Velocity field measurements in gas phase internal flows by molecular tagging velocimetry

Samouda, F.; Brandner, Juergen J.; Barrot-Lattes, Christine; Colin, Stéphane

doi:10.1088/1742-6596/362/1/012026

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…On the other hand, the first attempts to measure gas flows velocities by MTV inside devices with millimetric or sub-millimetric dimensions are quite recent and the techniques were based on MTV by direct phosphorescence using acetone as tracer molecule [44,55,56] or on MTV by photoproduct fluorescence using nitric oxide as tracer molecule [57]. These few preliminary measurements have been made in rectangular channels using one dimensional molecular tagging velocimetry (1D-MTV); in this case a single line or a series of parallel lines are tagged perpendicularly to the flow direction ( Fig.…”

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confidence: 99%

Molecular tagging velocimetry by direct phosphorescence in gas microflows: Correction of Taylor dispersion

Mohand

Frezzotti

Brandner

et al. 2017

Experimental Thermal and Fluid Science

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Molecular tagging velocimetry is a little-intrusive technique based on the properties of specific molecules able to emit luminescence once properly excited. Several variants of this technique have been successfully developed for analyzing external gas flows or internal gas flows in large systems. There is, however, very few experimental data on molecular tagging velocimetry for gas flows in mini or microsystems, and these data are strongly affected by the molecular diffusion of the tracer molecules. In the present paper, it is demonstrated that the velocity field in gas microflows cannot be directly deduced from the measured displacement field without taking into account Taylor dispersion effects. For that purpose, the benchmark case of a Poiseuille gas flow through a rectangular channel 960 µm in depth is experimentally investigated by micro molecular tagging velocimetry using acetone vapor as a molecular tracer. An appropriate reconstruction method based on the advection diffusion equation is used to process the data and to correctly extract the velocity profiles. The comparison of measured velocities with flowrate data and with theoretical velocity profiles shows a good agreement, whereas when the reconstruction method is not implemented, the extracted velocity field exhibits qualitative and quantitative anomalies, such as a non-physical slip at the walls. The robustness of the reconstruction method is demonstrated on flows with light and heavy molecular species, namely helium and argon, at atmospheric as well as at 2 lower pressure conditions, for which diffusion effects are stronger. The obtained results represent an encouraging step for future analysis of rarefied gas microflows.

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confidence: 99%

Molecular tagging velocimetry by direct phosphorescence in gas microflows: Correction of Taylor dispersion

Mohand

Frezzotti

Brandner

et al. 2017

Experimental Thermal and Fluid Science

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show abstract

“…The gas was nitrogen seeded with acetone, and the spatial resolution was around 10 μm, with a maximal uncertainty of 5% for a Knudsen number between 0.002 and 0.035, that is, in the slip flow regime. Recently, first velocity fields have been successfully measured in millimetric channels in nonrarefied regimes (Samouda et al, 2012).…”

Section: Flow Visualizationmentioning

confidence: 99%

Single-Phase Gas Flow in Microchannels

Colin¹

2014

Heat Transfer and Fluid Flow in Minichannels and Microchannels

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Acetone photophysics at 282 nm excitation at elevated pressure and temperature. I: absorption and fluorescence experiments

et al. 2017

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Velocity field measurements in gas phase internal flows by molecular tagging velocimetry

Cited by 6 publications

References 17 publications

Molecular tagging velocimetry by direct phosphorescence in gas microflows: Correction of Taylor dispersion

Molecular tagging velocimetry by direct phosphorescence in gas microflows: Correction of Taylor dispersion

Single-Phase Gas Flow in Microchannels

Acetone photophysics at 282 nm excitation at elevated pressure and temperature. I: absorption and fluorescence experiments

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