AIP Publishing
0031-9171
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Các bài báo tiêu biểu
Equation of motion for a small rigid sphere in a nonuniform flowThe forces on a small rigid sphere in a nonuniform flow are considered from first prinicples in order to resolve the errors in Tchen’s equation and the subsequent modified versions that have since appeared. Forces from the undisturbed flow and the disturbance flow created by the presence of the sphere are treated separately. Proper account is taken of the effect of spatial variations of th... ...
Tập 26 Số 4 - Trang 883-889 - 1983
Finite-Resistivity Instabilities of a Sheet PinchThe stability of a plane current layer is analyzed in the hydromagnetic approximation, allowing for finite isotropic resistivity. The effect of a small layer curvature is simulated by a gravitational field. In an incompressible fluid, there can be three basic types of ``resistive'' instability: a long-wave ``tearing'' mode, corresponding to breakup of the layer along current-flow lines; a ... ...
Tập 6 Số 4 - Trang 459-484 - 1963
Couple Stresses in FluidsThe effects of couple stresses in fluids are considered. Linearized constitutive equations are proposed for force and couple stresses. A series of boundary-value problems are solved to indicate the effects of couple stresses as well as for experiments measuring the various material constants. It is found that a size effect comes in which is not present in the nonpolar case (couple stresses... ...
Tập 9 Số 9 - Trang 1709-1715 - 1966
Collisionless Damping of Nonlinear Plasma OscillationsIt is well known that the linear theory of collisionless damping breaks down after a time τ ≡ (m/eεκ)½, where κ is the wavenumber and ε is the amplitude of the electric field. Jacobi elliptic functions are now used to provide an exact solution of the Vlasov equation for the resonant electrons, and the damping coefficient is generalized to be valid for times greater than t = τ. This general... ...
Tập 8 Số 12 - Trang 2255-2262 - 1965
Nonlinear, three-dimensional magnetohydrodynamics of noncircular tokamaksRosenbluth’s nonlinear, approximate tokamak equations of motion are generalized to three dimensions. The equations describe magnetohydrodynamics in the low β, incompressible, large aspect ratio limit. Conservation laws are derived and a well-known form of the energy principle is recovered from the linearized equations. The equations are solved numerically to study kink modes in tokamaks wi... ...
Tập 19 Số 1 - Trang 134-140 - 1976
Coherent structures—reality and mythThe nature and significance of large-scale coherent structures in turblent shear flows are addressed. A definition for the coherent structure is proposed and its implications discussed. The characteristic coherent structure properties are identified and the analytical and experimental constraints in the eduction of coherent structures are examined. Following a few comments on coherent moti... ...
Tập 26 Số 10 - Trang 2816-2850 - 1983
Mechanism of atomization of a liquid jetIn the atomization regime of a round liquid jet, a diverging spray is observed immediately at the nozzle exit. The mechanism that controls atomization has not yet been determined even though several have been proposed. Experiments are reported with constant liquid pressures from 500 psia (33 atm) to 2500 psia (166 atm) with five different mixtures of water and glycerol into nitrogen, heliu... ...
Tập 25 Số 10 - Trang 1730-1742 - 1982
Rotational and Vibrational Relaxation in Diatomic GasesCalculations of rotational and vibrational relaxation times for gases composed of homonuclear diatomic molecules have been carried out. The model used for the molecular interaction potential consists of an attractive component, which acts between geometrical centers of the molecules, and a repulsive component which is assumed to originate from two centers of force in each of the molecules.... ...
Tập 2 Số 4 - Trang 449-462 - 1959
Geodesic Acoustic Waves in Hydromagnetic SystemsIn toroidal systems with geodesic curvature an electrostatic acoustic mode occurs with plasma motion in the magnetic surfaces, perpendicular to the field. In typical stellarators this mode should dominate ordinary sound waves associated with motion along the field.
Tập 11 Số 11 - Trang 2448-2450 - 1968
Statistical theory for compressible turbulent shear flows, with the application to subgrid modelingA statistical theory for compressible turbulent shear flows subject to buoyancy effects is developed. Important correlation functions in compressible shear flows are calculated with the aid of a multiscale direct-interaction approximation. They are expressed in the gradient-diffusion form similar to the eddy-viscosity representation for the Reynolds stress in incompressible flows. The resu... ...
Tập 29 Số 7 - Trang 2152-2164 - 1986