Abstract
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.
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Acknowledgments
This work was supported by the European Research Council (ERC) Advanced Grant No. 291094-ELBM and the ETH Research Grant ETH35-12-2. Computational resources at the Swiss National Super Computing Center, CSCS, were provided under the Grant S492 .
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Mazloomi Moqaddam, A., Chikatamarla, S.S. & Karlin, I.V. Simulation of Droplets Collisions Using Two-Phase Entropic Lattice Boltzmann Method. J Stat Phys 161, 1420–1433 (2015). https://doi.org/10.1007/s10955-015-1329-3
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DOI: https://doi.org/10.1007/s10955-015-1329-3