Kinetic Theory of Source Flow Expansion with Application to the Free Jet

Hamel, B.B.

doi:10.1063/1.1761783

Cited by 179 publications

(74 citation statements)

References 4 publications

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“…The electron density also decreases with the square of the axial coordinate. [5][6][7][8][9][10][11][12][13][14][15] In Fig. 4 the experimental values and the modeling results show the same decrease.…”

Section: ͑21͒mentioning

confidence: 54%

Plasma expansion in the preshock region

Burm

Goedheer

Schram

2001

Journal of Applied Physics

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The supersonic expansion of an underexpanding argon plasma from a high density arc source with small dimensions into a low-pressure vessel with large dimensions is studied by an extended one-dimensional nonlocal thermal equilibrium fluid model, called SPIRIT. In an expanding plasma the velocity increases and the pressure, the density, and the temperatures decrease severely. In this article the virtual source model is discussed first, which is a model describing the expanding plasma as originating from a virtual source. The virtual source model includes some viscosity and heat transport in simplified form, but most of the viscosity and heat transport contributions are neglected. The SPIRIT code includes the full energy and momentum balances. The inclusion of viscosity and heat sources may lead to deviations from an adiabatic and/or isentropic expansion. The SPIRIT code can analyze the deviations. When deviations are small, the isentropic expressions from gas dynamics can be used to model expanding plasma too. Model outcomes are compared with experimental data.

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Section: ͑21͒mentioning

confidence: 54%

Plasma expansion in the preshock region

Burm

Goedheer

Schram

2001

Journal of Applied Physics

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“…Figure 2 and Figs. [5][6] show that the most of the inner part of the gas cloud remains in translational equilibrium. This results because the mass density is still high enough in the cloud to equilibrate the translational modes at this initial phase of the gas expansion.…”

Section: Resultsmentioning

confidence: 99%

“…15. SUBJECT anisotropic temperature gas models [5][6][7] This model accounts for translational non-equilibrium effects and is appropriate for these simulations. The equations are solved numerically using the kinetic flux splitting method 8 for the inviscid fluxes and central difference scheme for the dissipative fluxes.…”

Section: Introductionmentioning

confidence: 99%

Simulations of gas cloud expansion using a multi-temperature gas dynamics model

Dogra¹,

Erlandson²,

Swaminathan³

et al. 2001

AIP Conference Proceedings

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Abstract.Simulations are performed using a multiple temperature gas model to investigate translational non-equilibrium effects in a rapid expansion of a high temperature argon gas cloud into a rarefied atmosphere. A set of continuum conservation equations based on kinetic theory, which includes anisotropic forms for the temperature, pressure and speed ratio, are solved numerically using a flux splitting scheme for the inviscid fluxes and a central difference scheme for the viscous fluxes in a time accurate manner. Results obtained for the initial expansion of the spherical gas cloud from a high density source condition show that translational non-equilibrium exists in the shock front region which propagates into the ambient atmosphere. For a lower density source condition, translational non-equilibrium not only exists in the shock front but also in the inner gas cloud region where the temperature normal to the radial direction freezes at a value just below the initial source temperature.

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“…As a matter of fact, our second incentive to resort to a possibly strongly anisotropic freeze-out distribution is the observation of a similar asymmetry, parametrised as two different translation temperatures along the streamlines and perpendicular to them, in hypersonic nonrelativistic flows [24].…”

Section: Motivationmentioning

confidence: 99%

Kinetic freeze-out from an anisotropic fluid in high-energy heavy-ion collisions: particle spectra, Hanbury Brown–Twiss radii, and anisotropic flow

2015

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Dissipative relativistic fluid-dynamical descriptions of the extended fireball formed in high-energy heavyion collisions are quite successful; yet they require a prescription for converting the fluid into particles. We present arguments in favour of using a locally anisotropic momentum distribution for the particles emitted from the fluid, so as to smooth out discontinuities introduced by the usual conversion prescriptions. Building on this ansatz, we investigate the effect of the asymmetry on several observables of heavy-ion physics.

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Kinetic Theory of Source Flow Expansion with Application to the Free Jet

Cited by 179 publications

References 4 publications

Plasma expansion in the preshock region

Plasma expansion in the preshock region

Simulations of gas cloud expansion using a multi-temperature gas dynamics model

Kinetic freeze-out from an anisotropic fluid in high-energy heavy-ion collisions: particle spectra, Hanbury Brown–Twiss radii, and anisotropic flow

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