Abstract
In the subchannel analysis of rod bundles, the mass exchange between adjacent subchannels is quantified by mixing coefficients, or mixing factors. This process of turbulent cross-flow mixing was found to be related to the phenomenon of quasi-periodic “flow pulsations” across the gaps between adjacent subchannels. By means of hot-wire measurements of spectra of the components of the turbulent fluctuating velocities in the gap regions and a phenomenological model for the flow pulsations, mixing factors were determined for several four-rod bundles with different aspect ratios ( P/ D, W/ D). Comparison of the results with the literature shows good agreement. A correlation for the mixing factor as a function of the dimensionless gap width, obtained by linear regression of the new data, is proposed.
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