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  • Other Sources  (6)
  • FLUID MECHANICS AND HEAT TRANSFER  (4)
  • GEOPHYSICS  (2)
  • 1
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    Drop coalescence in zero-gravity environment of Skylab IV (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A series of experiments in cloud physics and fluid mechanics at near zero-gravity environment were made during NASA's Skylab IV mission. Color photographs taken aboard demonstrate the impaction and coalescence of two water drops of equal diameter and different color. Plans for a zero-gravity cloud physics laboratory for the Space Shuttle are indicated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: American Meteorological Society; vol. 55
    Format: text
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  • 2
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    Nighttime/daytime optical survey of lightning and convective phenomena experiment (NOSL) (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Nighttime/Daytime Optical Survey of Lightning experiment was selected for flight on Orbital Flight Test 2 of the Space Shuttle. The background and rationale for the experiment are presented and the experiment hardware, the operating procedures, and the data analysis technique are discussed. Some preliminary results from the prototype hardware development are also presented.
    Keywords: GEOPHYSICS
    Type: NASA-TM-78261
    Format: application/pdf
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  • 3
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    An analysis of oscillations of a water droplet under low gravity conditions (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: JPL Proc. of the Intern. Colloq. on Drops and Bubbles, Vol. 2; p 617-628
    Format: text
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  • 4
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    Skylab fluid mechanics demostration - A study of water droplet oscillations in space (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In the Skylab experiment a drop of water was caused to oscillate at its natural oscillation frequency. The drop was observed until its oscillation began to decay due to its internal damping. A determination of the change in amplitude with time made it possible to verify the applicability of a theoretical model. The fundamental concept of the model is that fluid surfaces tend to an equilibrium shape produced by the balance of the forces of fluid pressure and surface tension. The theoretical model is based on the assumption that the wave amplitude is small compared with the wavelength.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Conference on Cloud Physics; Oct 21, 1974 - Oct 24, 1974; Tucson, AZ
    Format: text
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  • 5
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    A zero-gravity demonstration of the collision and coalescence of water droplets (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The mechanics of the collision and coalescence of liquid droplets is one of the main research areas in the fields of nuclear physics, astrophysics, meteorology and fluid mechanics. The crew members on the Skylab 3 and 4 missions were requested to perform demonstrations of the collision and coalescence of water droplets under the low gravity environment at orbital altitude. In Skylab 4 two water droplets with equal volumes, 30 cu cm each, were used. A dark colored droplet (contaminated with grape drink) moving with a velocity of 3.14 cm/sec collided with a stationary pink colored droplet (contaminated with strawberry drink) and coalescence occurred. Theoretical models are proposed to study the various stages of the collision-coalescence processes. Special considerations are concentrated in the investigation of the bounce-coalescence and coalescence-instability processes. The surface tension of the coalesced droplets was calculated to be 52 dynes/cm in perfect agreement with laboratory measurements made after the flight using a reproduction of the liquids.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 74-1256
    Format: text
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  • 6
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    Lightning induced brightening in the airglow layer (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This report describes a transient luminosity observed at the altitude of the airglow layer (about 95 km) in coincidence with a lightning flash in a tropical oceanic thunderstorm directly beneath it. This event provides new evidence of direct coupling between lightning and ionospheric events. This luminous event in the ionosphere was the only one of its kind observed during an examination of several thousand images of lightning recorded under suitable viewing conditions with Space Shuttle cameras. Several possible mechanisms and interpretations are discussed briefly.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 99-102
    Format: text
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