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Surfactant instabilities on thin films

Author(s)
Aessopos, Angelica
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Massachusetts Institute of Technology. Department of Mechanical Engineering.
Advisor
Anette Hosoi.
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M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582
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Abstract
The deposition of a surfactant drop over a thin liquid film may be accompanied by a fingering instability. In this work, we present experimental results which identify the critical parameters that govern the shape and extend of the fingering phenomena. It was found that the normalized wavelength, [lambda]/t, scales with Marangoni number, Ma=[Delta][gamma]t/[mu]D, to the -1 exponent for any Marangoni higher than 4.3 · 10⁷. On the other end, for Marangoni < 4.3 · 10⁷ the normalized wavelength scales with Ma to the -0.4 but becomes in addition a funcion of the Prandtl number, Pr=[upsilon]/D, which demonstrates the critical significance of bulk diffusion on the spreding behavior. Finally, we present a numerical implementation of a mathematical model which is capable of reproducing the experimentally observed trends.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
 
"June 2005."
 
Includes bibliographical references (pages 89-92).
 
Date issued
2005
URI
http://hdl.handle.net/1721.1/88902
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Publisher
Massachusetts Institute of Technology
Keywords
Mechanical Engineering.

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  • Mechanical Engineering - Master's degree
  • Mechanical Engineering - Master's degree

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