Effect of channel width on the primary instability of inclined film flow

A procedure is developed to detect the onset of interfacial instability in inclined film flows (with estimated accuracy better than 5%) and is used to show that the finite width of experimental channels stabilizes the undisturbed liquid film. Deviation from the classical prediction scales inversely...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 22; no. 1; pp. 012106 - 012106-9
Main Authors Vlachogiannis, M., Samandas, A., Leontidis, V., Bontozoglou, V.
Format Journal Article
LanguageEnglish
Published Melville, NY American Institute of Physics 01.01.2010
Subjects
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Interfacial instability
Physics
Rectangular pipe
Test facilities
Travelling waves
Hydrodynamic instability
Disturbances
Free surface flow
Falling film
Experimental study
Inclination
Inclined pipe
Film flow
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Summary:A procedure is developed to detect the onset of interfacial instability in inclined film flows (with estimated accuracy better than 5%) and is used to show that the finite width of experimental channels stabilizes the undisturbed liquid film. Deviation from the classical prediction scales inversely with the product of channel width and sine of inclination angle, and for small inclinations and/or narrow channels is of the order of 100%. The effect is tentatively attributed to the influence of sidewalls on the traveling disturbances, which results in curved crestlines and transverse variation of wave characteristics.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.3294884