Influence of capillarity and gravity on confined faraday waves
Answers
A set of experiments are presented that characterize Faraday waves in confined systems operating under special regimes of diminishing capillarity and gravity. While the reduction in interfacial tension was achieved through thermal control of a novel binary liquids system, the low gravity condition was realized in a parabolic flight environment. Under terrestrial conditions, gravity was found to influence the evolution of instabilities more at lower frequencies, whereas interfacial tension dominates at higher frequencies. The asymptotic behaviour of the system becomes more stabilised near the consolute temperature even though one would expect enhanced instability in such cases. This was observed to result from the reduction in critical wavelength that, in turn, leads to an increase in the viscous dissipation. Interestingly, the opposite effect was observed when gravity was eliminated from the consideration even though the corresponding reduction in wavelength was quite drastic. This destabilization is attributed to the density stratification of the fluid arrangement.
☞Capillarity☜
Capillarity, rise or depression of a liquid in a small passage such as a tube of small cross-sectional area, like the spaces between the fibres of a towel or the openings in a porous material. ...
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