Where this problem is important?
What we need to understand
What we do not really know is:
Coupling between the flow and the solid particle motion:
one- or two-way coupling?
what’s important beyond the Stokes number?
This strongly affects our ability to model the two-phase, particulate flows on the computer and be sure that what we model really works. A short introduction from the Wikipedia:Particle laden flows
How do we study particle laden flows?
We can duplicate the 3D-PTV system, that captures 500 frames per second (fps) and stores the digital images for a long time (tens of minutes). We can use another system, for example based on a single high-speed camera of 2000 fps and the four-mirror view splitter (see the work of Mark Kreizer) and take measurements of the liquid phase (our usual flow tracers that diffract a green light) and the solid phase (solid particles of Silica Gel that are roughly 500 micrometers in diameter and have density of 1.4 gr/cm.c.)
Screenshot of 3D-PTV software with the first trajectories