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A multi-core compound droplet passing through a diffuser channel

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Abstract

This study’s aim is to improve the understanding of the dynamical behavior of a multi-core compound droplet traveling in an axisymmetric channel consisting of a diffuser element. The compound droplet typically consisting of two inner droplets distributed one after another is initially located at a certain distance from the entrance of the channel. A front-tracking method is used to handle the movement and deformation of the droplet. The numerical simulation results show that the compound droplet is stretched in the channel, and it takes a certain time, “the transit time”, to pass through the diffuser. The compound droplet has the largest deformation in the diffuser region and tends to return to its nearly original shape after leaving the diffuser. The deformation and transit time of the compound droplet are affected by some typical parameters, such as the capillary number and the diffuser angle. For small capillary numbers, the leading inner droplet takes a shorter transit time than the rear one does. The transit time also increases with an increase in the diffuser angle and the number of inner droplets enclosed in the compound droplet.

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Acknowledgments

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number: 13/2019/TN.

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Authors and Affiliations

  1. Institute for Control Engineering and Automation, Hanoi University of Science and Technology, 01 Dai Co Viet, Hanoi, Vietnam

    Dang T. Bui & Quang D. Nguyen

  2. School of Electrical Engineering, Hanoi University of Science and Technology, 01 Dai Co Viet, Hanoi, Vietnam

    Dang T. Bui & Quang D. Nguyen

  3. School of Transportation Engineering, Hanoi University of Science and Technology, 01 Dai Co Viet, Hanoi, Vietnam

    Hung V. Vu

  4. Faculty of Vehicle and Energy Engineering, Phenikaa University, Hanoi, Vietnam

    Truong V. Vu

  5. Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi, Vietnam

    Truong V. Vu

Authors
  1. Dang T. Bui
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  2. Hung V. Vu
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  3. Quang D. Nguyen
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  4. Truong V. Vu
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Corresponding author

Correspondence to Truong V. Vu.

Additional information

Dang T. Bui is an Associate Professor and a Lecturer at Hanoi University of Science and University (HUST). He received his Master’s in Instrumentation and Control from Hanoi University of Science and Technology (HUST), Vietnam, in 2011, and Ph.D. from Ecole Normale Superieure de Cachan, France, in 2011. His main research interests include numerical simulations (CFD), control system design, embedded systems and AI, IoT for smart agriculture.

Truong V. Vu is a Lecturer in the Faculty of Vehicle and Energy Engineering, Phenikaa University, Hanoi, Vietnam. He received his Ph.D. in Integrated Science and Engineering from Ritsumeikan University, Japan. His research interests include multiphase and free surface flows, phase change heat transfer and numerical methods.

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Bui, D.T., Vu, H.V., Nguyen, Q.D. et al. A multi-core compound droplet passing through a diffuser channel. J Mech Sci Technol 35, 5049–5060 (2021). https://doi.org/10.1007/s12206-021-1022-1

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  • DOI: https://doi.org/10.1007/s12206-021-1022-1

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