verilmiştir. 

Keywords

Boru demeti; Pulsatif akış; Nanoakışkanlar; Isı transferi; Sayısal çalışma

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