NDLI: Role of diffusion on molecular tagging velocimetry technique for rarefied gas flow analysis

Content Provider	Springer Nature Link
Author	Colin, Stéphane Si Hadj Mohand, Hacene Barrot, Christine Frezzotti, Aldo
Copyright Year	2015
Abstract	The molecular tagging velocimetry (MTV) is a well-suited technique for velocity field measurement in gas flows. Typically, a line is tagged by a laser beam within the gas flow seeded with light emitting acetone molecules. Positions of the luminescent molecules are then observed at successive times and the velocity field is deduced from the analysis of the tagged line displacement and deformation. However, the displacement evolution is expected to be affected by molecular diffusion, when the gas is rarefied. Therefore, there is no direct and simple relationship between the velocity field and the measured displacement of the initial tagged line. This paper addresses the study of tracer molecules diffusion through a background gas flowing in a channel delimited by planar walls. Tracer and background species are supposed to be governed by a system of coupled Boltzmann equations, numerically solved by the direct simulation Monte Carlo (DSMC) method. Simulations confirm that the diffusion of tracer species becomes significant as the degree of rarefaction of the gas flow increases. It is shown that a simple advection–diffusion equation provides an accurate description of tracer molecules behavior, in spite of the non-equilibrium state of the background gas. A simple reconstruction algorithm based on the advection–diffusion equation has been developed to obtain the velocity profile from the displacement field. This reconstruction algorithm has been numerically tested on DSMC generated data. Results help estimating an upper bound on the flow rarefaction degree, above which MTV measurements might become problematic.
Ending Page	1348
Page Count	14
Starting Page	1335
File Format	PDF
ISSN	16134982
e-ISSN	16134990
Journal	Microfluidics and Nanofluidics
Issue Number	6
Volume Number	19
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biomedical Engineering Direct simulation Monte Carlo Analytical Chemistry Molecular tagging velocimetry Nanotechnology and Microengineering Engineering Fluid Dynamics Microflows
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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