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Simulation of Droplets Collisions Using Two-Phase Entropic Lattice Boltzmann Method

Mazloomi Moqaddam, A. ; Chikatamarla, S. ; Karlin, I.

In: Journal of Statistical Physics, 2015, vol. 161, no. 6, p. 1420-1433

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    Titre
    • Simulation of Droplets Collisions Using Two-Phase Entropic Lattice Boltzmann Method
    Auteur
    • Mazloomi Moqaddam, A.. Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
    • Chikatamarla, S.. Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
    • Karlin, I.. Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Statistical Physics, 2015, vol. 161, no. 6, p. 1420-1433. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:332572
    Summary
    The recently introduced entropic lattice Boltzmann model for multiphase flows (Mazloomi et al. in Phys Rev Lett 114:174502, 2015) is used to simulate binary droplet collisions. The entropy-based stabilization, together with a new polynomial equation of state, enhances performance of the model and allow us to simulate droplet collision for various Weber and Reynolds numbers and large liquid to vapor density ratio. Different types of droplet collision outcomes, namely coalescence, stretching separation and reflexive separation are recovered in a range of impact parameter for two equal sized droplets. The results demonstrated the essential role played by the surface tension, kinematic viscosity, impact parameter and relative velocity in the droplet collision dynamics leading to coalescence or separation collision outcomes. Comparison between numerical results and experiments in both coalescence and separation collisions demonstrate viability of the presented model.