Large concentration changes due to thermal diffusion effects in gas flow microsystems with temperature gradients

Ulrich Quaade, Tue Johannessen, Søren Jensen, Ole Hansen

Research output: Contribution to conferencePosterResearch

Abstract

Thermal diffusion, or Sorét diffusion, is shown to cause significant concentration changes and transients in gas flow microsystems with temperature gradients. In a silicon microsystem, a temperature gradient of about 100 oC/mm is measured to produce concentration transients of up to 13.7 % in an argon/helium mixture, when the flow is abruptly changed from a high value to a low value. Finite element simulations of the thermal diffusion in a geometry similar to the experimental setup reproduce the measurements.
Original languageEnglish
Publication date2004
Publication statusPublished - 2004
Event8th International Conference on Miniaturised Systems for Chemistry and Life Sciences - Malmö, Sweden
Duration: 26 Sep 200430 Sep 2004
Conference number: 8

Conference

Conference8th International Conference on Miniaturised Systems for Chemistry and Life Sciences
Number8
CountrySweden
CityMalmö
Period26/09/200430/09/2004

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