Contribution of large-scale coherent structures towards the cross flow in two interconnected channels. Mahmood, A., Rohde, M., van der Hagen, T., & Mudde, R., F. In The 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13), pages 1-12, 2009.
abstract   bibtex   
Single phase cross flow through a gap region joining two vertical channels has been investigated experimentally for Reynolds numbers, based on the channels hydraulic diameter, ranging from 850 to 21000. The flow field in the gap region is investigated by 2D-PIV and the inter channel mass transfer is quantified by the tracer injection method. Experiments carried out for variable gap heights and shape show the existence of a street of large-scale counter rotating vortices on either side of the channel-gap interface, resulting from the mean velocity gradient in the gap and the main channel region. The appearance of the coherent vortices is subject to a threshold associated with the difference between the maximum and the minimum average stream wise velocities in the channel and the gap region, respectively. The auto power spectral density of the cross velocity component in the gap region exhibits a slope of -3 in the inertial range, indicating the 2D nature of these vortices. The presence of the large-scale vortices enhances the mass transfer through the gap region by approximately 63% of the mass transferred by turbulent mixing alone. The inter-channel mass transfer, due to cross flow, is found to be dependent not only on the large-scale vortices characteristics, but also on the gap geometry.
@inproceedings{
 title = {Contribution of large-scale coherent structures towards the cross flow in two interconnected channels},
 type = {inproceedings},
 year = {2009},
 keywords = {PIV,coherent structures,crossflow},
 pages = {1-12},
 city = {Kanazawa, Japan LB  - Mahmood:2009aa},
 id = {1d15983c-fdee-397d-998b-a773004bf386},
 created = {2018-06-29T18:31:10.027Z},
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 last_modified = {2018-10-02T09:30:06.211Z},
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 citation_key = {Mahmood2009},
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 abstract = {Single phase cross flow through a gap region joining two vertical channels has been investigated experimentally for Reynolds numbers, based on the channels hydraulic diameter, ranging from 850 to 21000. The flow field in the gap region is investigated by 2D-PIV and the inter channel mass transfer is quantified by the tracer injection method. Experiments carried out for variable gap heights and shape show the existence of a street of large-scale counter rotating vortices on either side of the channel-gap interface, resulting from the mean velocity gradient in the gap and the main channel region. The appearance of the coherent vortices is subject to a threshold associated with the difference between the maximum and the minimum average stream wise velocities in the channel and the gap region, respectively. The auto power spectral density of the cross velocity component in the gap region exhibits a slope of -3 in the inertial range, indicating the 2D nature of these vortices. The presence of the large-scale vortices enhances the mass transfer through the gap region by approximately 63% of the mass transferred by turbulent mixing alone. The inter-channel mass transfer, due to cross flow, is found to be dependent not only on the large-scale vortices characteristics, but also on the gap geometry.},
 bibtype = {inproceedings},
 author = {Mahmood, A. and Rohde, M. and van der Hagen, T.H.J.J. and Mudde, R. F.},
 booktitle = {The 13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13)}
}

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