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Evaporation Modeling for Polydisperse Spray in Turbulent Flow

  • Mouldi ChriguiEmail author
  • Fernando Sacomano
  • Amsini Sadiki
  • Assaad R. Masri
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 19)

Abstract

Based on an overview of existing vaporization models, a suggestion for capturing phase transition in a turbulent two phase flow is made. Focus is put on the Uniform Temperature Model (UTM). Comparison between equilibrium and non-equilibrium evaporation models to experimental data is highlighted. Two configurations with different fuels, i.e. different thermodynamic properties, are investigated and the results of both models are validated with the measurements. The configurations exhibit completely different boundary conditions and polydisperse turbulent multiphase flows with different classes and probability distribution of the droplet diameters. Large eddy simulation (LES) and Reynolds averaged numerical simulation (here RANS) models are used to capture the turbulence. In both configurations, results show that non-equilibrium effects influence the vaporization significantly. The UTM with the extension of non-equilibrium, by Langmuir and Knudsen, capture the vaporization well, whereas the equilibrium model over-predicts the volume flux of the liquid phase, i.e. the vaporization process is developing slower in case of equilibrium model. Worth to notice that the mean droplet diameter is between 20 and 40 µm. Thus the ratio of surface to volume is important if compared to larger droplets. Non-equilibrium effects are then correspondingly important and the equilibrium model is not able to describe the phase transition process well.

Keywords

Large Eddy Simulation Carrier Phase Droplet Diameter Sherwood Number Droplet Evaporation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Mouldi Chrigui
    • 1
    • 2
    Email author
  • Fernando Sacomano
    • 1
  • Amsini Sadiki
    • 1
  • Assaad R. Masri
    • 3
  1. 1.Department of Mechanical Engineering, Institute for Energy and Powerplant TechnologyTechnische Universität DarmstadtDarmstadtGermany
  2. 2.Research Unit Materials, Energy and Renewable EnergiesUniversity of GafsaGafsaTunisia
  3. 3.School of Aerospace, Mechanical and Mechatronic EngineeringThe University of SydneySydneyAustralia

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