Two-Dimensional Lattice Boltzmann Model for Droplet Impingement and Breakup in Low Density Ratio Liquids

    Authors

    A. Gupta;R. Kumar

    Comments

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    Abbreviated Journal Title

    Commun. Comput. Phys.

    Keywords

    Lattice Boltzmann; droplet impingement; spread factor; breakup; SOLID-SURFACE; IMMISCIBLE DROPLET; BUBBLE DYNAMICS; IMPACT; SIMULATION; FLUIDS; FLOWS; DISPLACEMENT; COLLISION; EQUATION; Physics, Mathematical

    Abstract

    A two-dimensional lattice Boltzmann model has been employed to simulate the impingement of a liquid drop on a dry surface. For a range of Weber number, Reynolds number and low density ratios, multiple phases leading to breakup have been obtained. An analytical solution for breakup as function of Reynolds and Weber number based on the conservation of energy is shown to match well with the simulations. At the moment breakup occurs, the spread diameter is maximum; it increases with Weber number and reaches an asymptotic value at a density ratio of 10. Droplet breakup is found to be more viable for the case when the wall is non-wetting or neutral as compared to a wetting surface. Upon breakup, the distance between the daughter droplets is much higher for the case with a non-wetting wall, which illustrates the role of the surface interactions in the outcome of the impact.

    Journal Title

    Communications in Computational Physics

    Volume

    10

    Issue/Number

    3

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    767

    Last Page

    784

    WOS Identifier

    WOS:000298763800009

    ISSN

    1815-2406

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