Farklı Çaplara Sahip Dairesel Borularda Grafen Oksit (GO)-Saf Su Nanoakışkanı Kullanımının Isı Transferi Artışı Üzerindeki Etkisinin Deneysel Olarak İncelenmesi

Year 2019, Volume: 11 Issue: 1, 282 - 301, 31.01.2019

Koray Karabulut , Ertan Buyruk Ferhat Kılınç

https://doi.org/10.29137/umagd.449657

Cited By: 3

Abstract

Bu çalışmada, %0,01 hacimsel konsantrasyonlu
grafen oksit (GO)-saf su nanoakışkanının taşınım ısı transferi ve basınç düşüşü
artışı iç çapları 12 mm ve 16 mm olan, 1830 mm uzunluğa sahip sabit duvar ısı
akılı dairesel bakır düz borularda deneysel olarak incelenmiştir. Ayrıca,
çalışmada sayısal hesaplamalar tek fazlı akışkan kabulüyle Navier-Stokes ve
enerji denkleminin sonlu hacimler yöntemi olan ANSYS-FLUENT programı
kullanılarak çözülmesiyle üç boyutlu ve zamandan bağımsız olarak yapılmıştır.
Hacimsel debinin, ısı akısının ve boru çapının GO-saf su nanoakışkanının
taşınım ısı transfer katsayısı ve basınç düşüşü üzerindeki etkileri deneysel
olarak araştırılmış ve saf su için elde edilen ısı taşınım katsayısı değerleri
ilgili bağıntılardan elde edilen sonuçlarla karşılaştırılmıştır. Sonuçlar,
farklı çaplı borular için farklı debi ve ısı akısı değerlerinde ısı taşınım
katsayısı ve Nusselt sayısı değerlerinin değişimleri olarak sunulmuş ve ayrıca
boruların duvar yüzey sıcaklık ve ısı taşınım katsayısı değerlerinin
değişimleri sayısal ve deneysel karşılaştırmalı olarak incelenmiştir. Elde
edilen sonuçlar, nanoakışkanın h ve Nu sayısı değerlerinin hacimsel debi ve ısı
akısındaki artışla arttığını ve en yüksek artış değerlerine 16 mm iç çaplı
boruda ulaşıldığını göstermektedir. 16 mm iç çaplı boru için GO-saf su
nanoakışkanının ortalama ısı taşınım katsayısı artış değeri 1,5 L/dak.’ lık
debi (Re=1981) ve 3043,94 W/m²‘ lik 
(350 W) ısı akısı değerinde %34,88 olmaktadır. 

Keywords

Nanoakışkan, grafen oksit, taşınım ısı transfer katsayısı, basınç düşüşü

Experimental Investigation of the Effect of Graphene Oxide (GO)-Distilled Water Nanofluid Usage on Heat Transfer Increment In Circular Tubes Having Different Diameters

Abstract

In this study, increment of convective heat
transfer and pressure drop of graphene oxide (GO)-distilled water nanofluid
with volumetric concentration of 0,01% in circular copper straight tubes having
inner diameters of 12 mm and 16 mm, length of 1830 mm and with constant wall
heat flux was experimentally investigated. 
In addition, numerical calculations were performed as three-dimensional
and steady by solving Navier-Stokes and energy equation using ANSYS-FLUENT
program which is the finite volumes method with the assuming of single phase
fluid. The effects of volumetric flow rate, heat flux and diameter of the tube
were experimentally researched on the convective heat transfer coefficient and
the pressure drop of the GO-distilled water nanofluid and the obtained values
of convective heat transfer coefficient for the distilled water were compared
with determined results from corresponding correlations. Results were presented
as the variation of convective heat transfer coefficient and Nu number values
at the values of different flow rates and heat fluxes for different tube
diameters. And also, the variations of wall surface temperature and convective
heat transfer coefficient values of the tubes were examined as numerical and
experimental comparison. The obtained results showed that h and Nusselt number
values of nanofluid increased with increasing of volumetric flow rate and heat
flux and the highest increment values were reached at the pipe with 16 mm inner
diameter. The increment value of average convective heat transfer coefficient
of the GO-distilled water nanofluid was 34,88% at the flow rate of 1,5 L/min.
(Re=1981) and the heat flux of 3043,94 W/m2 (350 W) for the tube with 16 mm
inner diameter.

Keywords

Nanofluid, graphen oxide, convective heat transfer coefficient, pressure drop

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