title: Energy transport in a shear flow of particles in a two-dimensional dusty plasma.
abstract: A shear flow of particles in a laser-driven two-dimensional (2D) dusty plasma is observed in a study of viscous heating and thermal conduction. Video imaging and particle tracking yields particle velocity data, which we convert into continuum data, presented as three spatial profiles: mean particle velocity (i.e., flow velocity), mean-square particle velocity, and mean-square fluctuations of particle velocity. These profiles and their derivatives allow a spatially resolved determination of each term in the energy and momentum continuity equations, which we use for two purposes. First, by balancing these terms so that their sum (i.e., residual) is minimized while varying viscosity η and thermal conductivity κ as free parameters, we simultaneously obtain values for η and κ in the same experiment. Second, by comparing the viscous heating and thermal conduction terms, we obtain a spatially resolved characterization of the viscous heating.
authors.affiliation: Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA. yanfengui@gmail.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Feng
authors.forename: J
authors.initials: J
authors.lastname: Goree
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
mesh_terms: D003198:Computer Simulation; D004391:Dust / Q000032:analysis*; D004735:Energy Transfer; D006358:Hot Temperature; D008956:Models, Chemical; D008958:Models, Molecular; D058626:Plasma Gases / Q000737:chemistry*; D012212:Rheology / Q000379:methods*
chemical_list: D004391:Dust; D058626:Plasma Gases