Full Content is available to subscribers

Subscribe/Learn More  >

Rarefaction and Compressibility Effects on Steady or Transient Gas Flows in Microchannels

[+] Author Affiliations
Stéphane Colin

Institut National des Sciences Appliquées, Toulouse Cedex, France

Paper No. ICMM2004-2316, pp. 13-24; 12 pages
  • ASME 2004 2nd International Conference on Microchannels and Minichannels
  • ASME 2nd International Conference on Microchannels and Minichannels
  • Rochester, New York, USA, June 17–19, 2004
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4164-2
  • Copyright © 2004 by ASME


An analysis of the different significant length scales allows us to show the major part played by rarefaction in gas microflows, and the different flow regimes encountered in microchannels. The main theoretical and experimental results from the literature about steady pressure-driven gas microflows are summarized. Because it is very frequent in microchannels, the slip flow regime is more detailed and the question of appropriate choice of boundary conditions is discussed. It is shown that using second-order boundary conditions allows us to extend the applicability of the slip flow regime to higher Knudsen numbers that are usually relevant to transition regime. The case of pulsed flows is also presented, for this kind of flow is frequently encountered in micropumps. The influence of slip on the frequency behavior (pressure gain and phase) of microchannels is illustrated. When subjected to sinusoidal pressure fluctuations, microdiffusers reveal a diode effect which depends on the frequency. This diode effect may be reversed, when the depth is shrunk from a few hundred to a few micrometers. Thermally driven flows in microchannels are also described. They are particularly interesting for vacuum generation, using microsystems without moving parts.

Copyright © 2004 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In