Two-phase flow measurements in un-stationary free-surface flows: a new signal decomposition technique

摘要: In free-surface flows, some flow instabilities may be observed, for example in pooled stepped spillways and hydraulic jumps. These include pulsations oscillations. Most traditional two-phase analyses would yield air-water turbulent results combining the contributions of slow fluctuations motion. Herein a new turbulence decomposition technique was introduced to quantify relative fast fluctuations. The method developed applied phase-detection probe signals collected highly-aerated flows. interfacial velocity properties were calculated based upon advanced correlation dual-tip signals. triple un-stationary spillway flows they highlighted that gross kinetic energy mostly encompassed fluctuating signal component. Altogether this study showed successful application suitable gas-liquid industrial applications with high void fractions.