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

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

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.

Keywords:

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

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