Three-dimensional natural convection in a horizontal cylinder subject to mixed boundary conditions
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Natural convection plays a pivotal role in the overall energy transfer in solar collectors, thermal energy storage systems, nuclear spent fuel cooling with emphasis on the design of shipping casks for the transportation of fuel rods, cooling of electronic equipment, and in inert-gas insulated electrical cables. Numerous studies, both numerical and experimental, have been performed on natural convective heat transfer and fluid flow. In this paper, results of numerical simulations of steady, laminar 3-D natural convection around a square rod placed concentrically in a horizontal cylinder are presented. This problem models the fluid dynamics and heat transfer in a nuclear spent fuel shipping cask in which the inner body represents a light water reactor (LWR) fuel assembly. Throughout this study, the inner and outer boundaries are maintained at constant heat flux and isothermal conditions, respectively. The end boundaries are maintained at adiabatic conditions.