A new DNS formalism dedicated to turbulent two-phase flows with phase change
نویسندگان
چکیده
Phase change in multiphase flows occurs many natural and industrial applications, e.g., rain formation, internal combustion engines, heat exchangers, reactors, etc. In dense two-phase flows, quantitative experimental results are scarce due to the complexity of configuration techniques limitations. Hence, interest direct numerical simulation such has grown recently better understand access data this kind flows. When simulating phase advanced method needed consider jump conditions at interface, ensure mass, energy, momentum species conservation. literature, problem is mainly investigated with an incompressible formalism. However, assumption not longer suitable for enclosed environment or atomized/aerated The purpose work present a formalism dedicated turbulent two including acoustics compressible effects proper treatment interface change. To achieve task, first, level-set vaporizing proposed by Tanguy et al. (2007) revisited adapted mass conservative representation: Coupled Level-set/Volume Fluid method. context, evaporating static cylinder constant vaporization rate droplet (D2 law) have been performed as validation cases. Both cases illustrate accuracy robustness presence velocity discontinuities Stefan flow. D2 law used implementation transfer transport equations their coupling evaporation flow dynamic. Then, extended using framework pressure based Duret (2018). main advantage ability effects, variable density multiple gas inclusions its own thermodynamic pressure. A modified Volume equation presented, compressibility effects. Navier–Stokes solved assumptions. case studied quantify conservation properties between phases. Finally, 3D Homogeneous Isotropic Turbulence (HIT) presented demonstrate potential breakup, encapsulation, coalescence processes.
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ژورنال
عنوان ژورنال: International Journal of Multiphase Flow
سال: 2021
ISSN: ['1879-3533', '0301-9322']
DOI: https://doi.org/10.1016/j.ijmultiphaseflow.2021.103762