title: NMR measurement of nonlocal dispersion in complex flows.
abstract: The flow and diffusion driven separation of initially adjacent liquid molecules is known as dispersion. The primary physical quantity describing this process, the nonlocal dispersion tensor, provides insight regarding both the spatial and temporal correlations of molecular velocity fluctuations in complex flows. We here propose and demonstrate a nuclear magnetic resonance method for the measurement of this tensor, validating its implementation for the case of cylindrical Couette flow, and demonstrating its application to the study of fluid dispersion in a random bead pack.
authors.affiliation: MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, New Zealand.
authors.forename: M W
authors.initials: MW
authors.lastname: Hunter
authors.forename: P T
authors.initials: PT
authors.lastname: Callaghan
mesh_terms: D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008432:Mathematical Computing; D008962:Models, Theoretical; D009010:Monte Carlo Method; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods