The coupling between mass transfer and hydrodynamic phenomena in two-phase flow is not necessarily straightforward due to the different effects that can be encountered. The treatment of such coupling is complex and requires particular efforts, especially in the modelling of the interface between phases. In this paper, we consider the case of a droplet composed of two components (one miscible and one immiscible in water) released in a 2D rectangular domain filled with water. Mass transfer occurs between the miscible element and the surrounding water, which leads to a density inversion that directly affects the droplet trajectory through buoyancy. We perform simulations using a ternary Cahn-Hilliard model (implemented in the "phase\_field" model of the TrioCFD code) to capture such coupled phenomena. The Boussinesq approximation for a multicomponent system is used to define the density law and an analytical chemical potential is proposed for the thermodynamic landscape. The effect of the mobility parameter on the flow is highlighted and the results found are in good agreement with the dynamics described from an experimental study of the open literature.
A Sharp and Conservative VOF Method for Multicomponent Liquid--Gas Mass Transfer: Bubble Dissolution and Droplet Evaporation
School of Engineering Science, University of Chinese Academy of Sciences（中国科学院大学工程科学学院）；Institute of Applied Physics and Computational Mathematics（应用物理与计算数学研究所）；State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University（西安交通大学航空航天学院机械结构强度与振动国家重点实验室）
On the role of water activity on the formation of a protein-rich coffee ring in an evaporating multicomponent drop
Carlos III University of Madrid（马德里卡洛斯三世大学）；Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas CSIC（西班牙国家生物技术中心，西班牙高等科学研究理事会）
A quantitative comparison of physical accuracy and numerical stability of Lattice Boltzmann color gradient and pseudopotential multicomponent models for microfluidic applications
