Predicting the runback threshold for liquid drops in aerodynamic boundary layers is a challenging problem with numerous applications including aircraft icing simulations. The critical parameters that govern drop runback are investigated in this experiment by using a wind tunnel that provides a turbulent accelerated flow similar to flows near an unswept wing’s leading edge. The experiments feature water drops on aluminum with a contact angle of . Results show that significant water∕air interface unsteadiness precedes drop runback. This is likely due to air-flow separation in the drop wakes. For displacement-thickness-scaled Reynolds numbers ranging from 348 to 429, a constant-Weber-number runback threshold is found to adequately correlate the runback results.
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June 2008
Research Papers
A Runback Criterion for Water Drops in a Turbulent Accelerated Boundary Layer
Edward B. White,
Edward B. White
Department of Aerospace Engineering,
Texas A&M University
, College Station, TX 77840
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Jason A. Schmucker
Jason A. Schmucker
Department of Aerospace Engineering,
Texas A&M University
, College Station, TX 77840
Search for other works by this author on:
Edward B. White
Department of Aerospace Engineering,
Texas A&M University
, College Station, TX 77840
Jason A. Schmucker
Department of Aerospace Engineering,
Texas A&M University
, College Station, TX 77840J. Fluids Eng. Jun 2008, 130(6): 061302 (6 pages)
Published Online: May 19, 2008
Article history
Received:
June 22, 2007
Revised:
March 10, 2008
Published:
May 19, 2008
Citation
White, E. B., and Schmucker, J. A. (May 19, 2008). "A Runback Criterion for Water Drops in a Turbulent Accelerated Boundary Layer." ASME. J. Fluids Eng. June 2008; 130(6): 061302. https://doi.org/10.1115/1.2917429
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