Abstract
Abstract An analytical method was developed to determine the theoretical effective conduction mixing length for subchannels in a hexagonal rod bundle. Calculational results showed that the effective mixing length is a strong function of the subchannel geometry and is not equal to the normally assumed centroid-to-centroid distance. A parametric study of COBRA-IIIC also indicated that significant errors can be generated in the temperature distribution if incorrect mixing lengths are used in subchannel calculations.
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