摘要:

A method of solution describing the steady behavior of a free molecular gas around a group of bodies at rest and with various temperature distributions is presented. For any closed system and a class of unbounded systems, the velocity distribution function is expressed by a series consisting of the boundary data (temperature and accommodation coefficient) on the past path of the specularly reflecting molecules.

ISSN:0031-9171    

DOI:10.1063/1.865166

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

The spectrum of the lateral derivative of temperature has been measured on the center line of a turbulent plane jet and compared with calculations, based on local isotropy, derived from the spectra of either the streamwise derivative or the temporal derivative of temperature. To within the experimental uncertainty, quantitative agreement between measurement and calculation is satisfactory for sufficiently large wavenumbers.

ISSN:0031-9171    

DOI:10.1063/1.865167

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

The infinite series of functions present in the ponderomotive Hamiltonian are explicitly summed using Newberger’s sum rule. The result is a compact and easily evaluated expression for the ponderomotive Hamiltonian. Application of theK‐&khgr; theorem yields the linear susceptibility of relativistic magnetized plasma in agreement with, but generalizing, the previous result of Weiss and Weitzner.

ISSN:0031-9171    

DOI:10.1063/1.865168

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

A novel Lagrangian formulation is proposed for self‐consistent fluid mechanics problems, like magnetohydrodynamics, in which the force field is to be determined along with the velocity field. A key feature of the formulation is that the momentum balance and continuity equations are exactly satisfied locally, even in numerical applications. This is accomplished by choosing a Lagrangian representation for the velocity field and using the momentum balance equation to cmpute the force field pointwise in terms of the Lagrangian mapping function. The formulation is illustrated for one‐dimensional electrohydrodynamics, in which case the mass continuity and momentum balance equations are coupled to the Poisson equation. The formulation may be suitable for describing phenomena like the formation of convective cells, boundary layers, or discontinuities in a natural way.

ISSN:0031-9171    

DOI:10.1063/1.865169

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

It is shown that a spectrum of stationary electrostatic fluctuations can destabilize the tearing modes. Since the growth of this nonlinear instability is rapid, it can affect the plasma confinement in magnetic fusion devices.

ISSN:0031-9171    

DOI:10.1063/1.865170

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

Plasma heating by the oscillating component of the pondermotive force of a very intense light wave is discussed.

ISSN:0031-9171    

DOI:10.1063/1.865171

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

Experimental evidence is presented on the effect of the finite width of the current channel for the excitation of the current‐driven ion‐cyclotron instability. The results are in agreement with the nonlocal theory of Bakshi, Ganguli, and Palmadesso.

ISSN:0031-9171    

DOI:10.1063/1.865412

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

A hollow relativistic electron beam produced in a strong axial magnetic field has been extracted into a neutral gas cell where the field is zero. In the field‐free region, equilibrium is dictated by a balance between thevz×B&thgr;radial pinch force and the centrifugal outward force. Extraction and propagation of these beams has been studied experimentally with a variety of diagnostics. A strong, low‐frequency filamentation instability is observed after extraction. In general, 80% of the beam energy has been extracted and propagated 75 cm. Beam equilibrium properties are in good agreement with simple theory with the exception of the azimuthal plasma current.

ISSN:0031-9171    

DOI:10.1063/1.865172

出版商:AIP    

年代:1985

数据来源: AIP

ISSN:0031-9171    

DOI:10.1063/1.865432

出版商:AIP    

年代:1985

数据来源: AIP