Ternary free-energy entropic lattice Boltzmann model with high density ratio

Wöhrwag, Moritz, Semprebon, Ciro, Moqaddam, Ali Mazloomi, Karlin, Ilya and Kusumaatmaja, Halim (2018) Ternary free-energy entropic lattice Boltzmann model with high density ratio. Physical Review Letters, 123 (23). p. 234501. ISSN 0031-9007

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Abstract

A thermodynamically consistent free energy model for fluid flows comprising of one gas and two liquid components is presented and implemented using the entropic lattice Boltzmann scheme. The model allows high-density ratio, up to of order O(10³), between the liquid and gas phases; and a broad range of surface tension ratios, covering partial wetting states where Neumann triangles are formed, and full wetting states where complete encapsulation of one of fluid components is observed. We further demonstrate that we can capture the bouncing, adhesive and insertive regimes for the binary collisions between immiscible droplets suspended in air. Our approach opens up a vast range of multiphase flow applications involving one gas and several liquid components.

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