Nonequilibrium Vibrational Kinetics of an O/O Mixture Hitting a Catalytic Surface

Armenise, I.; Capitelli, M.; Gorse, C.; Cacciatore, M.; Rutigliano, M.

doi:10.2514/2.3581

Cited by 29 publications

(96 citation statements)

References 12 publications

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“…Another monatomic molecule A collides with A trapped on the surface of the wall and provokes recombination. This recombination process on the surface of the wall was simulated using the state-to-state kinetics [24][25][26] or the molecular dynamics method. 27 Meanwhile, the distribution function of trapped monatomic molecules A on the surface of the wall is not formulated by our model, because our model assumes that A Ã 2 intermediates are diffusively emitted from the wall by following the distribution, which is defined at the wall, after they collide with the wall.…”

Section: Kinetic Model Of Finite-wall Catalysis For Monatomic Momentioning

confidence: 99%

Kinetic description of finite-wall catalysis for monatomic molecular recombination

Yano

Suzuki

2011

Physics of Fluids

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In our previous study on hypothetical diatomic molecular dissociation and monatomic molecular recombination, et al., Phys. Fluids 21, 127101 (2009)], the interaction between the wall and A Ã 2 intermediates was not formulated. In this paper, we consider the effect of finite-wall catalysis on recombination of a monatomic molecule A via the interaction between the wall and A Ã 2 . According to the proposed Boltzmann model equation, the catalytic recombination rate depends on two quantities; the vibrational temperature and the translational temperature of A Ã 2 intermediates that are emitted from the wall. In particular, the translational temperature of A Ã 2 is related to its lifetime. In this paper, we investigate the change in the catalytic recombination rate of A upon changing the vibrational temperature of A Ã 2 intermediates that are emitted from the wall. As an object of analysis, the rarefied hypersonic flow around a cylinder with a finite wall-catalysis is considered using the proposed Boltzmann model equation. Numerical results confirm that a decrease in the vibrational temperature of A Ã 2 intermediates that are emitted from the wall results in an increase in recombination of A near the wall.

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Section: Kinetic Model Of Finite-wall Catalysis For Monatomic Momentioning

confidence: 99%

Kinetic description of finite-wall catalysis for monatomic molecular recombination

Yano

Suzuki

2011

Physics of Fluids

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“…In several works [7][8][9][10], the Bari and SPU teams intentionally solved a simplified set of boundary-layer equations by introducing the following assumptions: 1) Fick's law for diffusion fluxes is used with diffusion coefficients that are species-independent and constant along the stagnation line:…”

Section: B Simplified Formulationmentioning

confidence: 99%

“…Inviscid flow modeling has been carried out by Ruffin [1,2], Josyula et al [3,4], and Giordano et al [5]. Concerning viscous flows, Candler et al [6] and, in particular, the University of Bari (Bari group) carried out a number of simulations under thermochemical nonequilibrium conditions for N 2 =N, O 2 =O, and air mixtures [7][8][9][10][11]. These works, based on the state-to-state formalism, account for the nonequilibrium vibrational kinetics along the stagnation line, applying an accurate kinetic model but solving a simplified set of fluid dynamics equations that are closed using a rough approximation for the transport properties.…”

mentioning

confidence: 98%

State-to-State Simulation of Nonequilibrium Nitrogen Stagnation-Line Flows: Fluid Dynamics and Vibrational Kinetics

Orsini¹,

Rini²,

Taviani³

et al. 2008

Journal of Thermophysics and Heat Transfer

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An advanced model of fluid dynamics and nonequilibrium vibrational-chemical kinetics in high-temperature viscous flows along the stagnation line is proposed. The present model takes into account detailed state-to-state kinetics and state-dependent transport properties. Fluid dynamics equations are self-consistently coupled to vibrational kinetics, and state-dependent transport terms are properly incorporated in the governing equations. As an example, vibrational kinetics, macroscopic flow parameters, and heat transfer in a N 2 =N mixture are calculated for different flow conditions. A comparison with thermal equilibrium and vibrational frozen flows is presented, showing the important role of detailed kinetics coupled to fluid dynamics. Several models of chemical and vibrational kinetics are assessed and a strong dependence of the flow parameters and surface heat flux on the chemical model is demonstrated. Nomenclature c fr p = mixture frozen specific heat at constant pressure D ij = binary diffusion coefficients D = Fick's diffusion coefficient F = reduced tangential velocity, u=u f = stream function g = dimensionless enthalpy, h=h H M=A j;N = state-specific dissociation rate coefficients h i , h = species and mixture enthalpy per unit mass i, j, k = vibrational quantum number or species indices J i = dimensionless mass diffusion flux J y i = mass diffusion flux normal to the body surface K k;l i;j = rate coefficients for vibrational transitions k f=b r = forward/backward chemical reaction rates l 0 = Chapman-Rubesin parameter M i , M = species and mixture molar mass m i = species molecular mass Ns = total number of species (including vibrational levels) Nv = number of vibrational levels n i , n = species and mixture number density Pr = Prandtl number p = mixture pressure q w = surface heat flux r = local body radius S i , S T = source terms in simplified equations Sc = Schmidt number T = gas temperature u = velocity tangential to the body surface V = auxiliary variable in the Lees-Dorodnitsyn transformation v= velocity normal to the body surface _ W i = dimensionless species source term in the bulk _ W cat i = dimensionless species source term at the wall w = parameters at the body surface _ w i = species source term x, y = Cartesian coordinates x i , y i = species molar and mass fractions = parameters at the boundary-layer edge = first Lees-Dorodnitsyn coordinate = reduced temperature, T=T = thermal conductivity coefficient = shear viscosity coefficient 0 ir , 00 ir = stoichiometric coefficients of reactants and products = second Lees-Dorodnitsyn coordinate i , = species and mixture density

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“…The space station Ku-band antenna tracks the geostationary Tracking Data and Relay Satellite (TDRS) and will encounter blockage from the space station structures, especially the solar panels and the thermal radiators, as shown in Fig. 1 1 This conservative approach is based on International Space Station/Shuttle reflector antenna test data. Additional computer simulation and test results indicate that in the near field, the energy radiated by the reflector antenna is mostly confined within the antenna aperture projected cylinder.…”

Section: Introduction T He International Space Station (Iss) Is a Larmentioning

confidence: 99%

“…1 thermal radiator blockage. The data indicate that the ISS Ku-band link can sustain 4.6 dB signal-power-level degradation (relative to the signal power without structure blockage at maximum slant range to TDRS) before the software controller forces the communication link to drop.…”

Section: Introduction T He International Space Station (Iss) Is a Larmentioning

confidence: 99%

Surface Recombination Coefficients and Boundary-Layer Hypersonic-Flow Calculations on Different Surfaces

Armenise

Barbato

Capitelli

et al. 2004

Journal of Spacecraft and Rockets

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Nonequilibrium Vibrational Kinetics of an O/O Mixture Hitting a Catalytic Surface

Cited by 29 publications

References 12 publications

Kinetic description of finite-wall catalysis for monatomic molecular recombination

Kinetic description of finite-wall catalysis for monatomic molecular recombination

State-to-State Simulation of Nonequilibrium Nitrogen Stagnation-Line Flows: Fluid Dynamics and Vibrational Kinetics

Surface Recombination Coefficients and Boundary-Layer Hypersonic-Flow Calculations on Different Surfaces

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