Laminar Flow and Heat Transfer of Water-γAl2O3 and Ethylene Glycol-γAl2O3 Mixture in Square Duct (original) (raw)

2014

Abstract

The present study focuses on the effect of nanofluid for heat transfer on laminar forced convection internal flow. Square duct with constant wall temperature is considered, and newtonian fluid model for fully hydrodynamically and thermally developed flow is applied. Variable thermophysical properties for the fluid and negligible viscous dissipation are assumed. The numerical solution of the problem is based on the finite volume method for quadrilaterals unstructured mesh. In this scheme, based on the integration around the polygonal control volume, the derivatives of the flow equations must be converted into closed line integrals using similar formulation of the Stokes theorem. The profiles of velocity and temperature are determined, the friction factors and the Nusselt number are predicted for different nanoparticle concentration (0 ≤ φ ≥ 10%) for both nanofluids (Water-γAl2O3 and Ethylene Glycol-γAl2O3). The results show that the average velocity decreases and the friction factor increases when the nanoparticle concentration rises. The use of a nanofluid has a beneficial effect on the heat transfer. The results obtained have clearly revealed that the inclusion of nanoparticles has produced a considerable improvement of the heat transfer, which clearly becomes important with an augmentation of the particle concentration. The solution method is verified for absence of the nanoparticle concentration case.

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