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Comparative study between computational and experimental results for binary rarefied gas flows through long microchannels

Microfluidics and Nanofluidics volume 9, pages 1103–1114 (2010)Cite this article

Abstract

A comparative study between computational and experimental results for pressure-driven binary gas flows through long microchannels is performed. The theoretical formulation is based on the McCormack kinetic model and the computational results are valid in the whole range of the Knudsen number. Diffusion effects are taken into consideration. The experimental work is based on the Constant Volume Method, and the results are in the slip and transition regime. Using both approaches, the molar flow rates of the He–Ar gas mixture flowing through a rectangular microchannel are estimated for a wide range of pressure drops between the upstream and downstream reservoirs and several mixture concentrations varying from pure He to pure Ar. In all cases, a very good agreement is found, within the margins of the introduced modeling and measurement uncertainties. In addition, computational results for the pressure and concentration distributions along the channel are provided. As far as the authors are aware of, this is the first detailed and complete comparative study between theory and experiment for gaseous flows through long microchannels in the case of binary mixtures.

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Acknowledgment

The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no 215504.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Thessaly, 38334, Pedion Areos, Volos, Greece

    Lajos Szalmas & Dimitris Valougeorgis

  2. INSA, UPS, Mines Albi, ISAE, ICA (Institut Clément Ader), Université de Toulouse, 135 avenue de Rangueil, 31077, Toulouse, France

    Jeerasak Pitakarnnop, Sandrine Geoffroy & Stephane Colin

Authors
  1. Lajos Szalmas
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  2. Jeerasak Pitakarnnop
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  3. Sandrine Geoffroy
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  4. Stephane Colin
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  5. Dimitris Valougeorgis
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Correspondence to Dimitris Valougeorgis.

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Szalmas, L., Pitakarnnop, J., Geoffroy, S. et al. Comparative study between computational and experimental results for binary rarefied gas flows through long microchannels. Microfluid Nanofluid 9, 1103–1114 (2010). https://doi.org/10.1007/s10404-010-0631-2

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  • DOI: https://doi.org/10.1007/s10404-010-0631-2

Keywords

  • Binary rarefied gas flows
  • McCormack model
  • Discrete velocity method
  • Flow rate measurement

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