Implications concerning rod bundle crossflow mixing based on measurements of turbulent flow structure. Rowe, D. S., Johnson, B. M., & Knudsen, J. G. International Journal of Heat and Mass Transfer, 17(3):407–419, http://www.sciencedirect.com/science/article/pii/001793107490012X, 1974. ![Implications concerning rod bundle crossflow mixing based on measurements of turbulent flow structure [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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 1.25 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 increases the turbulence intensity, longitudinal macroscale, and the dominant frequency of turbulence. These turbulence parameters are rather insensitive to Reynolds number. 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. \textcopyright 1974.
@article{Rowe1974,
abstract = {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 1.25 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 increases the turbulence intensity, longitudinal macroscale, and the dominant frequency of turbulence. These turbulence parameters are rather insensitive to Reynolds number. 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. {\textcopyright} 1974.},
address = {http://www.sciencedirect.com/science/article/pii/001793107490012X},
author = {Rowe, D. S. and Johnson, B. M. and Knudsen, J. G.},
doi = {10.1016/0017-9310(74)90012-X},
issn = {00179310},
journal = {International Journal of Heat and Mass Transfer},
keywords = {Published},
mendeley-tags = {Published},
number = {3},
pages = {407--419},
title = {{Implications concerning rod bundle crossflow mixing based on measurements of turbulent flow structure}},
url = {http://dx.doi.org/10.1016/0017-9310(74)90012-X},
volume = {17},
year = {1974}
}
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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 increases the turbulence intensity, longitudinal macroscale, and the dominant frequency of turbulence. These turbulence parameters are rather insensitive to Reynolds number. 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. 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