Oscillatory accelerations on gas-liquid systems

Wunenburger, Re´gis; Beysens, Daniel; Lecoutre-Chabot, Carole; Garrabos, Yves; Evesque, Pierre; Fauve, Stephan
January 2000
AIP Conference Proceedings;2000, Vol. 504 Issue 1, p821
Academic Journal
We study the stability of liquid-gas interfaces with small density difference, subjected to high frequency vibrations (∼60 Hz). We used CO[sub 2] slightly below its critical point in order to vary in a scaled way the density difference and interfacial tension of the vapor and liquid via temperature. When the direction of vibrations is parallel to the interface, above a given velocity threshold an interface instability is observed, with the interface modulated as a “frozen” wave pattern. It is found that the wavelength and the amplitude of the stationary wave-like profile are both increasing functions of the frequency and amplitude of the vibration, and that they are proportional to the capillary length. Our measurements are consistent with a model of inviscid and incompressible flow averaging the effect of the vibration over a period and leading to a Kelvin-Helmholtz-like instability mechanism due to the two fluids relative motion. Under zero gravity (experiment onboard MiniTEXUS 5 ESA sounding rocket in Feb. 98), we observe that gas and liquid phases become structured into alternate layers perpendicular to the vibration. Preliminary results on the formation of alternate layers , and the influence of the vibrational parameters on the characteristic features of the multilayered structure are reported. The periodic acceleration seems to act as an “artificial” gravity. © 2000 American Institute of Physics.


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