THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Hamed Safikhani

,

Abbas Abbassi

,

Mohammad Kalteh

NUMERICAL SIMULATION AND PARAMETRIC STUDY OF LAMINAR MIXED CONVECTION NANOFLUID FLOW IN FLAT TUBES USING TWO PHASE MIXTURE MODEL

ABSTRACT
In this article, the laminar mixed convection of Al2O3-Water nanofluid flow in a horizontal flat tube has been numerically simulated. The two-phase mixture model has been employed to solve the nanofluid flow, and constant heat flux has been considered as the wall boundary condition. The effects of different and important parameters such as the Reynolds number (Re), Grashof number (Gr), nanoparticles volume fraction (Φ) and nanoparticle diameter (dp) on the thermal and hydrodynamic performances of nanofluid flow have been analyzed. The results of numerical simulation were compared with similar existing data and good agreement is observed between them. It will be demonstrated that the Nusselt number (Nu) and the friction factor (Cf) are different for each of the upper, lower, left and right walls of the flat tube. The increase of Re, Gr and f and the reduction of dp lead to the increase of Nu. Similarly, the increase of Re and f results in the increase of Cf. Therefore, the best way to increase the amount of heat transfer in flat tubes using nanofluids is to increase the Gr and reduce the dp.
KEYWORDS
mixed convection, nanofluid, flat tube, parametric study, mixture model
PAPER SUBMITTED: 2013-04-15
PAPER REVISED: 2013-09-14
PAPER ACCEPTED: 2013-12-03
PUBLISHED ONLINE: 2014-02-09
DOI REFERENCE: https://doi.org/10.2298/TSCI130415008S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 2, PAGES [415 - 428]
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Numerical simulation and parametric study of laminar mixed convection nanofluid flow in flat tubes using two phase mixture model

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