An experimental investigation on the use of FEP as refractive index matching material for LDA in a rod bundle flow. van Campen, L., J., A., M. In NUTHOS-7, pages 119, 2009. abstract bibtex The fluid flow inside a light water nuclear reactor is characterised by cross flow, a motion of the fluid perpendicular to the streamwise direction. Experimental investigations of flow in such a rod bundle geometry are limited by the optical access to the flow regions of interest. In this thesis an experimental technique is shown, which allows optical access with LDA to a rod bundle geometry, which are rectangular arrayed rods surrounded by the flow, such that subchannels are formed. Fluorinated Ethylene Propylene (FEP) is used as refractive index matching material. Its refractive index is determined to be 1.341 (water: 1.338) and its absorption coefficient λ for green (488.0 nm) light is measured to be -3.5 m−1 and for blue (514.5 nm) light λ = -2.6 m−1. A turbulent (Re = 5500), single phase flow in a pipe with 1.5 mm thick FEP walls was investigated. The results showed good agreement with literature data and measurements at a distance of y+ = 1 (0.02mm) could be obtained, proving the possibilities of FEP as refractive indexmatchingmaterial. A gravity driven vertical rod bundle flow loop with 3 × 3 subchannels, a subchannel is the free space in between 4 rods, and a diameter to pitch ratio of 0.7 was constructed. The FEP placed in the measurement section was shaped using a heat shrinking technique and attached by clamping. The fluid velocity could be measured across the complete cross section. Differences in streamwise and horizontal flow for laminar (Reb = 500) and turbulent (Reb = 9100) regime compared with literature data were found, which is attributed to the rod bundle setup that differs from the simulated geometry. The horizontal velocity components found were up to 10 times larger than expected, most likely caused by momentum transfer from the obliqueness of the rods in the vertical direction. The maximum possible sampling frequency depended strong on the number and thickness of FEP layers between the measurement volume and the probe. The shortest measurement distance from the wall was y+ = 1 (0.06 mm). The results indicate that the size of the LDA measurement volume limits this distance.
@inproceedings{
title = {An experimental investigation on the use of FEP as refractive index matching material for LDA in a rod bundle flow},
type = {inproceedings},
year = {2009},
pages = {119},
city = {Seoul, South-Korea LB - Van-Campen:2008aa},
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abstract = {The fluid flow inside a light water nuclear reactor is characterised by cross flow, a motion of the fluid perpendicular to the streamwise direction. Experimental investigations of flow in such a rod bundle geometry are limited by the optical access to the flow regions of interest. In this thesis an experimental technique is shown, which allows optical access with LDA to a rod bundle geometry, which are rectangular arrayed rods surrounded by the flow, such that subchannels are formed. Fluorinated Ethylene Propylene (FEP) is used as refractive index matching material. Its refractive index is determined to be 1.341 (water: 1.338) and its absorption coefficient λ for green (488.0 nm) light is measured to be -3.5 m−1 and for blue (514.5 nm) light λ = -2.6 m−1. A turbulent (Re = 5500), single phase flow in a pipe with 1.5 mm thick FEP walls was investigated. The results showed good agreement with literature data and measurements at a distance of y+ = 1 (0.02mm) could be obtained, proving the possibilities of FEP as refractive indexmatchingmaterial. A gravity driven vertical rod bundle flow loop with 3 × 3 subchannels, a subchannel is the free space in between 4 rods, and a diameter to pitch ratio of 0.7 was constructed. The FEP placed in the measurement section was shaped using a heat shrinking technique and attached by clamping. The fluid velocity could be measured across the complete cross section. Differences in streamwise and horizontal flow for laminar (Reb = 500) and turbulent (Reb = 9100) regime compared with literature data were found, which is attributed to the rod bundle setup that differs from the simulated geometry. The horizontal velocity components found were up to 10 times larger than expected, most likely caused by momentum transfer from the obliqueness of the rods in the vertical direction. The maximum possible sampling frequency depended strong on the number and thickness of FEP layers between the measurement volume and the probe. The shortest measurement distance from the wall was y+ = 1 (0.06 mm). The results indicate that the size of the LDA measurement volume limits this distance.},
bibtype = {inproceedings},
author = {van Campen, L. J. A. M.},
booktitle = {NUTHOS-7}
}
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A gravity driven vertical rod bundle flow loop with 3 × 3 subchannels, a subchannel is the free space in between 4 rods, and a diameter to pitch ratio of 0.7 was constructed. The FEP placed in the measurement section was shaped using a heat shrinking technique and attached by clamping. The fluid velocity could be measured across the complete cross section. Differences in streamwise and horizontal flow for laminar (Reb = 500) and turbulent (Reb = 9100) regime compared with literature data were found, which is attributed to the rod bundle setup that differs from the simulated geometry. The horizontal velocity components found were up to 10 times larger than expected, most likely caused by momentum transfer from the obliqueness of the rods in the vertical direction. The maximum possible sampling frequency depended strong on the number and thickness of FEP layers between the measurement volume and the probe. The shortest measurement distance from the wall was y+ = 1 (0.06 mm). 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