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Comparison of kinetic models for atom recombination on high-temperature reusable surface insulationFive kinetic models are compared for their ability to predict recombination coefficients for oxygen and nitrogen atoms over high-temperature reusable surface insulation (HRSI). Four of the models are derived using Rideal-Eley or Langmuir-Hinshelwood catalytic mechanisms to describe the reaction sequence. The fifth model is an empirical expression that offers certain features unattainable through mechanistic description. The results showed that a four-parameter model, with temperature as the only variable, works best with data currently available. The model describes recombination coefficients for oxygen and nitrogen atoms for temperatures from 300 to 1800 K. Kinetic models, with atom concentrations, demonstrate the influence of atom concentration on recombination coefficients. These models can be used for the prediction of heating rates due to catalytic recombination during re-entry or aerobraking maneuvers. The work further demonstrates a requirement for more recombination experiments in the temperature ranges of 300-1000 K, and 1500-1850 K, with deliberate concentration variation to verify model requirements.
Document ID
19930039478
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Willey, Ronald J.
(Northeastern Univ. Boston, MA, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Journal of Thermophysics and Heat Transfer
Volume: 7
Issue: 1
ISSN: 0887-8722
Subject Category
Thermodynamics And Statistical Physics
Accession Number
93A23475
Funding Number(s)
CONTRACT_GRANT: NAG9-314
Distribution Limits
Public
Copyright
Other

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