Analysis of Accommodation Coefficients of Noble Gases on Aluminum Surface with an Experimental/Computational Method (Postprint)

Abstract

A technique is proposed to assess gas-surface accommodation coefficients. The technique utilizes the fact that radiometric forces exerted on heated objects immersed in rarefied gases are governed by the interaction of gas molecules with the surface. In the present implementation, it connects measurements of radiometric forces on a heated vane in the transitional flow regime with the kinetic modeling of the flow, and derives the accommodation coefficients through the successive analysis of measured and computed results. A new combined ES-BGK / DSMC approach that allows accurate and time efficient analysis of radiometric forces on a vane in large vacuum chambers filled with rarefied gas is presented. Accommodation coefficients for the Maxwell model are estimated for argon, xenon, and helium on a machined aluminum surface, and found to be 0.81, 0.86, and 0.53, respectively.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2009
Accession Number
ADA528072

Entities

People

  • Andrew D. Ketsdever
  • Natalia Gimelshein
  • Nathaniel Selden
  • Sergey F. Gimelshein

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Boundary Layer
  • Coefficients
  • Computational Fluid Dynamics
  • Computational Science
  • Fluid Dynamics
  • Gas Dynamics
  • Gas Flow
  • Heat Transfer
  • Measurement
  • Molecular Dynamics
  • Rarefied Gas Dynamics
  • Rarefied Gases
  • Spacecraft
  • Surface Temperature
  • Thermal Conductivity
  • Vacuum Chambers

Fields of Study

  • Physics

Readers

  • Aerospace Propulsion Engineering.
  • Fluid Dynamics.