An experimental study on the identification of flow patterns responsible for crossflow in a vertical tube bundle geometry. Mahmood, a., Rohde, M., Van der Hagen, T., Mudde, R., F., & Ikeno, T. In Nureth-14, pages 1-12, 2011. Canadian Nuclear Society. abstract bibtex The aim of the present study is to enhance the current understanding of crossflow in a vertical tube bundle geometry in an experimental way. LDA measurements were carried out in a 4 x 4 tube bundle having diameter to pitch ratio of 0.7 for Reynolds numbers ranging approximately from 600 to 11,000. Water was used as a working fluid at isothermal, single-phase flow and ambient operating conditions. The experimental results showed the existence of large-scale coherent structures for laminar, transitional and turbulent flows. The secondary flow patterns were resolved as well. A comparison of the root mean square of cross velocity fluctuations in the gap region, being a measure of cross-flow, with the magnitude of the secondary flows reveals a dominant contribution of the former over the latter. Furthermore, the successful use of FEP in the above-mentioned experiments as solid, refractive index matching material in water has been demonstrated.
@inproceedings{
title = {An experimental study on the identification of flow patterns responsible for crossflow in a vertical tube bundle geometry},
type = {inproceedings},
year = {2011},
pages = {1-12},
publisher = {Canadian Nuclear Society},
city = {Toronto, Canada LB - Mahmood:2011aa},
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last_modified = {2018-10-02T09:30:06.330Z},
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abstract = {The aim of the present study is to enhance the current understanding of crossflow in a vertical tube bundle geometry in an experimental way. LDA measurements were carried out in a 4 x 4 tube bundle having diameter to pitch ratio of 0.7 for Reynolds numbers ranging approximately from 600 to 11,000. Water was used as a working fluid at isothermal, single-phase flow and ambient operating conditions. The experimental results showed the existence of large-scale coherent structures for laminar, transitional and turbulent flows. The secondary flow patterns were resolved as well. A comparison of the root mean square of cross velocity fluctuations in the gap region, being a measure of cross-flow, with the magnitude of the secondary flows reveals a dominant contribution of the former over the latter. Furthermore, the successful use of FEP in the above-mentioned experiments as solid, refractive index matching material in water has been demonstrated. },
bibtype = {inproceedings},
author = {Mahmood, a and Rohde, M and Van der Hagen, T.H.J.J. and Mudde, R F and Ikeno, T},
booktitle = {Nureth-14}
}
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