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Natural convection in a cylinder with an internally slotted annulus wassolved by SIMPLE algorithm, and the effects of different slotted structures onnonlinear characteristics of natural convection were investigated. The resultsshow that the equivalent thermal conductivity Keq increases with Rayleighnumber, and reaches the maximum in the vertical orientation. Nonlinear resultswere obtained by simulating the fluid flow at different conditions. Withincreasing Rayleigh number, heat transfer is intensified and the state of heattransfer changes from the steady to unsteady. We investigated different slottedstructures effects on natural convection, and analyze the correspondingnonlinear characteristics.

Effects of Slotted Structures on Nonlinear Characteristics of Natural Convection in a Cylinder with an Internal Concentric Slotted Annulus