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At present the ENERGY model contains a correlated swirl flow that is circumferentially and axially constant. This report evaluates the need to include a variable swirl flow forcing function in this model. A suitable function for testing the , variable swirl flow effects is obtained by reducing the existing world transverse flow experimental data, relying heavily on the MIT laser doppler anemometer data. A comparison of the existing constant swirl model with the variable swirl model using t'le resulting forcing function is made with the help of a few sample problems. These sample problems help to highlight the physical differences between the two swirl models. By evaluating these differences, the report, concludes that in general, the variable swirl model implementation is not warranted. A discussion of when and how to use the variable nwirl n;odel if desired, is also included.

This project principally undertook the investigation of the thermal hydraulic performance of wire wrapped fuel bundles of LMFBR configuration. Results obtained included phenoraenological models for friction factors, flow split and mixing characteristics; correlations for predicting these characteristics suitable for insertion in design codes; numerical codes for analyzing bundle behavior both of the lumped subchannel and distributed parameter categories and experimental techniques for pressure velocity, flow split, salt conductivity and temperature measurement in water cooled mockups of bundles and subchannels. Flow regimes investigated included laminar, transition and turbulent flow under forced convection and mixed convection conditions. Forced convections conditions were emphasized. Continuing efforts are underway at MIT to complete the investigation of the mixed convection regime initiated here. A number of investigations on outlet plenum behavior were also made. The reports of these investigations are identified.

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