Theoretical analysis of the fluid mixing at the core inlet in rolling motion

The fluid mixing at the reactor core in rolling motion and steady state is investigated numerically with CFX12.0. The CFD results are validated with experimental data in steady state. In rolling motion, the fluid mixing factor at the center of the core oscillates in a cosine function, but the variation of the fluid mixing factor surrounding the core is not regular. The variation amplitude of the fluid mixing factor next to the boundary line of fluid mixing is the most significant. The variation of fluid mixing factor increases with the increasing of additional force. The increasing of Reynolds number could depress the effect of rolling motion on the fluid mixing.