title: Flow-induced separation in wall turbulence.
abstract: One of the defining characteristics of turbulence is its ability to promote mixing. We present here a case where the opposite happens-simulation results indicate that particles can separate near the wall of a turbulent channel flow, when they have sufficiently different Schmidt numbers without use of any other means. The physical mechanism of the separation is understood when the interplay between convection and diffusion, as expressed by their characteristic time scales, is considered, leading to the determination of the necessary conditions for a successful separation between particles. Practical applications of these results can be found when very small particles need to be separated or removed from a fluid.
authors: School of Chemical, Biological and Materials Engineering, The University of Oklahoma, 100 East Boyd St., SEC T-301, Norman, Oklahoma 73019, USA.
authors: Quoc
authors: Q
authors: Nguyen
authors: School of Chemical, Biological and Materials Engineering, The University of Oklahoma, 100 East Boyd St., SEC T-301, Norman, Oklahoma 73019, USA.
authors: Chiranth
authors: C
authors: Srinivasan
authors: School of Chemical, Biological and Materials Engineering, The University of Oklahoma, 100 East Boyd St., SEC T-301, Norman, Oklahoma 73019, USA.
authors: Dimitrios V
authors: DV
authors: Papavassiliou