Variation of Momentum Accommodation Coefficients with Molecular Mass and Structure

Michael Martin, Tathagata Acharya

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


A disk spindown experiment allows measurement of tangential momentum accommodation coefficients (TMAC) of different gases and material combinations in a consistent manner. A range of gases: monoatomic, diatomic, and triatomic are tested on aluminum. The results confirm previous experimental results that show a reduction in tangential momentum accommodation coefficients with increasing molecular masses of gases. In addition, the results reveal a previously unreported phenomenon: that the tangential momentum accommodation coefficient is also a function of molecular structure of gases.

Original languageAmerican English
StatePublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: 7 Jan 201911 Jan 2019


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego

Bibliographical note

Publisher Copyright:
© 2019 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

NREL Publication Number

  • NREL/CP-2C00-74479


  • gas flow
  • gases
  • momentum


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