Diffusion effects on the determination of surface catalysis in Inductively Coupled Plasma facility

Viladegut, Alan; Düzel, Ümran; Chazot, Olivier

doi:10.1016/j.chemphys.2017.02.002

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…In fact, consistently with the first order reaction hypothesis, only surface temperature is normally considered to define the catalytic reaction rates. However, results previously obtained in this thesis, and in Ref [41,42,[107][108][109]. show that the recombination coefficient determination in plasma wind tunnels is influenced by both pressure and boundary layer chemical non-equilibrium conditions around a sample.…”

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confidence: 64%

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Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Farran¹

2018

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My wish is that the reader enjoys this dissertation and that it brings him/her a better understanding on Gas-Surface Interaction (GSI) phenomena. Nonetheless, this journey through the VKI doctoral program has been long, and I wouldn't be able to address this topic without acknowledging people that were by my side during this research, because without them this thesis would not have been possible: A big thank to Olivier Chazot for giving me the opportunity to develop my thesis in the Plasmatron facility. His office was always open and ready for discussion. A special mention to his telephone, most of the time ringing during each one of our conversations. Also to Roberto Flores, director of this thesis in UPC, who allowed me to keep in contact with my university. Following the experimental nature of this dissertation, I would like to mention also the contribution made by Pascal Collin. He did an excelent job running the Plasmatron and installing the probes. I will always remember his desperation when water leaks appear when making the vacuum in the chamber. I thank also the rest of the Plasmatron team: Bernd Helber and Damien Le Quang as radiation experts, and Işil Şakraker as advisor for calorimetric measurements. Many CFD simulations appear in this dissertaion. For that, the advice of Vincent Van Der Haegen, my office mate, has been extremely useful to achieve a converged solution. Also, the flight extrapolation technique developed here deserves my gratitude to Fabio Pinna, whose expertise in CFD helped me to improve my IXV simulations and achieve the "Pinna Certification". I really enjoyed working with them. Other VKI colleagues I want to mention are Alessandro Turchi, who helped me understand many aspects of GSI phenomena, Francesco Panerai who set the basis to develop this dissertation, and Georgios Bellas-Chatzigeordis to whom I encourage to continue with the catalytic model development and implementation in VKI numerical tools. Last but not least, special thanks to my family. They encouraged me to pursue a doctorate degree and supported me in the most difficult moments.

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confidence: 64%

“…5.5 according to a reference flat plate model of 20 cm. This reference length is taken because it is representative of the flat plate model mentioned above, which has been extensively used in the VKI-Plasmatron [11,106,108,109,112].…”

Section: Scale Effectmentioning

confidence: 99%

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Farran¹

2018

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“…Nonetheless, the model has some drawbacks. Even though the γ parameter should depend only on the material properties (e.g., roughness) and its surface temperature [21], it has been observed experimentally that it depends explicitly on pressure [22] and the degree of chemical nonequilibrium in the boundary [23,24].…”

Section: Introductionmentioning

confidence: 99%

Energy Accommodation Coefficient Calculation Methodology Using State-to-State Catalysis Applied to Hypersonic Flows

2020

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The interplay of a gas-surface interaction and thermal nonequilibrium is still an open problem in aerothermodynamics. In the case of reusable thermal protection systems, it is unclear how much of the recombination energy is stored internally in the molecules produced by surface catalytic reactions, potentially leading to nonequilibrium between their translational and internal energy modes. A methodology is developed to calculate the energy accommodation coefficient using a rovibrational state-to-state chemical mechanism for a nitrogen mixture coupled with a generalized form of the catalytic recombination coefficient. The flow around a spherical body is simulated in hypersonic conditions, allowing study of the amount of energy deposited on the surface and stored in the recombining molecules. Internal energy quenching into translational energy is found, which is a phenomenon also observed experimentally, keeping the total energy transferred to the surface overall constant. The methodology developed for the application of a state-to-state model in the computational fluid dynamics framework coupled with catalysis is generic and applicable to a variety of other similar mechanisms.

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Experimental methodology for the accurate stochastic calibration of catalytic recombination affecting reusable spacecraft TPS

2022

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Diffusion effects on the determination of surface catalysis in Inductively Coupled Plasma facility

Cited by 13 publications

References 23 publications

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Energy Accommodation Coefficient Calculation Methodology Using State-to-State Catalysis Applied to Hypersonic Flows

Experimental methodology for the accurate stochastic calibration of catalytic recombination affecting reusable spacecraft TPS

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