An Experimental Study on the Identification of Flow Patterns Responsible for Crossflow in a Vertical Tube Bundle Geometry
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A13-1 Coherent Large Scale Structures in the Gaps of Rod-Bundles

Amer Mahmood (Delft University of Technology)
Martin Rohde (Delft University of Technology)
Tim Van Der Hagen (Delft University of Technology)
Rob F. Mudde (Delft University of Technology)
Tsutomu Ikeno (Nuclear Fuel Industries, Ltd)


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.

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