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Transient Fluted Films behind Falling Water Columns.

Abhijit K Kushwaha1, Matthew B Jones2, Jesse Belden3

  • 1King Abdullah University of Science and Technology, Mechanical Engineering, Physical Science and Engineering, (KAUST), Thuwal 23955, Saudi Arabia.

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|June 23, 2025
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Summary
This summary is machine-generated.

Water draining from tubes forms complex films. We used high-speed imaging and modeling to understand how fluid forces create different film shapes and predict when they break, aiding in industrial applications.

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Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Multiphase systems

Background:

  • Draining columns of water in vertical tubes can leave intricate, axisymmetric liquid films.
  • The diverse morphologies of these fluted films are not fully understood.

Purpose of the Study:

  • To investigate the formation and breakup dynamics of fluted liquid films trailing from vertical tubes.
  • To classify observed film behaviors into distinct regimes based on characteristic timescales.
  • To develop a theoretical framework predicting film behavior and transitions.

Main Methods:

  • High-speed imaging to capture film dynamics.
  • First-principles modeling to analyze fluid forces.
  • Analysis of characteristic timescales for film emergence, retraction, and rupture.

Main Results:

  • Demonstrated that film morphology arises from the balance of inertia, surface tension, gravity, and viscous forces.
  • Classified observed behaviors into distinct regimes and predicted transitions between them.
  • Developed a theoretical framework accurately capturing transient film velocity and thickness at the tube exit.

Conclusions:

  • The study explains the complex fluid dynamics of draining films in vertical tubes.
  • Provides insights into film stability, merging, and rupture processes.
  • Relevant to applications like falling film evaporators, coating flows, and capillary-inertial instabilities.