Lagrangian method to simultaneously characterize transport behaviour of liquid and solid phases: a feasibility study in a confined vortex ring
An experimental method was developed for the fully resolved, quasi-simultaneous measurement of the liquid and solid phases in a suspension (2% volume fraction). A Lagrangian measurement technique, Shake-The-Box (STB), was used to investigate suspended particle–vortex interactions in a confined vortex ring. The repeatability of the vortex-ring generator allowed liquid- and solid-phase tracers, which were tracked independently, to be combined into a quasi-simultaneous measurement pair. The liquid-phase results were first verified by particle image velocimetry (PIV), and vorticity field measurements of vortex-ring formation were found to be nearly identical with both techniques. The suspended particles (measured by STB) were seen to closely follow the liquid phase through the formation of a stable vortex ring. Furthermore, calculating the vorticity-history of each fluid parcel revealed the vortex entrainment process, laminar-to-turbulent transition, and instability of the vortex ring itself. Particle–wall interactions, such as large volumes of ambient particles being transported into the near-wall region, were observed by extending and labelling fluid parcels’ pathlines based on their source. Finally, individual fluid-parcel trajectory and vorticity calculations allowed the interactions between coherent structures and suspended particles to be investigated.
The authors would like to thank the Natural Sciences and Engineering Research Council of Canada (NSERC) for their support.
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