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. A criterion is proposed to predict the onset of shear-driven film separation from the surface at an expanding corner. The criterion 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 that the gas phase impacts the separation process only through its effect on the liquid film momentum.
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Research Papers
A Separation Criterion With Experimental Validation for Shear-Driven Films in Separated Flows
M. A. Friedrich,
M. A. Friedrich
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
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H. Lan,
H. Lan
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
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J. L. Wegener,
J. L. Wegener
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
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J. A. Drallmeier,
J. A. Drallmeier
Department of Mechanical and Aerospace Engineering,
e-mail: drallmei@mst.edu
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
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B. F. Armaly
B. F. Armaly
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
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M. A. Friedrich
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
H. Lan
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
J. L. Wegener
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050
J. A. Drallmeier
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050e-mail: drallmei@mst.edu
B. F. Armaly
Department of Mechanical and Aerospace Engineering,
Missouri University of Science and Technology
, 400 West 13th Street, Rolla, MO 65409-0050J. Fluids Eng. May 2008, 130(5): 051301 (9 pages)
Published Online: April 25, 2008
Article history
Received:
July 31, 2007
Revised:
February 4, 2008
Published:
April 25, 2008
Citation
Friedrich, M. A., Lan, H., Wegener, J. L., Drallmeier, J. A., and Armaly, B. F. (April 25, 2008). "A Separation Criterion With Experimental Validation for Shear-Driven Films in Separated Flows." ASME. J. Fluids Eng. May 2008; 130(5): 051301. https://doi.org/10.1115/1.2907405
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