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Multi-Paramter Imaging in Multiphase Flows

One of the most prominent example for multiphase flows are bubbles dispersed in water. The interaction of both phases is investigated applying a color-coded dual imaging approach: for flow field imaging in water a green light sheet is used to excite the red fluorescence of the PIV particles seeded to the water, and a blue backlight LED screen is used for shadowgraphy tracking bubble shape, size and velocity. A beam splitter in front of the cameras separates the color-coded information from both phases before detection. The recordings of both channels are synchronized and their fields of view are perfectly matched onto each other applying the image mapping functionality in DaVis.

Imaging in Multiphase Flows
  • PIV w/ fluorescent particles: continous phase flow field
  • time-resolved shadowgraphy: bubble shape, size and velocity
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Dual channel imaging setup for combined PIV and shadow measurements
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Multi-parameter imaging in bubbly flows

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