Masters Theses


"The behavior of a shear-driven thin liquid film at a sharp expanding corner is of interest in many engineering applications. However, details of the interaction between inertial, surface tension, and gravitational forces at the corner that result in partial or complete separation of the film from the surface are not clear. The focus of this study was to develop a criterion to predict the onset of shear-driven film separation from the surface at an expanding corner as well as to develop a film thickness measurement technique that could be used to obtain an average film thickness for input into the film separation model. The criterion is proposed and is validated with experimental measurements of the percent of film mass separated as well as comparisons to other observations from the literature. The results show that the proposed force ratio correlates well to the onset of film separation over a wide range of experimental test conditions. The correlation suggests the gas phase impacts the separation process only through its effect on the liquid film momentum"--Abstract, page iv.


Drallmeier, J. A.

Committee Member(s)

Kohser, Ronald A.
Armaly, B. F. (Bassem F.)


Mechanical and Aerospace Engineering

Degree Name

M.S. in Mechanical Engineering


National Science Foundation (U.S.)


Missouri University of Science and Technology

Publication Date

Spring 2008

Journal article titles appearing in thesis/dissertation

  • Measurement of the mean film thickness of dynamic shear-driven thin liquid films using optical interferometry
  • Separation criterion with experimental validation for shear-driven films in separated flows


xiv, 110 pages


© 2008 Mark Allan Friedrich, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Liquid films
Thin films -- Mechanical properties
Two-phase flow -- Measurement

Thesis Number

T 9339

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