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Dual-tip phase-detection probes can be used to measure flow properties ingas-liquid flows. Traditionally, time-averaged interfacial velocities have beenobtained through cross-correlation analysis of long time-series of phasefraction signals. Using small groups of detected particles, a recentlydeveloped adaptive window cross-correlation (AWCC) technique enables thecomputation of pseudo-instantaneous interfacial velocities and turbulencequantities in highly aerated flows, albeit subject to some smoothing which isdue to the use of a finite window duration. This manuscript provides guidanceon the selection of optimum processing parameters for the AWCC technique,additionally addressing shortcomings such as velocity bias correction inturbulent flows and extrapolation of turbulence levels to single particles. Thepresented technique was tested for three highly turbulent air-water flows:smooth and rough-wall boundary layers (tunnel chute and stepped spillway), aswell as breaking shear layer flows of a hydraulic jump. Robust estimations ofmean velocities and velocity fluctuations were obtained for all flowsituations, either using dual-tip conductivity or fiber optical probe data. Thecomputation of integral time scales and velocity spectra is currently limitedby the data rate and must be treated with caution.

Best practices for velocity estimations in highly aerated flows with dual-tip phase-detection probes