Two- and three-dimensional waves in falling film flow in the nonlaminar flow regime: an NMR study

  • C. Heine
  • S. Stapf
  • B. Blümich


Nuclear magnetic resonance (NMR) velocity-encoded imaging results as well as propagators are presented for the nonlaminar flow regime of falling films. The film is generated by a continuous flow of silicon oil along a vertical poly(methyl methacrylate) plate. While the film remains purely laminar for a film Reynolds number Ref=0.5, it exhibits laminar-wavy behavior for 1.0≤Ref≤2.5. In this range, a laminar residual film can be distinguished from averaged waves near the surface of the film from measurements of the flow velocity ν2 along the direction of gravity as a function of the coordinatex normal to the plate. The perpendicular velocity components, ν x and ν y are zero within the accuracy of the measurement, indicating that the wave motion is two-dimensional in the laminar-wavy case. For higher Ref the waves are found to be three-dimensional, a straightforward division into a residual film and waves in ν z is lost and the waves extend over the whole thickness of the film.


Nuclear Magnetic Resonance Critical Reynolds Number Nuclear Magnetic Resonance Experiment Velocity Distribution Function Film Flow 
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Copyright information

© Springer 2002

Authors and Affiliations

  • C. Heine
    • 1
  • S. Stapf
    • 1
  • B. Blümich
    • 1
  1. 1.Institut für Technische Chemie und Makromolekulare ChemieRheinisch-Westfälische Technische Hochschule AachenAachenGermany

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