Using Cahn-Hilliard mobility to simulate coalescence dynamics

作者：Dupuy Pablo M^*; Fernandino Maria; Jakobsen Hugo A; Svendsen Hallvard F

来源：Computers & Mathematics with Applications, 2010, 59(7): 2246-2259.

DOI：10.1016/j.camwa.2009.08.050

• Lattice Boltzmann equation
• Two-phase flow
• High density ratio
• Interface
• Chemical potential
• Diffuse interface model

In droplet-droplet collision processes, such as bouncing and coalescence, the following stages can be identified: droplet approach, film drainage, film rupture and the hydrodynamics of coalescence driven by capillary forces. The film rupture process represents a remaining challenge for numerical models intended to simulate the outcome of collisions. It has been proposed that the lattice Boltzmann framework has a mesoscale nature that is suitable for modeling of film rupture. The present work examines diffuse coalescence based on the Cahn-Hilliard free energy for non-uniform systems. No empirical coalescence criterion is needed as the diffuse mechanism is based on a thermodynamic description with its own time characteristics.

• 出版日期2010-4