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Exchange of Energy between Gases at Different Temperatures
AIP Publishing - Tập 5 Số 10 - Trang 1223-1225 - 1962
Edward A. Desloge
An expression for the energy exchange between two Maxwellian gases at different temperatures is derived. The resultant formula contains an integral in which the scattering cross section for momentum transfer appears. If the cross section for hard-sphere collisions is used, the expression reduces to an expression obtained by Cravath for this case. If the cross section for screened Coulomb i...... hiện toàn bộ
Nonlinear classical diffusion in a contained plasma
AIP Publishing - Tập 25 Số 2 - Trang 402-407 - 1982
B. C. Low
The one-dimensional Cartesian model for the resistive diffusion of a force-free magnetic field in a plasma of negligible inertia is treated for the case of confinement between rigid walls made of perfect electrical conductors. An exact analysis is given of the general initial-boundary value problem. The field evolution is driven by a competition between Ohmic loss and the induction effects...... hiện toàn bộ
Nonthermal Impurity Radiation from a Spherical Plasma
AIP Publishing - Tập 6 Số 1 - Trang 108-115 - 1963
S. Cuperman, F. Engelmann, J. Oxenius
The steady-state energy loss of a homogeneous and isothermal spherical plasma due to de-excitation radiation of impurity ions, assumed to have two energy levels only, is investigated without making the assumption that this radiation is thermal. A method developed by R. N. Thomas is adopted which consists in solving simultaneously the equation of radiative transfer and the equations for the...... hiện toàn bộ
Nonequilibrium Theory of Fluid Fluctuations
AIP Publishing - Tập 13 Số 4 - Trang 857-866 - 1970
F. L. Hinton
A generalization of previously existing theories of fluctuations in dilute monotonic gases is obtained which describes nonequilibrium states with spatial gradients. A kinetic description of the fluctuations is first derived, and the reduction to the fluid limit is then carried out. The theory can be used to describe the enhanced fluctuations which are expected to occur near the onset of hy...... hiện toàn bộ
Droplet Motion in Purified Systems
AIP Publishing - Tập 9 Số 1 - Trang 50-61 - 1966
S. Winnikow, B. T. Chao
Experimental results are presented of the behavior of droplets, falling in water at Reynolds numbers ranging from 138–971. The location of flow separation and the wake configuration were studied with a shadowgraph optical system. The measured drag coefficients were found to be higher than predicted by Chao, who assumed complete internal circulation and negligible flow separation. The agree...... hiện toàn bộ
Nonlinear properties of high amplitude ionization waves
AIP Publishing - Tập 17 Số 10 - Trang 1834-1840 - 1974
Igor Grabec
Nonlinear equations describing the state of a weakly ionized plasma in an unstable positive column are derived from a set of hydrodynamic equations, the Poisson equation, and the ionization frequency equation for the direct ionization process. In order to find the solution of the initial value problem, an iterative method is applied. Numerically solved examples show that unstable ionizatio...... hiện toàn bộ
Stability of an Electrically Charged Droplet
AIP Publishing - Tập 5 Số 5 - Trang 575-582 - 1962
Gedalia Ailam, Isaiah Gallily
The stability of an electrically charged droplet with respect to mechanical deformations is studied under the assumptions that the liquid is perfectly conducting, the medium devoid of external fields of force, and the sum of the electrical and mechanical energies in the system conserved. Unlike Rayleigh's case, which dealt with small perturbations of spherical drops, the deformations consi...... hiện toàn bộ
Laboratory double layers
AIP Publishing - Tập 22 Số 6 - Trang 1171-1181 - 1979
Peter Coakley, N. Hershkowitz
Strong electric potential double layers (eφ/Te≳10) are produced in the University of Iowa’s triple plasma device. The electron beam which results from acceleration by the double layer maintains its identity with little heating until it reaches the end of the chamber. Structure of the double layers is seen to depend upon the characteristics of the free and trapped particle species. A three-...... hiện toàn bộ
Effect of polymer additives on the small-scale structure of grid-generated turbulence
AIP Publishing - Tập 20 Số 6 - Trang 873-879 - 1977
W D McComb, John J. Allan, Clive Greated
The effect of polyethyleneoxide (Polyox grade WSR 301) on grid-generated turbulence was investigated using laser anemometry and flow-visualization techniques. It was found that the polymer additive reduced both the turbulent intensity and the rate of decay behind the grid. At typical drag-reducing concentrations, turbulent energy spectra were qualitatively the same as those in water, in ag...... hiện toàn bộ
Mean velocity and turbulent energy closures for flows with drag reduction
AIP Publishing - Tập 20 Số 10 - Trang S193-S196 - 1977
M. Poreh, S. Hassid
Earlier models for flows with drag reduction are reviewed and compared with a new energy-dissipation closure which describes the observed effects of drag reduction on the mean velocity, turbulent energy, and turbulent length-scale distributions, and suggests a new maximum drag reduction law related to the onset of drag reduction.
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