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

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

Abstract

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.

Keywords

Nuclear Magnetic Resonance Critical Reynolds Number Nuclear Magnetic Resonance Experiment Velocity Distribution Function Film Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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