Lattice Boltzmann Simulation of Surface Impingement at High-Density Ratio

    Authors

    X. Gu; A. Gupta;R. Kumar

    Comments

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    Abbreviated Journal Title

    J. Thermophys. Heat Transf.

    Keywords

    INCOMPRESSIBLE 2-PHASE FLOWS; SOLID-SURFACE; DROP IMPACT; MODEL; FLUIDS; WALL; Thermodynamics; Engineering, Mechanical

    Abstract

    In this work, a novel two-phase lattice Boltzmann method has been employed to study droplet impact dynamics in the presence of a surrounding lighter phase. All the simulations were conducted in a three-dimensional Cartesian coordinate system, with the density ratio of the liquid phase to the gas phase fixed at 50. First, simulations of binary droplet collisions are conducted to validate the methodology for 20 < We < 80. Three different types of outcome, namely, coalescence collision, separating collision, and stretching collision, are presented. Secondly, the normal impact of a liquid drop impinging on a perfectly smooth dry surface is simulated at various liquid Weber and Reynolds numbers. Results are shown to compare the spread factor dependence on impact velocity, liquid density, liquid viscosity, surface tension, and surface wetting characteristics. The results are validated with experimental data. Two different outcomes are obtained: deposition and splashing breakup. The transition to splashing is found to be dependent on the liquid Weber and Reynolds numbers.

    Journal Title

    Journal of Thermophysics and Heat Transfer

    Volume

    23

    Issue/Number

    4

    Publication Date

    1-1-2009

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    773

    Last Page

    785

    WOS Identifier

    WOS:000271002100015

    ISSN

    0887-8722

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