1. Modeling of forced convective heat transfer of a non-Newtonian nanofluid in the horizontal tube under constant heat flux with computational fluid dynamics
- Author
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Moraveji, Mostafa Keshavarz, Haddad, Seyyed Mohammad Hossein, and Darabi, Mehdi
- Subjects
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HEAT convection , *MATHEMATICAL models , *HEAT transfer , *COMPUTATIONAL fluid dynamics , *HEAT flux , *NON-Newtonian fluids , *TUBES , *AQUEOUS solutions , *PARTICLE size distribution - Abstract
Abstract: In this paper, convective heat transfer effect on the non-Newtonian nanofluid flow in the horizontal tube with constant heat flux was investigated using computational fluid dynamics (CFD). For this purpose, non-Newtonian nanofluid containing Al2O3 and Xanthan aqueous solution as a liquid single phase with two average particle sizes of 45 and 150nm and four particle concentrations of 1, 2, 4 and 6wt.% and two concentrations of Xanthan aqueous solutions (0.6,1.0wt.%) were used. Effect of particle size and concentration of Xanthan solution on convective heat transfer coefficient was investigated in different Reynolds numbers (500< Re <2500) for various axial locations of tube. The results showed that heat transfer coefficient and Nu number of non-Newtonian nanofluid increased with increasing concentration of Xanthan solution. By applying the modeling results, an equation was obtained for Nusselt number prediction using the dimensionless numbers. The results showed that the correlated data were in very good agreement with predicted data. The maximum error was around 5%. [Copyright &y& Elsevier]
- Published
- 2012
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