Comparative analyses of phase-detective intrusive probes in high-velocity air–water flows

Felder, Stefan (UNSW Australia, Water Research Laboratory, School of Civil and Environmental Engineering, Manly Vale, Australia) ; Pfister, Michael (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland ; Laboratory of Hydraulic Constructions (LCH), EPFL, Lausanne, Switzerland)

A comparative analysis of a wide range of air–water flow properties was conducted for two types of phase-detection intrusive probes including fiber-optical and conductivity probes. Experiments were conducted on a stepped spillway model for a skimming flow discharge q = 0.478 m2/s and for Re = 4.7 105 in a flow region just downstream of the inception point of free-surface aeration and in the fully developed flow region. The comparison of a large number of key air–water flow properties showed a very close agreement for the two sensor types including void fraction, interfacial velocity and equivalent clear water flow depth enabling a direct comparison of past and future data collected with either phase-detection probe type. Minor differences were observed in terms of chord sizes, clustered properties and interparticle arrival times linked with the slightly smaller sensor size of the fiber-optical probe. The in-line positioning of the leading and trailing tips of the fiber-optical probe affected the trailing tip properties resulting in elevated turbulence intensities. An optimum dual-tip phase-detection probe design should consist of small probe tips positioned side-by-side.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
iTEC - Institut des technologies de l'environnement construit
Date:
2017-04
Pagination:
14 p.
Published in:
International Journal of Multiphase Flow
Numeration (vol. no.):
2017, vol. 90, pp. 88-101
DOI:
ISSN:
0301-9322
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-10-13, last modified 2020-10-27

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