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    • Numerical study of the indentation formation of a compound droplet in a constriction
    Authors: Nguyen, Hoe D.; Vu*, Truong V.; Nguyen, Phan H.; Pham, Binh D.; Ho, Nang X.; Nguyen, Cuong T.; Nguyen, Vinh T.;  Advisor: -;  Co-Author: - (2021)

    A compound droplet deforming in a constricted tube widely appears in drug delivery and microfluidic devices. In such a constriction, an indentation can present at the trailing surface of the droplet. However, this aspect has not been fully investigated and understood so far. This study focuses on the effects of some dimensionless parameters on the negative curvature, i.e., indentation, at the trailing surface of a compound droplet moving through a constricted tube. The presence of the constriction at the middle of the tube length enhances the droplet indentation. Numerical results were obtained for the capillary number Ca (varied in range of 0.1–1.0), the inner-to-outer droplet radius ratio R21 (varied in range of 0.2–0.9), the droplet-to-tube radius ratio R10 (varied in range of 0....