Abstract
The experimental data on natural mixing between subchannels of rod bundles by turbulent interchange are reviewed. The main features of the structure of turbulence in subchannels of rod bundles are discussed. It can be concluded that cyclic and almost periodic flow pulsations through the gaps of rod bundles are the reason for the observed mixing rates through the gaps which are relatively independent of the gap width. A simple correlation of a mixing factor is developed which may be used as a good approximation for any gap geometry.
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