Shock wave and plasma dynamics in a surface discharge flash lamp

Chazaud, F.; Sentís, M.; Le, Hai; Rigneault, Hervé; Delaporte, Ph.; Marine, W.

doi:10.1063/1.112932

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…To measure the pressure in the hot superheated water filament more directly, we have monitored micro shock waves in air that originate from the irradiated microjet for the same internal energy as detailed above (Figure ). The increasing radius of the shock wave (SFR) is plotted against time, and an expression SFR( t ) = A ( E ) t x , with A = 8.5 ± 1.1 and x = 0.67 ± 0.01, is fitted to the data (Figure ). , From these data an initial shock wave velocity can be determined to be close to 2000 m s -1 . It has been shown that strong shock waves enable the determination of the equation of state (EOS) of water for extreme temperatures and pressures.…”

Section: Resultsmentioning

confidence: 99%

“…The increasing radius of the shock wave (SFR) is plotted against time, and an expression SFR(t) ) A(E)t x , with A ) 8.5 ( 1.1 and x ) 0.67 ( 0.01, is fitted to the data ( Figure 6). 59,60 From these data an initial shock wave velocity can be determined to be close to 2000 m s -1 . It has been shown that strong shock waves enable the determination of the equation of state (EOS) of water for extreme temperatures and pressures.…”

Section: A Oh-stretch Mode As a Probe Of Hydrogen-bondmentioning

confidence: 99%

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Product Screening of Fast Reactions in IR-Laser-Heated Liquid Water Filaments in a Vacuum by Mass Spectrometry

2006

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In the present article a novel approach for rapid product screening of fast reactions in IR-laser-heated liquid microbeams in a vacuum is highlighted. From absorbed energies, a shock wave analysis, high-speed laser stroboscopy, and thermodynamic data of high-temperature water the enthalpy, temperature, density, pressure, and the reaction time window for the hot water filament could be characterized. The experimental conditions (30 kbar, 1750 K, density approximately 1 g/cm3) present during the lifetime of the filament (20-30 ns) were extreme and provided a unique environment for high-temperature water chemistry. For the probe of the reaction products liquid beam desorption mass spectrometry was employed. A decisive feature of the technique is that ionic species, as well as neutral products and intermediates may be detected (neutrals as protonated aggregates) via time-of-flight mass spectrometry without any additional ionization laser. After the explosive disintegration of the superheated beam, high-temperature water reactions are efficiently quenched via expansion and evaporative cooling. For first exploratory experiments for chemistry in ultrahigh-temperature, -pressure and -density water, we have chosen resorcinol as a benchmark system, simple enough and well studied in high-temperature water environments much below 1000 K. Contrary to oxidation reactions usually present under less extreme and dense supercritical conditions, we have observed hydration and little H-atom abstraction during the narrow time window of the experiment. Small amounts of radicals but no ionic intermediates other than simple proton adducts were detected. The experimental findings are discussed in terms of the energetic and dense environment and the small time window for reaction, and they provide firm evidence for additional thermal reaction channels in extreme molecular environments.

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Section: Resultsmentioning

confidence: 99%

Section: A Oh-stretch Mode As a Probe Of Hydrogen-bondmentioning

confidence: 99%

Product Screening of Fast Reactions in IR-Laser-Heated Liquid Water Filaments in a Vacuum by Mass Spectrometry

2006

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“…In particular, it has been shown [12] that the use of plasma electrodes in the volume discharge of a CO 2 laser shock wave heats the volume of the laser and limits the frequency of the generated laser radiation. The interval between pulses had to be increased [13,14]-shock waves from pulsed discharges limit the use of the volume discharge as a light source [15][16][17][18]. On the other hand, high-energy discharges of short duration can be sources of intensive controlled shock waves and may be used for various applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of shock waves from plasma actuators on transonic and supersonic airflow

Mursenkova¹,

Znamenskaya²,

Lutsky³

2018

J. Phys. D: Appl. Phys.

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This paper presents experimental and numerical investigations of high-current sliding surface discharges of nanosecond duration and their effect on high-speed flow as plasma actuators in a shock tube. This study deals with the effectiveness of a sliding surface discharge at low and medium air pressure. Results cover the electrical characteristics of the discharge and optical visualization of the discharge and high-speed post-discharge flow. A sliding surface discharge is first studied in quiescent air conditions and then in high-speed flow, being initiated in the boundary layer at a transverse flow velocity of 50–950 m s−1 behind a flat shock wave in air of density 0.04–0.45 kg m−3. The discharge is powered by a pulse voltage of 25–30 kV and the electric current is ~0.5 kA. Shadow imaging and particle image velocimetry (PIV) are used to measure the flow field parameters after the pulse surface discharge. Shadow imaging reveals shock waves originating from the channels of the discharge configurations. PIV is used to measure the velocity field resulting from the discharge in quiescent air and to determine the homogeneity of energy release along the sliding discharge channel. Semicylindrical shock waves from the channels of the sliding discharge have an initial velocity of more than 600 m s−1. The shock-wave configuration floats in the flow along the streamlined surface. Numerical simulation based on the equations of hydrodynamics matched with the experiment showed that 25%–50% of the discharge energy is instantly transformed into heat energy in a high-speed airflow, leading to the formation of shock waves. This energy is comparable to the flow enthalpy and can result in significant modification of the boundary layer and the entire flow.

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Recent Progress in France on Excimer Lasers and Applications

Fontaine¹

1996

Gas Lasers - Recent Developments and Future Prospects

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Shock wave and plasma dynamics in a surface discharge flash lamp

Cited by 7 publications

References 6 publications

Product Screening of Fast Reactions in IR-Laser-Heated Liquid Water Filaments in a Vacuum by Mass Spectrometry

Product Screening of Fast Reactions in IR-Laser-Heated Liquid Water Filaments in a Vacuum by Mass Spectrometry

Influence of shock waves from plasma actuators on transonic and supersonic airflow

Recent Progress in France on Excimer Lasers and Applications

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