Tangential momemtum accommodation in microtube

Timothée Ewart (1) , Pierre Perrier (1) , Irina Graur (1) , J. Gilbert Méolans (1)

1 IUSTI - Institut universitaire des systèmes thermiques industriels

Experimental investigations of isothermal steady flows for various gases have been carried out in a silica micro tube. This study is focused on the mass flow rate measurements of these flows in slip regime using a suitable powerful platform. First we analyse, for each gas, the pertinence of a first or second order continuum treatment ; then we deduce from experiments, using the appropriate treatment, the tangential momentum accommodation coefficient (TMAC) of each gas. The TMAC obtained for the various pairs of gas (nitrogen, argon, helium)/surface (fused silica) exclude a full diffuse reflection.

Mots clés: Microscale flows; Mass transfer; Micro fluidics; Pressure measurements; Wall interactions

Domaines: Sciences de l'ingénieur [physics]

Timothée Ewart, Pierre Perrier, Irina Graur, J. Gilbert Méolans. Tangential momemtum accommodation in microtube. Microfluidics and Nanofluidics, 2007, 3, pp.689 - 695. ⟨10.1007/s10404-007-0158-3⟩. ⟨hal-01443359⟩