Correlation for cross-flow resistance coefficient using STAR-CCM+ simulation data for flow of water through rod bundle supported by spacer grid with split-type mixing vane

Cross-flow resistance coefficients were observed to be dependent not only on the ratio of lateral to axial flow velocity but also on the hydraulic diameter of the interconnected sub-channel with larger cross-section, the centroid to centroid distance and the gap width. The coefficient is also dependent on the dynamics of the flow in the neighborhood of specific gaps. These dynamics were attributed to the behavior of secondary flows in the sub-channels and especially across the gaps. Profiles of cross-flow resistant coefficient showed a decreasing trend as the ratio of lateral to axial flow velocity increased.