Abstract
Air-water free-surface flows are extremely complicated to model physically and numerically. The development of the air-water velocity metrology has been relatively slow and is still on-going. Phase-detection needle probes have been successfully used for both laboratory and field measurements in high-turbulence air-water flows, but the signal processing is not trivial. Recently a different method, called adaptive window cross-correlations (AWCC), was introduced for dual-tip phase-detection probe signals in steady air-water flows (Kramer et al. 2019). The technique includes a number of intrinsic limitations, which can lead to very poor data retention rates and does not guarantee better data quality and bias-free outputs. These limitations are discussed in the context of air-water free-surface flows.
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