Marangoni Motion of a Droplet in a Constriction

Nguyen, Vinh T.; Vu, Truong V.; Nguyen, Phan H.; Pham, Binh D.; Nguyen, Hoe D.; Phan, Hoa T.; Vu, Hung V.

doi:10.1007/s12217-022-09958-z

Original Article
Published: 16 May 2022

Marangoni Motion of a Droplet in a Constriction

Vinh T. Nguyen^1,3,
Truong V. Vu ORCID: orcid.org/0000-0001-9440-2091^1,2,
Phan H. Nguyen³,
Binh D. Pham^1,3,
Hoe D. Nguyen^1,3,
Hoa T. Phan⁴ &
Hung V. Vu¹

Microgravity Science and Technology volume 34, Article number: 32 (2022) Cite this article

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Abstract

The present paper focuses on the motion due to the thermocapillary force of a droplet in a circular tube through the front-tracking-based simulation. The tube profile in the axial direction is generated with a sinusoidal function that induces a constriction with depth d at the middle. The droplet is slowed down as it migrates from the cold region (ahead of the constriction) to the hot region in the downstream. Various parameters including the Marangoni number Ma, the capillary number Ca and the depth of the constriction d are varied to better understand the thermocapillary motion of the droplet under the influence of the constriction. The simulation results show that when the Ma number increases, the influence factor of the constriction increases and the migration velocity of the droplet decreases. Increasing the depth of the constriction decreases the migration velocity of the droplet.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 107.03-2019.307. Binh D. Pham was funded by Vingroup JSC and supported by the Master, PhD Scholarship Programme of Vingroup Innovation Foundation (VINIF), Institute of Big Data (VINBIGDATA), code VINIF.2021.TS.090.

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Authors and Affiliations

Faculty of Vehicle and Energy Engineering, Phenikaa University, Yen Nghia, Ha Dong, Hanoi, 12116, Vietnam
Vinh T. Nguyen, Truong V. Vu, Binh D. Pham, Hoe D. Nguyen & Hung V. Vu
A&A Green Phoenix Group, Phenikaa Research and Technology Institute (PRATI), 167 Hoang Ngan, Cau Giay, Hanoi, 11313, Vietnam
Truong V. Vu
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, 10072, Vietnam
Vinh T. Nguyen, Phan H. Nguyen, Binh D. Pham & Hoe D. Nguyen
HaUI Institute of Technology, Hanoi University of Industry (HaUI), Hanoi, 100000, Vietnam
Hoa T. Phan

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Vinh T. Nguyen
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Truong V. Vu
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Phan H. Nguyen
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Binh D. Pham
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Hoe D. Nguyen
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Hoa T. Phan
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V.T. Nguyen was responsible for visualization, investigation, and writing-original draft. T.V. Vu was responsible for conceptualization, methodology, writing-reviewing and editing and supervision. P.H. Nguyen was responsible for supervision. Other authors were responsible for investigation and formal analysis. All authors reviewed the manuscript.

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Correspondence to Truong V. Vu.

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Nguyen, V.T., Vu, T.V., Nguyen, P.H. et al. Marangoni Motion of a Droplet in a Constriction. Microgravity Sci. Technol. 34, 32 (2022). https://doi.org/10.1007/s12217-022-09958-z

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Received: 20 October 2021
Accepted: 10 May 2022
Published: 16 May 2022
DOI: https://doi.org/10.1007/s12217-022-09958-z

Keywords

Droplet
Front-tracking
Thermocapillary motion
Constriction
Simulation