title: Taylor particle dispersion during transition to fully developed two-dimensional turbulence.
abstract: We report new measurements of single particle dispersion in turbulent two-dimensional (2D) flows. Laboratory experiments in electromagnetically driven and Faraday wave driven turbulence reveal a transition from weakly dispersing superdiffusive regime to strongly dispersing Brownian diffusion as the flow energy is increased in a broad range. The transition to fully developed 2D turbulence is characterized by the topological changes in the fluid particle trajectories and the development of self-similar diffusion. The degree of 2D turbulence development can be quantified by a parameter describing the deviation of single particle dispersion from the Taylor dispersion.
authors.affiliation: Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: H
authors.initials: H
authors.lastname: Xia
authors.affiliation: Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: N
authors.initials: N
authors.lastname: Francois
authors.affiliation: Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: H
authors.initials: H
authors.lastname: Punzmann
authors.affiliation: Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Shats