Results 221 to 230 of about 2,396 (263)
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Sub- and supersonic expansion of an arc channel in liquid
Journal of Physics D: Applied Physics, 2006Post-breakdown expansion of a submerged discharge was considered taking into account the curvature of the plasma boundary and the sound and shock wave fronts. Numerical calculations were performed for an inter-electrode gap of 10−5 m, electrical current and voltage of 10 A and 100 V, respectively and a water medium.
E Gidalevich, R L Boxman
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Electronic excitations of magnesium tetraphenylporphyrin in supersonic expansions
The Journal of Chemical Physics, 1982In this paper we report the results of our experimental study of the fluorescence excitation spectrum of Mg tetraphenylporphyrin (MgTPP) seeded in supersonic expansions of He. The spectra of the ’’isolated,’’ internally cold, bare MgTPP molecule reveal a well-resolved vibrational structure for the S0→S1 transition (the Q band), as well as for the S0→S2
Uzi Even +3 more
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SF6 condensation in supersonic nozzle expansions
The Physics of Fluids, 1979The condensation of SF6 in a dilute mixture with either Ar or He as a carrier gas when quickly expanded in a small, adjustable nozzle is investigated. Condensation is observed by monitoring the disappearance of individual rotational-state lines in the SF6 ν4 absorption band.
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Supersonic expansion on non-equilibrium plasmas
Progress in Aerospace Sciences, 1975Abstract In the supersonic expansion of an ionized gas, the dominant factor in describing the atomic processes is the recombination rate constant KR. Several models describing the recombination process have been reviewed in some detail. It has been found that, depending on the adopted definition, different models will yield different values of KR for
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Laser plasma production and expansion in a supersonic flow
40th AIAA Aerospace Sciences Meeting & Exhibit, 2002Laser plasma was produced in a Af=2 flow, in a quiescent standard atmosphere, and in a quiescent air at reduced pressure. The efficiency in producing an explosion was estimated from the shadowgraph images. In the M=2 flow, the efficiency was found 0.4. This value was almost same with that in the quiescent standard atmosphere.
K. Mori, K. Komurasaki, Y. Arakawa
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On the total axial-symmetric expansion of a supersonic stream
Acta Astronautica, 1982Abstract This paper is concerned with an axi-symmetric expansion, namely the one obtained by injecting a supersonic stream outside a circular porous cone. The equations are solved for given initial conditions by using a numerical method. Certain similarities with the two-dimensional Prandtl-Meyer expansion are presented.
E. Carafoli, C. Berbente, E. Serbǎnescu
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Electronic nonequilibrium in a supersonic expansion of ionized gas
The Physics of Fluids, 1974An experimental and analytical study of nonequilibrium among the populations of the excited levels of potassium vapor passing through a supersonic nozzle is presented. In the experiment a small amount of potassium vapor was injected into a flow of a mixture of argon and helium, heated by an arc jet electric discharge to a temperature of approximately ...
D. D. McGregor, M. Mitchner
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Chemistry and Chemical Intermediates in Supersonic Free Jet Expansions
Science, 1984Short-lived intermediates often play key roles in determining the course of chemical reactions. Recently the combination of sophisticated laser techniques and supersonic free jet expansions has offered new insight into the structure and reactivity of such intermediates.
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Vibrational relaxation in pyridine upon supersonic expansion
The Journal of Chemical Physics, 2000The rotational spectra of five vibrational states of pyridine have been assigned and measured by millimeter wave absorption spectroscopy in a supersonic expansion. The intensities of the lines of the vibrational satellites with respect to the ground state after the supersonic expansion depend on the kind of carrier gas, backing pressure, pyridine ...
Assimo Maris +4 more
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Mixing Measurements in a Supersonic Expansion-Ramp Combustor
Flow, Turbulence and Combustion, 2008This paper reports results on molecular mixing for injection via an expansion-ramp into a supersonic freestream with M 1 = 1.5. This geometry produces a compressible turbulent shear layer between an upper, high-speed “air” stream and a lower, low-speed “fuel” stream, injected through an expansion-ramp at α = 30° to the high ...
Bonanos, Aristides M. +2 more
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