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.
|Publication status||Published - 2004|
|Event||8th International Conference on Miniaturised Systems for Chemistry and Life Sciences - Malmö, Sweden|
Duration: 26 Sep 2004 → 30 Sep 2004
Conference number: 8
|Conference||8th International Conference on Miniaturised Systems for Chemistry and Life Sciences|
|Period||26/09/2004 → 30/09/2004|