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B. Duret, T. Menard, F.-X. Demoulin, J. Reveillon

Evaporation of deformed liquid droplets. B. Duret, T. Menard, F.-X. Demoulin, J. Reveillon. Background. Atomization. Evaporation. Dispersed spray. Mixing. Combustion. State of the art : simulation and modelling. DNS [1]. [2]. ?.

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B. Duret, T. Menard, F.-X. Demoulin, J. Reveillon

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  1. Evaporation of deformedliquiddroplets B. Duret, T. Menard, F.-X. Demoulin, J. Reveillon
  2. Background Atomization Evaporation Dispersed spray Mixing Combustion
  3. State of the art : simulation and modelling DNS [1] [2] ? Improveatomizationmodellingwithaccurate DNS isnecessary [1] T. Menard et al, International Journal of Multiphase Flow, 2007. [2] J. Shinjo and A. Unemura, International Journal of Multiphase Flow, 2010.
  4. Evaporation characteristic time Modellingstumbling block
  5. Issues Evaporation Evaporation
  6. ARCHER code [1,2] : DNS/LES, MPI parallelised Level Set/VOF/GhostFluidCoupling, incompressible ARCHER Code Triple diskLiquid Film Rayleigh Taylor [1] S. Tanguy et al, International Journal of Multiphase Flow, 2005. [2] T. Menard et al, International Journal of Multiphase Flow, 2007.
  7. Additionalequations and jump conditions Energy and speciesequations + discontinuities Discontinuous variable Jump Conditions Thermal flux Pressure Velocity Thermal conductivity Specificheat [1] Ishii & Hibiki, Thermo-Fluid dynamics of Two-Phase flows, 2009. [2] Tanguy et al, Journal of ComputationalPhysics, 2007 [3] Calimez, PhDThesis, Ecole Centrale Paris, 1998
  8. Availablenumericalmethods Few studies on vaporization DNS : Schlottke & Weigand [3] Tanguy et al. [1] Gibou et al. [2] VOF Level set [1] Tanguy et al, Journal of ComputationalPhysics, 2007 [2] Gibou et al., Journal of ComputationalPhysics, 2007 [3] Schlottke & Weigand, Journal of ComputationalPhysics, 2008
  9. Chosennumericalmethod Tanguy et al. 2007 Level Set method 2D axisymmetric Implicitresolution of diffusive terms +BC Aslamextrapolation Adams bashford/WENO5 Sequential GhostFluid Projection method Duret, 2013 3D, Parallel Explicit resolution of diffusive terms + BC RK3/WENO5 Conserved New
  10. Validation Velocity jump validation coupledwith NS : Simulation compared to theory (constant vaporization rate)
  11. Validation Error and orderevaluation Order 1 Order 2 Order 3 Nx ° Good grid convergence : 2ndorder
  12. Validation : D2 law The D2lawis one of the few theoreticalresulttakingintoaccount the evaporationprocess Determinationof Y and T theoreticalprofiles [1,2] : [1] D.B. Spalding, 4th symposium on combustion, 1953. [2] R. Borghi and M. Destriau, la combustion et les flammes, 1995.
  13. Validation : D2 law DNS/theorycomparisons Staticdroplet ΔTinit = 520°K
  14. Validation : D2law DNS/theorycomparisons : good agreement T [°K] Yv Numerical Theory R [m] R [m] Our DNS formalismis able to catch the vaporizationprocess
  15. Toward more complex configurations Fallingdropletwith high temperature gradient Initially, Tliq=323°K and Tgaz=873°K
  16. Toward more complex configurations New information available : Temperature gradient inside the droplet Local vaporization rate, deformation
  17. Deformation Same Case but
  18. Conclusion DNS of Heat and mass transfer in two phase flow Access to new informations (, ω(x) …) New (few studies on the subject) Perspective : use DNS as a tool to improvevaporizationmodelling
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