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Numerical Simulation of Turbulent Spray Flows Using Transported PDF Methods

[+] Author Affiliations
Yong Hu, Eva Gutheil

University of Heidelberg, Heidelberg, Germany

Paper No. FEDSM2014-22038, pp. V01DT26A008; 10 pages
doi:10.1115/FEDSM2014-22038
From:
  • ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1D, Symposia: Transport Phenomena in Mixing; Turbulent Flows; Urban Fluid Mechanics; Fluid Dynamic Behavior of Complex Particles; Analysis of Elementary Processes in Dispersed Multiphase Flows; Multiphase Flow With Heat/Mass Transfer in Process Technology; Fluid Mechanics of Aircraft and Rocket Emissions and Their Environmental Impacts; High Performance CFD Computation; Performance of Multiphase Flow Systems; Wind Energy; Uncertainty Quantification in Flow Measurements and Simulations
  • Chicago, Illinois, USA, August 3–7, 2014
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4624-7
  • Copyright © 2014 by ASME

abstract

This paper presents a numerical study of a turbulent acetone spray flow, where the gas phase model includes a transported joint probability density function (PDF) of the gas phase velocity and the mixture fraction. This approach greatly benefits from the fact that the spray evaporation rate appears in closed form, and no additional modeling is required, whereas the molecular mixing requires closure. This is achieved through use of the extended interaction-by-exchange-with-the-mean (IEM) model with an additional term to account for spray evaporation. The dispersed liquid phase is described through a Lagrangian discrete parcel method with a point-source approximation. For droplet evaporation, an equilibrium model is compared with a more advanced non-equilibrium model. Numerical results of droplet size as well as mean and fluctuating velocities are presented and discussed in comparison with experimental results from the literature, and good agreement is observed. The non-equilibrium model predicts somewhat slower spray evaporation compared with the equilibrium model.

Copyright © 2014 by ASME

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