Journal
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
Volume 70, Issue 10, Pages 1141-1156Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10407782.2016.1230423
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In the present paper, natural convection in an annulus between two confocal elliptic cylinders filled with a Cu-Al2O3/water hybrid nanofluid is investigated numerically. The inner cylinder is heated at a constant surface temperature while the outer wall is isothermally cooled. The basic equations are formulated in elliptic coordinates and developed in terms of the vorticity-stream function formulation using the dimensionless form for 2D, laminar and incompressible flow under steady-state condition. The governing equations are discretized using the finite volume method and solved by an in-house FORTRAN code. Numerical simulations are performed for various volume fractions of nanoparticles (0 <= phi <= 0.12) and Rayleigh numbers (10(3) <= Ra <= 3 x 10(5)). The eccentricity of the inner and outer ellipses and the angle of orientation are fixed at e(1) = 0.9, e(2) = 0.6 and gamma = 0 degrees respectively. It is found that employing a Cu-Al2O3/water hybrid nanofluid is more efficient in heat transfer rate compared to the similar Al2O3/water nanofluid.
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