4.6 Article

Investigation of flow dynamics of thin viscous films down differently shaped fibers

Journal

APPLIED PHYSICS LETTERS
Volume 119, Issue 20, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0069189

Keywords

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Funding

  1. National Natural Science Foundation of China [11802066, 12162011, 51766002]
  2. Guangxi Natural Science Foundation [2018GXNSFAA281331, 2018 GXNSFBA138058]
  3. Guangxi Science and Technology Project [AD18281042, ZY20198017]
  4. Innovation Project of Guangxi Graduate Education [2020YCXS002, YCSW2021173, 2021YCXS013]

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This paper investigates the flow behaviors of a thin film falling on differently shaped fibers, finding that flow on a spiral fiber is more stable and has a wider range of flow rates compared to a cylindrical fiber, allowing for more precise control of flow patterns. The study quantitatively examines characteristic parameters of flow dynamics on a spiral fiber and discovers higher bead velocity, larger bead thickness, and larger bead spacing on a thin film on a spiral fiber. These findings provide important insights for understanding and potentially improving coating flow control methods in various applications.
The flow dynamics of a thin viscous film down on a fiber is associated with a variety of industrial applications. In this paper, we experimentally investigate the flow behaviors of a thin film falling on differently shaped fibers. For a spiral fiber, flow behaviors show three typical flow regimes as the cylindrical fiber, which indicates the isolated regime, Rayleigh-Plateau regime, and convective regime. However, the transition process of various fiber shapes is distinctively different. Unlike the cylindrical fiber, flow on a spiral fiber exhibits a wider range of flow rate in the Rayleigh-Plateau regime, which is helpful for the precise control of flow patterns in a relatively stable regime. We further quantitatively investigate three important characteristic parameters of flow dynamics of a spiral fiber, i.e., bead velocity, thickness, and spacing. Results reveal that a thin film on a spiral fiber has a higher bead velocity, larger bead thickness, and larger bead spacing. Our findings provide important insights for understanding flow dynamics of a thin viscous film down on shaped fibers, which may also inspire coating flow control methods in various applications.

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