Recombination of Atomic Species on Surfaces

Scott, Clayton

doi:10.1007/978-94-009-0267-1_9

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…High velocity oxygen atom beam devices have acquired a great deal of interest as test facilities for spacecraft material testing. Atom recombination is one of the major sources of heat transfer to surfaces in earth re-entry conditions [1], and oxidization of surfaces occurs in low earth orbit such that corrosion takes place in satellites and in frequently flying space shuttles. Surface oxidization, moreover, seems to be enhanced at high velocity, and this fact can be utilized for the cold surface treatment, for example, of semiconductors.…”

Section: Introductionmentioning

confidence: 99%

A TALIF calibration method for quantitative oxygen atom density measurement in plasma jets

Dilecce¹,

Vigliotti²,

Benedictis³

2000

J. Phys. D: Appl. Phys.

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In this communication we propose a calibration method for two-photon absorption laser induced fluorescence (TALIF). It can be carried out without any addition or modification to the O atom TALIF set-up. It is based on the measurement of the collision quenching of the laser-excited state (3p 3 P 2 ) in a pure O 2 system in which a high dissociation degree can be achieved. Since the collision rate constant by O is largely lower than that by O 2 , the quenching rate can be correlated to the O density. The incertitude in this procedure is comparable to other calibration techniques. We have applied this method to the spatially resolved measurement of O atom density in an O 2 rf plasma jet.

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Section: Introductionmentioning

confidence: 99%

A TALIF calibration method for quantitative oxygen atom density measurement in plasma jets

Dilecce¹,

Vigliotti²,

Benedictis³

2000

J. Phys. D: Appl. Phys.

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“…The importance of CEA has been underlined by many authors on the basis of experimental finding [3,4,5,6] and the effects of the consequent production of excited molecules from a catalytic surface may have for gas-wall heat exchange and near wall gas chemistry have been also investigated [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of catalytic boundary conditions accounting for incomplete chemical energy accommodation

Barbato

Bellucci

Bruno³

1998

7th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

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The Chemical Energy Accomodation process occurring to gas atoms recombining catalytically on a solid surface is briefly presented. Due to the relevance this phenomenon might have for Thermal Protection Systems heat loads, an analysis of experimental data and recent models accounting for it is done.Information on the Chemical Energy Accomodation Coefficient j3 available so far from simple Langmuir-Hinshelwood or Eley-Rideal models is still not sufficient to draw final conclusions in regard to its behaviour with temperature and pressure, even for pure metals and SiO^-Using a hypersonic flow solver, a parametric analysis of the effect of varying /? is presented for nickel coated bodies past hypersonic air flows; catalytic boundary conditions have been modified to account for incomplete chemical energy accomodation. Effects on body heat load, gas temperature and degree of dissociation are examined. Large effects have been found for thermal loads whereas modest were the effects on gas composition. 'Research Engineer, Nomenclature c p specific heat at constant pressure, J/kg K D dissociation energy, J/mole T> s multi-diffusion coefficient, m 2 /s e total energy per unit mass J/kg ev vibrational-electronic energy per unit mass J/kg h enthalpy, J/kg h° formation enthalpy, J/kg k tr thermal conductivity for translational and rotational energy, J/m s kv thermal conductivity for vibrational and electronic energy, J/m s L body main dimension, m Ma Mach number n coordinate perpendicular to the body surface, m p pressure, Pa Q energy, J/mole q heat flux, W/m 2 T temperature, K u velocity vector X s molar fraction of s chemical species Y s mass fraction of s chemical species /? chemical energy accomodation factor e surface emissivity factor 7 energy-transfer catalytic recombination coefficient 7' atomic recombination coefficient [i mixture viscosity 9 surface coverage: ratio between $ of occupied and total $ of available sites on the catalyst surface p mass density, kg/m 3 cr Stefan-Boltzmann constant W/ m 2 K 4 Subscripts ads adsorption 9 gas R radiative Downloaded by MONASH UNIVERSITY on July 31, 2015 | http://arc.aiaa.org |

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Physico–chemical modelling in hypersonic flow simulation

Sarma¹

2000

Progress in Aerospace Sciences

142

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Recombination of Atomic Species on Surfaces

Cited by 5 publications

References 24 publications

A TALIF calibration method for quantitative oxygen atom density measurement in plasma jets

A TALIF calibration method for quantitative oxygen atom density measurement in plasma jets

Effects of catalytic boundary conditions accounting for incomplete chemical energy accommodation

Physico–chemical modelling in hypersonic flow simulation

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