Deposition of a liquid film on non-wetting tubular surfaces gives rise to the unexpected behavior of simultaneously coexisting thick and thin films. Experiments show that a discontinuity in the film thickness, a jump between the thick and thin films being laid from the meniscus towards the bounding moving contact line, occurs after a considerably thicker than the expected Bretherton film is deposited. Bretherton assumed the film to be uniform and, unlike the case of a non-wetting surface, the visco-capillary deposition process was not affected by the presence of a contact line. In reality this phenomenon lies at the confluence between a dewetting process and the deposition itself, being the result of the influence claimed by the dynamics of the zone adjacent to the moving contact line. The film thickness is calculated directly from the experimental data and a correlation is obtained by matching the measured and the theoretical shock velocities associated with the hydraulic jump. The non-wetting film is significantly thicker than Bretherton’s prediction and follows in turn a different law which is determined experimentally. The non-wetting film thickness is found to vary as , being the Ca-dependent non-dimensional Bretherton film thickness.
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ASME 2015 International Mechanical Engineering Congress and Exposition
November 13–19, 2015
Houston, Texas, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5753-3
PROCEEDINGS PAPER
Film Deposition in Non-Wetting Tubes: An Experimental Film Thickness Law
Alexandru Herescu,
Alexandru Herescu
Michigan Technological University, Houghton, MI
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Jeffrey S. Allen
Jeffrey S. Allen
Michigan Technological University, Houghton, MI
Search for other works by this author on:
Alexandru Herescu
Michigan Technological University, Houghton, MI
Jeffrey S. Allen
Michigan Technological University, Houghton, MI
Paper No:
IMECE2015-50217, V010T13A032; 6 pages
Published Online:
March 7, 2016
Citation
Herescu, A, & Allen, JS. "Film Deposition in Non-Wetting Tubes: An Experimental Film Thickness Law." Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition. Volume 10: Micro- and Nano-Systems Engineering and Packaging. Houston, Texas, USA. November 13–19, 2015. V010T13A032. ASME. https://doi.org/10.1115/IMECE2015-50217
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