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    Dynamic Behaviours of Monodisperse Double Emulsion Formation in a Tri-Axial Capillary Device

    Year: 2022

    Journal: Micromachines, Volume 13, NOV

    Authors: Dai, Yuchen; Cha, Haotian; Nguyen, Nhat-Khuong; Ouyang, Lingxi; Galogahi, Fariba; Yadav, Ajeet Singh; An, Hongjie; Zhang, Jun; Ooi, Chin Hong; Nguyen, Nam-Trung

    Organizations: Discovery Project [DP220100261]; ARC DECRA fellowship [DE210100692]; ARC Future Fellowships [FT180100361]; Australian Research Council [DE210100692, FT180100361] Funding Source: Australian Research Council

    Keywords: double emulsion; core-shell droplet; microfluidics; tri-axial capillary; computational fluid dynamics; dripping regime

    We investigated experimentally, analytically, and numerically the formation process of double emulsion formations under a dripping regime in a tri-axial co-flow capillary device. The results show that mismatches of core and shell droplets under a given flow condition can be captured both experimentally and numerically. We propose a semi-analytical model using the match ratio between the pinch-off length of the shell droplet and the product of the core growth rate and its pinch-off time. The mismatch issue can be avoided if the match ratio is lower than unity. We considered a model with the wall effect to predict the size of the matched double emulsion. The model shows slight deviations with experimental data if the Reynolds number of the continuous phase is lower than 0.06 but asymptotically approaches good agreement if the Reynolds number increases from 0.06 to 0.14. The numerical simulation generally agrees with the experiments under various flow conditions.
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