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Physics of Fluids / Volume 24 / Issue 2 / ARTICLES / Interfacial Flows

Phys. Fluids 24, 022106 (2012); http://dx.doi.org/10.1063/1.3684706 (18 pages)

Measurements of liquid film thickness for a droplet at a two-fluid interface

G. Oldenziel, R. Delfos, and J. Westerweel

Laboratory for Aero and Hydrodynamics, Leeghwaterstraat 21 2628 CA Delft, The Netherlands

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(Received 12 July 2011; accepted 16 December 2011; published online 14 February 2012)

Coalescence of a droplet at a two-fluid interface is studied at Bond numbers larger than one and at three different values of the viscosity ratio. Both the thickness of the liquid film between the rising droplet and the two-fluid interface, and the location of film rupture are measured using laser induced fluorescence. Particle image velocimetry was applied to the flow in the film. It is found that the film thins asymetrically, and that the time interval between collision and film rupture is shorter than predicted by commonly used models. The film ruptures at an off-center location. It can be concluded that asymmetric film drainage speeds up coalescence.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL APPROACH
    1. Side view LIF measurements
    2. Top view LIF measurements
    3. Top view PIV measurements
  3. RESULTS
    1. Side view LIF measurements
    2. Top view LIF measurements
    3. Top view PIV measurements
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

drops, film flow, flow visualisation, fluorescence, liquid films, two-phase flow, viscosity

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3684706

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    R. Davis, J. Schonberg, and J. Rallison, “The lubrication force between two viscous drops,” Phys. Fluids A 1, 77 (1989)PFADEB000001000001000077000001.


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