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Numerical study of the indentation formation of a compound droplet in a constriction

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 th...

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Main Authors:	Nguyen, Hoe D., Vu*, Truong V., Nguyen, Phan H., Pham, Binh D., Ho, Nang X., Nguyen, Cuong T., Nguyen, Vinh T.
Format:	Article
Language:	English
Published:	Journal of Mechanical Science and Technology volume 35, pages1515–1526 (2021) 2021
Subjects:	indentation formation compound droplet
Online Access:	https://link.springer.com/article/10.1007%2Fs12206-021-0316-7 https://dlib.phenikaa-uni.edu.vn/handle/PNK/1432
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spelling	oai:localhost:PNK-14322022-08-17T05:54:42Z Numerical study of the indentation formation of a compound droplet in a constriction Nguyen, Hoe D. Vu*, Truong V. Nguyen, Phan H. Pham, Binh D. Ho, Nang X. Nguyen, Cuong T. Nguyen, Vinh T. indentation formation compound droplet 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 0.2–0.9), the inner-to-outer interfacial tension coefficient ratio σ21 (varied in range of 0.1–6.4), and the normalized depth of the constriction d/R (varied in range of 0.0–0.8). The results reveal that the most influencing factor is Ca, increasing its value leads to the increment of the maximum indentation at the trailing surface of the inner and outer droplets. The indentation is also increased with increasing the value of R10 and d/R. In contrast, increasing R21 results in a decrease in the indentation at the trailing surface of the outer droplet. When increasing σ21, the indentation at the trailing surface of the inner one is quickly suppressed, while the outer droplet is minorly affected. We also point out the patterns of the trailing surface of the inner and outer droplets and their transitions from one to the other patterns in the diagrams based on these parameters. 2021-05-31T08:01:06Z 2021-05-31T08:01:06Z 2021 Article Working Paper https://link.springer.com/article/10.1007%2Fs12206-021-0316-7 https://dlib.phenikaa-uni.edu.vn/handle/PNK/1432 en application/pdf Journal of Mechanical Science and Technology volume 35, pages1515–1526 (2021)
institution	Digital Phenikaa
collection	Digital Phenikaa
language	English
topic	indentation formation compound droplet
spellingShingle	indentation formation compound droplet Nguyen, Hoe D. Vu*, Truong V. Nguyen, Phan H. Pham, Binh D. Ho, Nang X. Nguyen, Cuong T. Nguyen, Vinh T. Numerical study of the indentation formation of a compound droplet in a constriction
description	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 0.2–0.9), the inner-to-outer interfacial tension coefficient ratio σ21 (varied in range of 0.1–6.4), and the normalized depth of the constriction d/R (varied in range of 0.0–0.8). The results reveal that the most influencing factor is Ca, increasing its value leads to the increment of the maximum indentation at the trailing surface of the inner and outer droplets. The indentation is also increased with increasing the value of R10 and d/R. In contrast, increasing R21 results in a decrease in the indentation at the trailing surface of the outer droplet. When increasing σ21, the indentation at the trailing surface of the inner one is quickly suppressed, while the outer droplet is minorly affected. We also point out the patterns of the trailing surface of the inner and outer droplets and their transitions from one to the other patterns in the diagrams based on these parameters.
format	Article
author	Nguyen, Hoe D. Vu*, Truong V. Nguyen, Phan H. Pham, Binh D. Ho, Nang X. Nguyen, Cuong T. Nguyen, Vinh T.
author_facet	Nguyen, Hoe D. Vu*, Truong V. Nguyen, Phan H. Pham, Binh D. Ho, Nang X. Nguyen, Cuong T. Nguyen, Vinh T.
author_sort	Nguyen, Hoe D.
title	Numerical study of the indentation formation of a compound droplet in a constriction
title_short	Numerical study of the indentation formation of a compound droplet in a constriction
title_full	Numerical study of the indentation formation of a compound droplet in a constriction
title_fullStr	Numerical study of the indentation formation of a compound droplet in a constriction
title_full_unstemmed	Numerical study of the indentation formation of a compound droplet in a constriction
title_sort	numerical study of the indentation formation of a compound droplet in a constriction
publisher	Journal of Mechanical Science and Technology volume 35, pages1515–1526 (2021)
publishDate	2021
url	https://link.springer.com/article/10.1007%2Fs12206-021-0316-7 https://dlib.phenikaa-uni.edu.vn/handle/PNK/1432
_version_	1751856293688115200
score	8.8894005

Numerical study of the indentation formation of a compound droplet in a constriction

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