Multi-layer film flow down an inclined plane: experimental investigation

D. Henry, J. Uddin, J. Thompson, M. G. Blyth, S. T. Thoroddsen, J. O. Marston*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report the results from an experimental study of the flow of a film down an inclined plane where the film itself is comprised of up to three layers of different liquids. By measuring the total film thickness for a broad range of parameters including flow rates and liquid physical properties, we provide a thorough and systematic test of the single-layer approximation for multi-layer films for Reynolds numbers Re = ρQ/μ≈0.03-60. In addition, we also measure the change in film thickness of individual layers as a function of flow rates for a variety of experimental configurations. With the aid of high-speed particle tracking, we derive the velocity fields and free-surface velocities to compare to the single-layer approximation. Furthermore, we provide experimental evidence of small capillary ridge formations close to the point where two layers merge and compare our experimental parameter range for the occurrence of this phenomenon to those previously reported.

Original languageEnglish
Article number1859
Number of pages14
JournalExperiments in Fluids
Issue number12
Publication statusPublished - 19 Nov 2014


  • Particle Image Velocimetry
  • Incline Plane
  • Film Flow
  • Streamwise Development
  • Total Film Thickness

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • General Physics and Astronomy
  • Fluid Flow and Transfer Processes


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