Study reveals faster migration of composite droplets in three-phase flow systems, suggesting engineering improvements.
In practical engineering applications, the phenomenon of bubbles/composite droplets passing through complex structures in a gas–liquid–liquid three-phase flow system is widespread. In the microchannel immersion radiators, the composite droplets formed by boiling discrete phase droplets in a gas–water–fluoride three-phase flow pass through the porous throat's process. The porous throat structures within immersed radiators significantly influence composite droplets dynamics in the three-phase systems. This study utilizes the large density ratio three-phase flow lattice Boltzmann flux solver to investigate the dynamic characteristics of composite droplets passing through the porous throat. The model's reliability in accurately capturing the three-phase interface and simulating the movement of bubbles is verified through liquid lens examples. The study further explores the influence of three-phase flow parameters on composite droplets behavior, migration velocity, and position. The results demonstrate that, for the same Eötvös number, the composite droplet migrates faster in the three-phase system. The larger three-phase density ratios, lower viscosity ratios, and the presence of a surrounding liquid film all contribute to enhanced composite droplet migration.
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Zhang et al. (2025) studied this question.
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