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  • 1
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    Dynamics of rotating and oscillating drops (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The dynamics of rotation and oscillation is investigated of a freely suspended liquid drop under the influence of surface tension and positioned inside an experimental apparatus by acoustic forces in the low acceleration environment of Spacelab 3. After a drop was observed to be spherical and stably located at the center of the chamber, it was set into rotation or oscillation by acoustic torque or modulated radiation pressure force.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Marshall Space Flight Center Spacelab 3 Mission Science Review; p 27-30
    Format: application/pdf
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  • 2
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    Spacelab 3 drop dynamics experiments (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Positioning techniques using the effects of acoustic-radiation pressure were used during the Spacelab 3 flight to carry out classical fluid dynamics experiments on liquid drops freely suspended in microgravity. Quantitative results dealing with the equilibrium shapes of acoustically rotated drops, with the response to the radiation pressure forces, and finally with the experimental measurement of surface tension have been obtained.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 86-0196
    Format: text
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  • 3
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    Non-axisymmetric shapes of a rotating drop in an immiscible system (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The nonaxisymmetric shapes of a rotating drop in an immiscible system were studied. Five basic families of shapes (axisymmetric, two-lobed, three-lobed, four-lobed, and toroidal) were observed. The sequence (axisymmetric to two-lobed to three-lobed to four-lobed to toroidal) seems to be linked to increasing spin-up velocity. For the axisymmetric case, direct comparisons of experiments with the theory of a free rotating drop were surprisingly good the equatorial area differs from theory by only 30%. Furthermore, the non-axisymmetric shapes are in good qualitative agreement with the theory, although the theory does not address the presence of an outer fluid.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Proc. of the 2d Intern. Colloq. on Drops and Bubbles; p 203-213
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  • 4
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    Acoustically induced oscillation and rotation of a large drop in space (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A 2.5 cm diameter water drop was successfully deployed and manipulated in a triaxial acoustic resonance chamber during a 240 sec low-gravity SPAR rocket flight. Oscillation and rotation were induced by modulating and phase shifting the signals to the speakers. Portions of the film record were digitized and analyzed. Spectral analysis brought out the n = 2, 3, 4 free oscillation modes of the drop, its very low-frequency center-of-mass motion in the acoustic potential well, and the forced oscillation frequency. The drop boundaries were least-square fitted to general ellipses, providing eccentricities of the distorted drop. The normalized equatorial area of the rotating drop was plotted vs a rotational parameter, and was in excellent agreement with values derived from the theory of equilibrium shapes of rotating liquid drops.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Proc. of the 2d Intern. Colloq. on Drops and Bubbles; p 31-38
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  • 5
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    Acoustic rotation control (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A system is described for acoustically controlled rotation of a levitated object, which avoids deformation of a levitated liquid object. Acoustic waves of the same wavelength are directed along perpendicular directions across the object, and with the relative phases of the acoustic waves repeatedly switched so that one wave alternately leads and lags the other by 90 deg. The amount of torque for rotating the object, and the direction of rotation, are controlled by controlling the proportion of time one wave leads the other and selecting which wave leads the other most of the time.
    Keywords: ACOUSTICS
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  • 6
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    Rotating Liquid Drops: Plateaus Experiment Revisited (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The dynamics of liquid drops rotating in another liquid were studied experimentally with an oil drop suspended in a neutral buoyancy tank. New stable shapes not predicted by the theory were observed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-163745 , JPL-PUB-80-66
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  • 7
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    Stabilized Acoustic Levitation of Dense Materials Using a High-Powered Siren (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Stabilized acoustic levitation and manipulation of dense (e.g., steel) objects of 1 cm diameter, using a high powered siren, was demonstrated in trials that investigated the harmonic content and spatial distribution of the acoustic field, as well as the effect of sample position and reflector geometries on the acoustic field. Although further optimization is possible, the most stable operation achieved is expected to be adequate for most containerless processing applications. Best stability was obtained with an open reflector system, using a flat lower reflector and a slightly concave upper one. Operation slightly below resonance enhances stability as this minimizes the second harmonic, which is suspected of being a particularly destabilizing influence.
    Keywords: ACOUSTICS
    Type: NASA-CR-170124 , NAS 1.26:170124 , JPL-PUB-82-92
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  • 8
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    Development of the Optical Communications Telescope Laboratory: a Laser Communications Relay Demonstration Ground Station (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Optics
    Type: International Conference on Service Oriented Computing; Nov 12, 2012 - Nov 15, 2012; Shanghai; China
    Format: text
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