Numerical Modeling of Heat Transfer in Cylindrical Annulus: Aspect Ratio Effect

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A numerical study of the convective flow of water between two coaxial cylinders where the inner cylinder generates a constant heat source is made. The outer cylinder is cold while the lower and upper walls are adiabatic. Finite volume method and SIMPLER algorithm are used. The results are obtained and presented in the form of isothermal contours, current lines and average Nusselt number for a laminar flow and inclination angle in a cylindrical annulus of different aspect ratios. The results show that the heat transfer depends on the inclination angle and the aspect ratio. The best heat transfer is defined for the aspect ratio Ar = 2 while the weak heat transfer corresponds to the same aspect ratio but for a tilt angle of 0 °.

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