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Molecular tagging velocimetry in rarefied and confined gas flows

Abstract : Molecular tagging velocimetry (MTV) is an optic experimental technique widely employed for measuring the velocity field in fluid flows. The measuring principle is based on the tracking of molecules able to emit light in response to a laser excitation. By seeding the flow with this tracer, local velocity measurements can be carried out by following the displacement of the emitting molecules. While this technique has already been successfully applied in liquid and gas flows, the application to rarefied and confined gas flows is still a challenge due to the high molecular diffusion and the low emitted light from the tracer at low pressures. The interest in applying MTV in rarefied conditions derives from the absence of local experimental data that can allow a better understanding on the mechanisms of interaction between the gas molecules and the wall surface. In this work, an experimental analysis of the intensity and lifetime of the photoluminescence of the molecular tracers employed, i.e., acetone and diacetyl, is presented. This analysis allowed to estimate the best working conditions in order to be able to apply MTV to rarefied gas flows. Thus, MTV has been applied to gas-tracer mixtures at low pressures in a millimetric rectangular channel producing the first preliminary results in the slip flow regime.
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Submitted on : Tuesday, April 14, 2020 - 12:23:07 PM
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2019DominiqueFratantonio.pdf
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  • HAL Id : tel-02541973, version 1

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Dominique Fratantonio. Molecular tagging velocimetry in rarefied and confined gas flows. Mechanics of the fluids [physics.class-ph]. INSA de Toulouse, 2019. English. ⟨NNT : 2019ISAT0027⟩. ⟨tel-02541973⟩

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