Phase-Detection Probe Measurements in High-Velocity Free-Surface Flows including a Discussion of Key Sampling Parameters

Felder, Stefan and Chanson, Hubert (2015) Phase-Detection Probe Measurements in High-Velocity Free-Surface Flows including a Discussion of Key Sampling Parameters. Experimental Thermal and Fluid Science, 81 66-78. doi:10.1016/j.expthermflusci.2014.10.009


Author Felder, Stefan
Chanson, Hubert
Title Phase-Detection Probe Measurements in High-Velocity Free-Surface Flows including a Discussion of Key Sampling Parameters
Journal name Experimental Thermal and Fluid Science   Check publisher's open access policy
ISSN 0894-1777
1879-2286
Publication date 2015-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.expthermflusci.2014.10.009
Volume 81
Start page 66
End page 78
Total pages 13
Place of publication Philadelphia, PA United States
Publisher Elsevier Inc.
Collection year 2015
Language eng
Formatted abstract
Air–water high-velocity flows are characterised by strong interactions of air bubbles and water droplets. The void fraction ranges from a few percent in bubbly flows to up to 100% at the free-surface and a reliable measurement instrumentation is the phase-detection intrusive probe. Herein new experiments were conducted on a stepped spillway (θ = 26.6°) in transition and skimming flow sub-regimes yielding new insights into the turbulent air–water flow properties including the turbulence intensities and integral turbulent time and length scales. The integral turbulent scales showed self-similarity independently of the flow regime. A sensitivity analysis was conducted on the phase-detection probe signals to investigate the optimum sampling duration and frequency as well as the data analysis parameters threshold, sub-sampling duration, histogram bin sizes and cut-off effects. The results provide recommendations in terms of optimum sampling and processing parameters for high-velocity air–water flows.
Keyword Phase Detection Probe
High Velocity Free Surface Flows
Key Sampling Parameters
Conductivity probes
Signal processing
Stepped spillway
Air water flow properties
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 28 October 2014.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
 
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Created: Tue, 11 Nov 2014, 19:09:48 EST by Hubert Chanson on behalf of School of Civil Engineering