Multiphase Flow Solutions

Simultaneous measurement of water-bubble flows

The solution for two phase flows is an innovative measurement tool that links particle image velocimetry (PIV) with laser-induced fluorescence (LIF).

This combination provides whole-field velocity data in two-phase water-bubble flows, with simultaneous separation and measurement of the different phases. It is a technique that permits the acquisition of new information about the role of large-scale structures in water-bubble flows.

The system provides:

• Simultaneous two-phase water-bubble measurements

• Combination of flow visualisation with accurate quantitative velocity data

• Velocity results in real-time.

How the system works - the water-bubble flow

Conventionally, PIV measures single-phase flow fields, with small tracer particles used to give a signal about the behaviour of either air or water flow. The combination of PIV with LIF, however, permits the simultaneous study of both phases of two-phase water-bubble flows. In two phase flow studies, the water phase of the flow field is seeded with fluorescent particles.

Dantec Dynamics's recording system simultaneously separates and samples the two phases: the first camera with an orange filter detects the fluorescent water seeding and a second camera, with a filter corresponding to the laser wavelength, detects only the bubble phase. Dantec Dynamics's PIV signal processors convert the separated camera images into whole-field velocity results in real-time.

More information

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