Wierschem A, Pollak T, Heining C, Aksel N (2010)
Publication Type: Journal article, Original article
Publication year: 2010
Publisher: American Institute of Physics (AIP)
Book Volume: 22
Pages Range: 113603
Journal Issue: 11
URI: http://link.aip.org/link/doi/10.1063/1.3522861
DOI: 10.1063/1.3504374
We study inertial film flow down undulated inclines. With increasing Reynolds number, eddies are formed in the troughs of the bottom undulation. Further increase leads to a diminution of the eddies until they vanish completely. At even higher Reynolds numbers, they reappear yielding an eddy-free window of Reynolds numbers. Within this window, the free-surface shape changes abruptly. The change comes along with a sudden decrease in the mean film thickness and an abrupt transition of the surface shape type from anharmonic with a strong indentation to harmonic. The anharmonic surface shape shows typical features of a hydraulic jump, which vanishes during the transition. We find that the eddies disappear at Reynolds numbers where the first harmonic of the free-surface contour is sufficiently strong regardless of the exact surface shape. Numerical calculations are in good agreement with the experimental findings. © 2010 American Institute of Physics.
APA:
Wierschem, A., Pollak, T., Heining, C., & Aksel, N. (2010). Suppression of eddies in films over topography. Physics of Fluids, 22(11), 113603. https://doi.org/10.1063/1.3504374
MLA:
Wierschem, Andreas, et al. "Suppression of eddies in films over topography." Physics of Fluids 22.11 (2010): 113603.
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