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Session: Multiphase and non-Newtonian flows 1
Session starts: Wednesday 26 August, 13:30
Presentation starts: 14:00
Room: Room H

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Dennis van der Voort (Department of Applied Physics, Eindhoven University of Technology)
Guus Bertens (Department of Applied Physics, Eindhoven University of Technology,)
Humberto Bocanegra-Evans (Department of Applied Physics, Eindhoven University of Technology,)
Nico Dam (Department of Mechanical Engineering, Eindhoven University of Technology,)
Willem van de Water (Department of Applied Physics, Eindhoven University of Technology,)

Abstract:
A cloud of droplets evolves under the influence of strong turbulence. The droplets are made from a phosphorescent fluid. From this cloud we select at t = 0 a narrow line by exciting the droplets with a UV laser, which causes them to glow for a few milliseconds. The dispersion of this line is followed in time using a fast intensified camera. A large range of droplet sizes (Stokes number St) was measured. It appears that lines with St \approx 1 disperse faster than a line of fluid tracers. Lines of droplets which are narrowest initially, spread fastest.