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Molecular and continuum simulation of binary gas mixture flow through curved miconozzles

Darbandi, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.2514/6.2018-4184
  3. Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA , 2018
  4. Abstract:
  5. In this study, multi-component CFD and DSMC solvers are used to study the gas mixture flow through a separation micronozzle at different pressure ratios. The resulting velocity and mole fraction fields, which are predicted by these solvers, are compared with each other to examine the effects of flow rarefaction on the mixture flow and the species separation and to evaluate the validity of continuum flow theory provided by the CFD solver. The results indicate good agreement of the velocity and mole fraction fields in the regions in which the pressure is sufficiently high. A decrease in pressure value, which is the result of increasing the pressure ratio at a constant inlet pressure, and a decrease in the channels width would enhance the rarefaction effects and increase the differences between the results of two solvers. At high pressure ratios, the CFD solver predicts higher velocity values, which in turn result in more severe variation of species mole fractions. The current results show that the validity of continuum theory prediction for the mole fraction field (compared with the velocity field) is more prone to be deteriorated by the rarefaction effects. © 2018 by G.E. Schneider. Published by the American Institute of Aeronautics and Astronautics, Inc
  6. Keywords:
  7. Continuum mechanics ; Gas mixtures ; Gases ; Heat transfer ; High pressure effects ; Velocity ; Binary gas mixture ; Continuum simulations ; Continuum theory ; Different pressures ; Gas mixture flows ; High pressure ratio ; Inlet pressures ; Pressure values ; Computational fluid dynamics
  8. Source: 12th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, 2018, 25 June 2018 through 29 June 2018 ; 2018 ; 9781624105524 (ISBN)
  9. URL: https://arc.aiaa.org/doi/abs/10.2514/6.2018-4184