Experimental evidence for a short-wave global mode in film flow along periodic corrugations
dc.creator | Cao, Z. | en |
dc.creator | Vlachogiannis, M. | en |
dc.creator | Bontozoglou, V. | en |
dc.date.accessioned | 2015-11-23T10:24:19Z | |
dc.date.available | 2015-11-23T10:24:19Z | |
dc.date.issued | 2013 | |
dc.identifier | 10.1017/jfm.2012.612 | |
dc.identifier.issn | 0022-1120 | |
dc.identifier.uri | http://hdl.handle.net/11615/26507 | |
dc.description.abstract | The primary instability of liquid film flow along periodically corrugated substrates is studied experimentally. Two different wall shapes, of the same wavelength and height, are tested for a wide range of inclinations. It is found that, beyond a specific inclination, a new instability mode occurs before the classical, convective, long-wave one. This is a short, travelling wave, which is highly regular and persistently two-dimensional, and appears to be a global mode. The exact shape of the corrugations has a leading-order effect on the inclination at which the new mode appears and on its wavelength at inception. Compared with the behaviour of film flow on a flat substrate, the presently tested periodic walls are found to delay very significantly, but each one to a different extent, the onset of the primary instability. This delay increases with inclination, and presents a distinct discontinuity when transition from the long-to the short-wave mode takes place. | en |
dc.source | Journal of Fluid Mechanics | en |
dc.source.uri | <Go to ISI>://WOS:000314643700012 | |
dc.subject | thin films | en |
dc.subject | waves/free-surface flows | en |
dc.subject | THIN LIQUID-FILMS | en |
dc.subject | VISCOUS FILMS | en |
dc.subject | SURFACE | en |
dc.subject | WALL | en |
dc.subject | TOPOGRAPHY | en |
dc.subject | STABILITY | en |
dc.subject | INERTIA | en |
dc.subject | INSTABILITIES | en |
dc.subject | EVOLUTION | en |
dc.subject | INCLINE | en |
dc.subject | Mechanics | en |
dc.subject | Physics, Fluids & Plasmas | en |
dc.title | Experimental evidence for a short-wave global mode in film flow along periodic corrugations | en |
dc.type | journalArticle | en |
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