A thermodynamically consistent phase-field model for two-phase flows with thermocapillary effects

Z. Guo, Ping Lin (Lead / Corresponding author)

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    Abstract

    In this paper, we develop a phase-field model for binary incompressible (quasi-incompressible) fluid with thermocapillary effects, which allows for the different properties (densities, viscosities and heat conductivities) of each component while maintaining thermodynamic consistency. The governing equations of the model including the Navier–Stokes equations with additional stress term, Cahn–Hilliard equations and energy balance equation are derived within a thermodynamic framework based on entropy generation, which guarantees thermodynamic consistency. A sharp-interface limit analysis is carried out to show that the interfacial conditions of the classical sharp-interface models can be recovered from our phase-field model. Moreover, some numerical examples including thermocapillary convections in a two-layer fluid system and thermocapillary migration of a drop are computed using a continuous finite element method. The results are compared with the corresponding analytical solutions and the existing numerical results as validations for our model.

    Original languageEnglish
    Pages (from-to)226-271
    JournalJournal of Fluid Mechanics
    Volume766
    DOIs
    Publication statusPublished - Mar 2015

    Keywords

    • Two-phase flows
    • Phase-field method
    • thermocapillary effects
    • thermodynamic consistency
    • entropy generation
    • quasi-incompressible

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