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Abstract
The objective of the present work is to investigate numerically the natural convection heat transfer between two horizontal concentric and isothermal cylinders. A mathematical model was constructed where the conservation equations governing the transfer of continuity, momentum and thermal energy together with their boundary conditions were solved using the patankar technique (22).
The study covered a wide range of the variable parameters where the rayleigh number was varied from 10 to 10, the radius ratio was changed between 1.25 and 10 and the prandtl number was also changed from 0.01 to 10.
The calculation grid used in the solution is investigated to determine the best grid spacing, the required number of iterations and other used parameters which affect the accuracy of the generated solutions. The numerical method and computer program were tested for the case of pure conduction to assure the validity and accuracy of the numerical method.