Laboratory Experiments were conducted to determine the amount of mixing that occurs between two interconnected flow channels during boiling. The experiments were performed with water at 900 psia flowing through electrically heated test sec¬tions that simulated two adjacent channels typical of a 19-rod bundle. The results of the experiments showed that mixing dur¬ing nonboiling conditions was nearly independent of rod spacing and could be correlated as a function of Reynolds Number. The results also showed that mixing during boiling is not necessar¬ily higher than during nonboiling conditions. Mixing during boiling was found to be dependent upon rod spacing, flow rate, and, possibly, steam quality. The results also agreed well with predictions of the computer program COBRA which was devel¬oped in the first part of this study to compute flow, enthalpy and pressure in rod bundle subchannels.
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