Evaluation of free-molecular flow passage conductances with thermal radiation analysis software

Details Evaluation of free-molecular flow passage conductances with thermal radiation analysis software Evaluation of free-molecular flow passage conductances with thermal radiation analysis software

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jspro..23..630p&link_type=abstract

Journal of Spacecraft Rockets (ISSN 0022-4650), vol. 23, Nov.-Dec. 1986, p. 630-634.

Computer Science

Graphics

Computer Programs, Free Molecular Flow, Hubble Space Telescope, Thermal Analysis, Thermal Conductivity, Flow Geometry, Monte Carlo Method, Venting

Scientific paper

This paper describes a methodology for accurately evaluating the conductance of flow passages of virtually any geometry in the free-molecular flow regime. The approach utilizes commonly available thermal analysis software (a thermal radiation interchange factor code such as NEVADA/RENO) thereby avoiding the costly development of specialized software for conductance calculations. Since this software is generally highly developed to include graphics capabilities and large libraries of available surface geometries, complex flow passages can be readily modeled. Thus, a major source of uncertainty in the analysis of rarefied gas flows, namely the evaluation of flow passage conductances, can be eliminated. The validity of this approach is demonstrated by agreement between calculated and experimentally measured conductance values for a variety of different flow passage geometries. Finally, flow passages from the Space Telescope venting analysis are utilized to demonstrate several modeling techniques which may be employed to expedite conductance calculations.

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