Experimental and Numerical Investigation of Catalytic Efficiency of Atomic Oxygen Recombination on TPS Surfaces

Osawa, Hiroshi; Suzuki, Toshiyuki; Takayanagi, Hideaki; Mizuno, Masahito; Fujita, Kazuhisa; Sawada, Keisuke

doi:10.2514/6.2009-3934

Cited by 5 publications

(11 citation statements)

References 19 publications

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“…2, the experimental configurations are described briefly here. The schematic of experimental apparatus for the measurement is shown in Fig.…”

Section: Experimental Configurationsmentioning

confidence: 99%

“…Recently, the catalytic efficiency value of the recombination reaction of atomic oxygen occurred at a SiC material surface; O + O → O 2 + 5.08eV (1) was experimentally investigated by Osawa et al 2) In the experiment, oxygen and argon gas mixture was flown into a quartz tube, and was then discharged by supplying a radio-frequency current to an induction coil. The emission intensity ratio of oxygen line to argon line around the test piece was measured during the testing.…”

Section: Introductionmentioning

confidence: 99%

“…The present study aims to analyze the experimental results obtained by Osawa et al 2) For this purpose, a computational code based on direct simulation Monte Carlo (DSMC) technique is developed to calculate the flowfield around the test piece. The electronic excitation of atoms and the catalytic process on the material surface will be modeled in the code.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Suzuki

Osawa

Mizuno

et al. 2010

AEROSPACE TECHNOLOGY JAPAN

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“…2, the experimental configurations are described briefly here. The schematic of experimental apparatus for the measurement is shown in Fig.…”

Section: Experimental Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Suzuki

Osawa

Mizuno

et al. 2010

AEROSPACE TECHNOLOGY JAPAN

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“…The present study aims to analyze the experimental results obtained by Osawa et al [2]. For this purpose, a computational code based on direct simulation Monte Carlo (DSMC) technique, in which fluid flows are modeled using simulation molecules that represent a large number of real molecules in a probabilistic simulation to solve the Boltzmann equation, is developed to calculate the flowfield around the test piece.…”

Section: Introductionmentioning

confidence: 99%

“…O + O → O 2 + 5.08eV (1) was experimentally investigated by Osawa et al [2]. In the experiment, oxygen and argon gas mixture was flown into a quartz tube, and was then discharged by supplying a radio-frequency current to an induction coil.…”

Section: Introductionmentioning

confidence: 99%

Numerical Calculation of Rarefied Oxygen Flow for Surface Catalysis Evaluation

Suzuki

Osawa

Mizuno

et al. 2009

41st AIAA Thermophysics Conference

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Direct simulation Monte Carlo code is developed to study a catalytic process of atomicoxygen on thermal protection material surface. The present method employs the phenomenological electronic excitation model and the heterogeneous catalytic model. Numerical method is applied to simulate the flowfield around a test piece put into the rarefied dissociating oxygen test flow. The calculated number density ratio of oxygen to argon is compared with the measured emission intensity ratio of oxygen line to argon line. The sensitivity analysis is made by varying Eley-Rideal reaction cross section under the several conditions of collisional desorption cross section, sticking coefficient, and total number of surface site. It is found from the study that the probability value of Eley-Rideal reaction for the test piece made of a sintered silicon carbide is about 0.035, while the value of about 0.1 is deduced for the test piece made of copper. Nomenclature f s = flux of species s to the surface, /(m 2 -s) h = Planck constant, 6.626068×10 -34 m 2 kg/s Δh = heat of adsorption, J/mol k = Boltzmann constant, 1.3806×10 -23 J/K k i = rate constant of surface reaction i, m 2 N s = number density of species s, /m 3 n s = surface number density of species s, /m 2 n T = total number of surface sites, /m 2 P = probability of surface events R = universal gas constant, 8.314 J/(mol-K) S 0 = sticking coefficient T = temperature, K 2 Z e-s = relaxation collision number of species s Θ s = surface coverage of species s, n s /n T θ D = debye temperature, K σ = cross section, m 2 subscript a = adsorbed AD = adsorption CD = collisional desorption ER = Eley-Rideal reaction LH = Langmuir-Hinshelwood reaction

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Evaluation of atomic oxygen catalytic coefficient of ZrB₂–SiC by laser-induced fluorescence up to 1473 K

Meng¹,

Zeng²,

Jin³

et al. 2018

Meas. Sci. Technol.

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The atomic oxygen catalytic coefficient, as a key parameter for evaluating the catalytic heat contribution of thermal protection materials, requires thorough and principled experimental studies. In this study, a laboratory-based catalytic coefficient evaluation method based on laser-induced fluorescence diagnosis in radiofrequency inductively coupled plasma and mole fraction gradient theory was investigated. Using this method, the atomic oxygen catalytic coefficients were determined for water-cooled copper, quartz of different temperatures, and, for the first time to our knowledge, ZrB2–SiC ceramics up to 1473 K. The validity of the proposed method is compared with the results from published studies using optical emission spectroscopy and laser-induced fluorescence methods.

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Experimental and Numerical Investigation of Catalytic Efficiency of Atomic Oxygen Recombination on TPS Surfaces

Cited by 5 publications

References 19 publications

Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Numerical Calculation of Rarefied Oxygen Flow for Surface Catalysis Evaluation

Evaluation of atomic oxygen catalytic coefficient of ZrB₂–SiC by laser-induced fluorescence up to 1473 K

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Experimental and Numerical Investigation of Catalytic Efficiency of Atomic Oxygen Recombination on TPS Surfaces

Cited by 5 publications

References 19 publications

Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Numerical Analysis of Rarefied Oxygen Flow around Catalytic Materials

Numerical Calculation of Rarefied Oxygen Flow for Surface Catalysis Evaluation

Evaluation of atomic oxygen catalytic coefficient of ZrB2–SiC by laser-induced fluorescence up to 1473 K

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Evaluation of atomic oxygen catalytic coefficient of ZrB₂–SiC by laser-induced fluorescence up to 1473 K