Skip to Main content Skip to Navigation
Journal articles

Velocity measurements in channel gas flows in the slip regime by means of molecular tagging velocimetry

Abstract : Direct measurements of the slip velocity in rarefied gas flows produced by local thermodynamic non-equilibrium at the wall represent crucial information for the validation of existing theoretical and numerical models. In this work, molecular tagging velocimetry (MTV) by direct phosphorescence is applied to argon and helium flows at low pressures in a 1-mm deep channel. MTV has provided accurate measurements of the molecular displacement of the gas at average pressures of the order of 1 kPa. To the best of our knowledge, this work reports the very first flow visualizations of a gas in a confined domain and in the slip flow regime, with Knudsen numbers up to 0.014. MTV is cross-validated with mass flowrate measurements by the constant volume technique. The two diagnostic methods are applied simultaneously, and the measurements in terms of average velocity at the test section are in good agreement. Moreover, preliminary results of the slip velocity at the wall are computed from the MTV data by means of a reconstruction method.
Document type :
Journal articles
Complete list of metadata

Cited literature [32 references]  Display  Hide  Download
Contributor : Stéphane Colin Connect in order to contact the contributor
Submitted on : Thursday, April 2, 2020 - 2:46:32 PM
Last modification on : Friday, August 5, 2022 - 11:43:07 AM


Publisher files allowed on an open archive



Dominique Fratantonio, Marcos Rojas-Cárdenas, Christine Barrot, Lucien Baldas, Stéphane Colin. Velocity measurements in channel gas flows in the slip regime by means of molecular tagging velocimetry. Micromachines, MDPI, 2020, 11 (4), pp.374. ⟨10.3390/mi11040374⟩. ⟨hal-02529688⟩



Record views


Files downloads