Two-dimensional flow characteristic of a hot expanding plasma

O.G. Gabriel, P.G.J. Colsters, D.C. Schram, R.A.H. Engeln

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A hot argon plasma expansion into a low-pressure background is investigated by means of laser induced fluorescence on argon metastables. The result is a complete two-dimensional flow field of the expanding system that covers the area reaching from the nozzle of the plasma source to the shock front of the expansion. This flow field includes information on atom velocities, densities and temperatures. It consists of two different components: a fast, cool supersonically expanding one and a slow, hot component resulting from invasion of the background gas. This invading component is first present at the outside of the barrel shock and gradually invades the expansion towards the center axis. The supersonic component, dominating the first part of the expansion, shows all characteristics of rarefied hot gas flows: acceleration to twice the sonic velocity of the source, adiabatic cooling and a parallel temperature remaining higher than the perpendicular one. However, the invading component is much slower, but also hotter due to collisions in the expanding flow, and is already present before the shock front. The total flow of argon atoms is also described by computer simulations. The result shows the same behavior as the measured flow. The importance of the invading component for radical production is also demonstrated by LIF measurements on atomic oxygen that is produced from background O2 inside the expanding system.
Originele taal-2Engels
Pagina's (van-tot)015011-1/8
TijdschriftPlasma Sources Science and Technology
Volume17
Nummer van het tijdschrift1
DOI's
StatusGepubliceerd - 2008

Vingerafdruk

two dimensional flow
flow characteristics
high temperature plasmas
expansion
shock fronts
laser induced fluorescence
flow distribution
argon
rarefied gases
argon plasma
high temperature gases
nozzles
gas flow
atoms
low pressure
computerized simulation
shock
cooling
collisions
oxygen

Citeer dit

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title = "Two-dimensional flow characteristic of a hot expanding plasma",
abstract = "A hot argon plasma expansion into a low-pressure background is investigated by means of laser induced fluorescence on argon metastables. The result is a complete two-dimensional flow field of the expanding system that covers the area reaching from the nozzle of the plasma source to the shock front of the expansion. This flow field includes information on atom velocities, densities and temperatures. It consists of two different components: a fast, cool supersonically expanding one and a slow, hot component resulting from invasion of the background gas. This invading component is first present at the outside of the barrel shock and gradually invades the expansion towards the center axis. The supersonic component, dominating the first part of the expansion, shows all characteristics of rarefied hot gas flows: acceleration to twice the sonic velocity of the source, adiabatic cooling and a parallel temperature remaining higher than the perpendicular one. However, the invading component is much slower, but also hotter due to collisions in the expanding flow, and is already present before the shock front. The total flow of argon atoms is also described by computer simulations. The result shows the same behavior as the measured flow. The importance of the invading component for radical production is also demonstrated by LIF measurements on atomic oxygen that is produced from background O2 inside the expanding system.",
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Two-dimensional flow characteristic of a hot expanding plasma. / Gabriel, O.G.; Colsters, P.G.J.; Schram, D.C.; Engeln, R.A.H.

In: Plasma Sources Science and Technology, Vol. 17, Nr. 1, 2008, blz. 015011-1/8.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Two-dimensional flow characteristic of a hot expanding plasma

AU - Gabriel, O.G.

AU - Colsters, P.G.J.

AU - Schram, D.C.

AU - Engeln, R.A.H.

PY - 2008

Y1 - 2008

N2 - A hot argon plasma expansion into a low-pressure background is investigated by means of laser induced fluorescence on argon metastables. The result is a complete two-dimensional flow field of the expanding system that covers the area reaching from the nozzle of the plasma source to the shock front of the expansion. This flow field includes information on atom velocities, densities and temperatures. It consists of two different components: a fast, cool supersonically expanding one and a slow, hot component resulting from invasion of the background gas. This invading component is first present at the outside of the barrel shock and gradually invades the expansion towards the center axis. The supersonic component, dominating the first part of the expansion, shows all characteristics of rarefied hot gas flows: acceleration to twice the sonic velocity of the source, adiabatic cooling and a parallel temperature remaining higher than the perpendicular one. However, the invading component is much slower, but also hotter due to collisions in the expanding flow, and is already present before the shock front. The total flow of argon atoms is also described by computer simulations. The result shows the same behavior as the measured flow. The importance of the invading component for radical production is also demonstrated by LIF measurements on atomic oxygen that is produced from background O2 inside the expanding system.

AB - A hot argon plasma expansion into a low-pressure background is investigated by means of laser induced fluorescence on argon metastables. The result is a complete two-dimensional flow field of the expanding system that covers the area reaching from the nozzle of the plasma source to the shock front of the expansion. This flow field includes information on atom velocities, densities and temperatures. It consists of two different components: a fast, cool supersonically expanding one and a slow, hot component resulting from invasion of the background gas. This invading component is first present at the outside of the barrel shock and gradually invades the expansion towards the center axis. The supersonic component, dominating the first part of the expansion, shows all characteristics of rarefied hot gas flows: acceleration to twice the sonic velocity of the source, adiabatic cooling and a parallel temperature remaining higher than the perpendicular one. However, the invading component is much slower, but also hotter due to collisions in the expanding flow, and is already present before the shock front. The total flow of argon atoms is also described by computer simulations. The result shows the same behavior as the measured flow. The importance of the invading component for radical production is also demonstrated by LIF measurements on atomic oxygen that is produced from background O2 inside the expanding system.

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