THREE-DIMENSIONAL CFD MODELING OF TiO2/R134a NANOREFRIGERANT

Main Article Content

Kamil ARSLAN

Abstract

In this study, numerical investigations were carried out for R134a based  TiO2 nanorefrigerants. Forced laminar flow and heat transfer of nanorefrigerants in a horizontal smooth circular cross-sectioned duct were investigated under steady-state condition. The nanorefrigerants consist of TiO2 nanoparticles suspended in R134a as a base fluid with four particle volume fractions of 0.8, 2.0 and 4.0%. Numerical studies were performed under laminar flow conditions where Reynolds numbers  range from 8×102  to 2.2×103. Flow is flowing in the duct with hydrodynamically and thermally developing (simultaneously developing flow) condition. The uniform surface heat flux with uniform peripheral wall heat flux (H2) boundary condition  was applied on the duct wall. Commercial CFD software, Ansys Fluent 14.5, was used to carry out the numerical study. Effect of nanoparticle volume fraction on the average convective heat transfer coefficient and average Darcy friction factor were analyzed. It is obtained in this study that increasing nanoparticle volume fraction of nanorefrigerant increases the convective heat transfer in the duct; however, increasing nanoparticle volume fraction does not influence the pressure drop in the duct.  The  velocity and temperature distribution in the duct for different Reynolds numbers and nanoparticle volume fractions were presented.

Article Details

How to Cite
ARSLAN, Kamil. THREE-DIMENSIONAL CFD MODELING OF TiO2/R134a NANOREFRIGERANT. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/2072>. Date accessed: 26 sep. 2017. doi: https://doi.org/10.2298/TSCI140425002A.
Section
Articles
Received 2017-03-01
Accepted 2017-03-13
Published 2017-03-13

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