Oscillatory accelerations on gas-liquid systems

Details Oscillatory accelerations on gas-liquid systems Oscillatory accelerations on gas-liquid systems

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..504..821w&link_type=abstract

SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM - 2000. AIP Conference Proceedings, Volume 504, pp. 821-827 (2000).

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Interfacial Instabilities, Testing In Microgravity Environments

Scientific paper

We study the stability of liquid-gas interfaces with small density difference, subjected to high frequency vibrations (~60 Hz). We used CO2 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. .

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