Measurement of turbulent velocity, intensity and scale in rod bundle flow channels Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3197xq109

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  • An experimental study was performed to investigate the effect of flow channel geometry on fully developed turbulent flow in "clean" rod bundle flow channels. This information was sought to obtain a better understanding of crossflow mixing between rod bundle subchannels. The experiments were performed in water with a Reynolds number range from 50,000 to 200,000. The experimental flow models considered pitch-to-diameter ratios of 125 and 1.125. Axial components of velocity, turbulence intensity and Eulerian autocorrelation function were the primary measurements. The autocorrelation function provided an indication of the dominant frequency of turbulence and an estimate of the longitudinal macroscale by using Taylor's hypothesis. A limited amount of lateral component turbulence intensity data was also obtained. The experimental results show that rod gap spacing (pitch-to-diameter ratio) is the most significant geometric parameter affecting the flow structure. Decreasing the rod gap spacing increased the turbulence intensity, longitudinal macroscale, and the dominant frequency of turbulence. These turbulence parameters were found to be rather insensitive to Reynolds number. The turbulence parameters within a rod gap were found to be insensitive to the shape of adjacent subchannels and only slightly affected by the amount of lateral freedom allowed by the various size flow models. The results indicate that macroscopic flow processes exist adjacent to the rod gap. This includes secondary flows and increased scale and frequency of flow pulsations when the rod gap spacing is reduced. When interpreted in terms of crossflow mixing, the results are consistent with present crossflow mixing correlations.
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-01-29T16:06:19Z (GMT) No. of bitstreams: 1 Rowe_Donald Scott_1973.pdf: 2846909 bytes, checksum: f305b5aba2649e8ee528bae599ad0ac4 (MD5)
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