Lateral flow fields in four subchannels of a model rod bundle fuel assembly are experimentally measured using particle image velocimetry. Vanes (split-vane pairs) are located on the downstream edge of the support grids in the rod bundle fuel assembly and generate swirling flow. Measurements are acquired at a nominal Reynolds number of 28,000 and for seven streamwise locations ranging from 1.4 to 17.0 hydraulic diameters downstream of the grid. The streamwise development of the lateral flow field is divided into two regions based on the lateral flow structure. In Region I, multiple vortices are present in the flow field and vortex interactions occur. Either a single circular vortex or a hairpin shaped flow structure is formed in Region II. Lateral kinetic energy, maximum lateral velocity, centroid of vorticity, radial profiles of azimuthal velocity, and angular momentum are employed as measures of the streamwise development of the lateral flow field. The particle image velocimetry measurements of the present study are compared with laser Doppler velocimetry measurements taken for the identical support grids and flow condition.
Mapping of the Lateral Flow Field in Typical Subchannels of a Support Grid With Vanes
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division Dec. 17, 2002, revised manuscript received June 23, 2003. Associate Editor: A. K. Prasad.
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McClusky , H. L., Holloway , M. V., Conover , T. A., Beasley, D. E., Conner , M. E., and Smith , L. D., III (January 12, 2004). "Mapping of the Lateral Flow Field in Typical Subchannels of a Support Grid With Vanes ." ASME. J. Fluids Eng. November 2003; 125(6): 987–996. https://doi.org/10.1115/1.1625688
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