How the dispersion of a droplet cloud depends on its initial size etc15 Tracking Number 487Presentation: Session: Multiphase and non-Newtonian flows 1 Room: Room G Session start: 13:30 Wed 26 Aug 2015 Dennis van der Voort d.d.v.d.voort@tue.nl Affifliation: Department of Applied Physics, Eindhoven University of Technology Guus Bertens a.c.m.bertens@student.tue.nl Affifliation: Department of Applied Physics, Eindhoven University of Technology, Humberto Bocanegra-Evans h.bocanegra.evans@gmail.com Affifliation: Department of Applied Physics, Eindhoven University of Technology, Nico Dam n.j.dam@tue.nl Affifliation: Department of Mechanical Engineering, Eindhoven University of Technology, Willem van de Water w.v.d.water@tue.nl Affifliation: Department of Applied Physics, Eindhoven University of Technology, Topics: - Turbulence in multiphase and non-Newtonian flows 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. |