İçerisinde dairesel halkalar bulunan bir boruda nanoakışkanların pulsatif akışının ısı transferine etkisinin parametrik incelenmesi

Yıl 2018, Cilt: 24 Sayı: 4, 597 - 604, 17.08.2018

Selma Akçay , Ünal Akdağ

Öz

Bu
çalışmada, içerisine dairesel halkalar yerleştirilmiş olan bir boruda laminer
pulsatif akış giriş şartlarında nanoakışkanların ısı transferi ve sürtünme
faktörüne etkileri sayısal olarak incelenmiştir. Çalışmalarda korunum
denklemleri, FLUENT ANSYS 15.0 paket programı kullanılarak, tariflenen sınır
şartlar için sonlu hacim metodu (SHM) ile ayrıklaştırılmış ve SIMPLE
algoritması kullanılarak çözülmüştür. İlk olarak farklı Reynolds sayılarında ve
değişen partikül hacim oranlarındaki farklı nanoakışkan tiplerinin sürekli akış
şartlarında ısı transferine etkileri analiz edilmiştir. Daha sonra en iyi ısı
transferi sağlayan bu nanoakışkan parametreleri sabit tutularak
nanoakışkanların pulsatif akışının ısı transferine etkileri araştırılmıştır.
Farklı pulsatif parametreler için ortalama Nusselt sayısı ve ortalama sürtünme
faktörü hesaplanmıştır. Sayısal sonuçlar sürekli akış durumunda Reynolds
sayısının ve partikül hacim oranının artması ile ısı transferinin iyileştiğini
göstermiştir. Ayrıca nanoakışkanların pulsatif akışı durumunda pulsatif
parametrelerin artması ile sürtünme faktöründe bir miktar artış ile birlikte
ısı transferinde iyileşme sağlandığı gözlemlenmiştir. Elde edilen sonuçlar,
içerisinde dairesel halkalar bulunan bir boruda nanoakışkanların pulsatif
akışının ısı transferi iyileşmesinde önemli bir potansiyele sahip olduğunu
göstermiştir.

Anahtar Kelimeler

Nanoakışkan, Pulsatif akış, Dairesel halka, Isı transferi, Sayısal çalışma

Parametric investigation of effect on heat transfer of pulsating flow of nanofluids in a tube using circular rings

Öz

In
this study, the heat transfer characteristics and friction factor of nanofluids
under laminar pulsating inlet flow conditions in a tube with circular rings are
investigated numerically. In investigations, the governing equations are solved
with FLUENT ANSYS 15.0 package program, along with boundary conditions using
the finite volume approach (FVM) by SIMPLE algorithm. Firstly, the effects on
heat transfer of different nanofluid types with varying particle volume
fractions and Reynolds numbers under steady flow conditions are analyzed. Then,
these nanofluids parameters are kept constant and the effects on heat transfer
under pulsating flow conditions of nanofluids are investigated. The average
Nusselt number and friction factor are calculated for different pulsating
parameters. The numerical results indicate that the heat transfer performance
enhances with increase in particle volume fraction and Reynolds number in steady
regime. It is observed that the heat transfer performance increases with
increasing pulsating amplitude in pulsating nanofluid flow, and there is a
slightly increase in pressure drop. The computed results reveal that there is a
good potential in promoting the heat transfer enhancement by using the
nanoparticles under pulsating flow in a tube with circular rings.

Anahtar Kelimeler

Nanofluid, Pulsating flow, Circular ring, Heat transfer, Numerical study

Kaynakça

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