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Measurements of tangential momentum accommodation coefficient for various gases in plane microchannel

Phys. Fluids 21, 102004 (2009); doi:10.1063/1.3253696

Published 30 October 2009

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I. A. Graur, P. Perrier, W. Ghozlani, and J. G. Méolans
Département de Mécanique Energétique-UMR CNRS 6595, Université de Provence-Ecole Polytechnique Universitaire de Marseille, 5 rue Enrico Fermi, 13453 Marseille Cedex 13, France
Mass flow rate measurements in a single silicon microchannel were carried out for various gases in isothermal steady flows. The results obtained from hydrodynamic to near free molecular regime by using a powerful experimental platform allowed us to deduce interesting information, notably about the reflection/accommodation process at the wall. In the 0–0.3 Knudsen range, a continuum analytic approach was derived from the NS equations, associated with first or second order slip boundary conditions. Identifying the experimental mass flow rate curves to the theoretical ones the tangential momentum accommodation coefficient (TMAC) of various gases was extracted. Over the full Knudsen range [0–30] the experimental results were compared with theoretical values calculated from the kinetic approaches: using variable accommodation coefficient values as fitting parameter, the theoretical curves were fitted to the experimental ones. Whatever the Knudsen range and whatever the theoretical approach, the TMAC values are found decreasing when the molecular weights of the gas increase (as long as the different gases are compared using the same approach). Moreover, the values of the various accommodation coefficients are rather close to one another but sufficiently smaller than unity indicating that the full accommodation modeling is not satisfactory to describe the gas/wall interaction. ©2009 American Institute of Physics
History: Received 3 March 2009; accepted 18 September 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/102004/1
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KEYWORDS and PACS

Keywords
PACS
  • 47.60.Dx
    Flows in ducts and channels
  • 47.61.-k
    Micro- and nano-scale flow phenomena
  • 47.45.Gx
    Slip flows and accomodation in fluid dynamics
  • 47.10.ad
    Navier-Stokes equations
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-6631 (print)   1089-7666 (online)
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REFERENCES (29)
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