Abstract
Based on our unsteady numerical simulations flow in subchannels, a new correlation of the peak frequency in terms of the Strouhal number and non-dimensional gap size was proposed. By substituting the proposed correlation for the existing theoretical correlation of the gap Stanton number, the gap Stanton numbers of high Prandtl number and low Prandtl number fluids were predicted more accurately than the same theoretical correlation with substituting other empirical correlations of the Strouhal number. Furthermore, the molecular diffusion term in the theoretical correlation of the gap Stanton number was improved by considering the flow pulsation. The improved correlation shows much more accurate predictability of the gap Stanton number of typical liquid metal than the original one.
