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Title

EFFECTS OF AN ENCLOUSURE INCLINATION ANGLE AND IT’S WALLS MOVEMENT DIRECTION ON VARIABLE PROPERTIES NANOFLUID MIXED CONVECTION

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 Start Page 1 | End Page 3

Abstract

 In this paper, the effects of INCLINATION ANGLE and two different cases of movement direction of top and bottom walls of an enclosure on the nano fluid mixed convection have been investigated. In the first case, the natural and forced convection effects are in agreement, whereas in the second case they are opposed. Simulations have been performed for the temperature dependent as well as the temperature independent thermal conductivity and viscosity of water-Al2O3 nano fluid. The volume fractions of nanoparticles between 0 and 0.08 and the INCLINATION ANGLE of the cavity between 0 and 90° have been considered. To solve the governing equations, the SIMPLE algorithm and a finite volume based method have been used. The results show that by increasing the enclosure INCLINATION ANGLE, which enhances the forced convection, the three convective cells, observed at low INCLINATION ANGLEs, change to one cell. The trend for change of average Nusselt number with increasing volume fraction is different for the temperature independent cases compared to that of the temperature dependen t cases. Therefore, in order to obtain accurate simulation results, the temperature dependency of the properties should be considered.

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