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  • 11
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    Charged particle concepts for fog dispersion (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Charged particle techniques hold promise for dispersing warm fog in the terminal area of commercial airports. This report focuses on features of the charged particle technique which require further study. The basic physical principles of the technique and the major verification experiments carried out in the past are described. The fundamentals of the nozzle operation are given. The nozzle characteristics and the theory of particle charging in the nozzle are discussed, including information from extensive literature on electrostatic precipitation relative to environmental pollution control and a description of some preliminary reported analyses on the jet characteristics and interaction with neighboring jets. The equation governing the transfer of water substances and of electrical charge is given together with a brief description of several semi-empirical, mathematical expressions necessary for the governing equations. The necessary ingredients of a field experiment to verify the system once a prototype is built are described.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-3440
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    Influence of solidification on surface tension driven convection (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The effect of solidification on the onset of surface tension driven convection in a reduced gravity environment is studied. Two simple but physically realistic configurations representing the solidification of a simple material are analyzed. The analysis shows that as a result of the solidification process the critical Marangoni number is shifted to lower values indicating that solidification has a destabilizing effect upon the liquid. From this result it is concluded that convection can be brought about in the liquid phase at lower Marangoni numbers when solidification is present than when it is not. The effects of other parameters introduced by the solidification process are analyzed and discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer; 23; Feb. 198
    Format: text
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  • 13
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    Design of prototype charged particle fog dispersal unit (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The unit was designed to be easily modified so that certain features that influence the output current and particle size distribution could be examined. An experimental program was designed to measure the performance of the unit. The program described includes measurements in a fog chamber and in the field. Features of the nozzle and estimated nozzle characteristics are presented.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-3481 , M364
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Three-dimensional flow studies on a slotted transonic wind tunnel wall (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three-dimensional flow field measurements were made near a transonic slotted wall. Field velocity vectors and static pressure distributions have been obtained. The boundary layer displacement thickness was found to vary in the transverse plane with its maximum at the slot center line but decreased with increasing suction rate through the slot. The boundary layer characteristics were sensitive to the mass transfer through the slot. The projection on the flow field velocity vectors on the transverse plane reveals a vortex-like flow formation. The center of this secondary flow was located nearly at the edge of the wall shear layer and decreased in strength with applied suction. The secondary vortex motion may be attributed to the mean flow skewing, inhomogeneous transverse plane boundary layer and the wall turbulence anisotropy.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 82-0230 , Aerospace Sciences Meeting; Jan 11, 1982 - Jan 14, 1982; Orlando, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    Development of the Aries parachute system (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The design and testing of a two-stage parachute system to recover a space telescope weighing up to 2200 pounds is described. The system consists of a 15-ft diameter ribbon parachute reefed to 50 percent for 10 seconds and a 73-ft diameter paraform or cross second stage reefed to 20 percent for 10 seconds. The results of ten drop tests and two operational rocket launched flights are presented. Two successful operational recoveries of 1600-lb and 2050-lb NASA space telescopes were conducted at White Sands Missile Range, NM. The payloads are launched by ARIES rockets to altitudes of about 194 and 163 miles above sea level.
    Keywords: SPACE TRANSPORTATION
    Type: AIAA PAPER 81-1949 , American Institute of Aeronautics and Astronautics, Aerodynamic Decelerator and Balloon Technology Conference; Oct 21, 1981 - Oct 23, 1981; San Diego, CA
    Format: text
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  • 16
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    Development of the ARIES parachute system (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The design and testing of a two-stage parachute system to recover a space telescope weighing up to 2000 pounds is described. The system consists of a 15-ft dia ribbon parachute reefed to 50% for 10 seconds and a 73-ft dia paraform or cross second stage reefed to 10% for 10 seconds. The results of eight drop tests and one operational rocket launched flight and recovery are presented. A successful operational recovery of a 1600-lb NASA space telescope was conducted. The payload was launched by a second stage Minuteman rocket to an altitude of about 300 miles above sea level.
    Keywords: AERODYNAMICS
    Type: NASA-TM-84082 , DE81-012161 , SAND-81-0208C , CONF-811002-1 , AIAA Aerodyn. Decelerator and Balloon Technol. Conf.; Oct 21, 1981 - Oct 23, 1981; San Diego, CA; United States
    Format: application/pdf
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  • 17
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    Spacecraft Dynamics as Related to Laboratory Experiments in Space (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Proceedings are presented of a conference sponsored by the Physics and Chemistry Experiments in Space Working Group to discuss the scientific and engineering aspects involved in the design and performance of reduced to zero gravity experiments affected by spacecraft environments and dynamics. The dynamics of drops, geophysical fluids, and superfluid helium are considered as well as two phase flow, combustion, and heat transfer. Interactions between spacecraft motions and the atmospheric cloud physics laboratory experiments are also examined.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CP-2199 , M-362 , May 01, 1979 - May 02, 1979; Huntsville, AL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Studies of convection in a solidifying binary mixture at reduced gravity (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A great deal of interest was generated recently in the possibility of producing new materials in the reduced gravity environment provided during the forthcoming missions of Spacelab. The range of possibilities extend from producing large crystals of uniform properties to manufacturing materials with unique properties. Most of these processes involve the solidification of materials from the liquid state. Convective motions within the liquid during solidification can influence the local material composite and the shape of the solid-liquid interface which may result in solids with non-uniform properties and crystal defects. The microgravity environment of Spacelab is being viewed as one in which the buoyancy forces are eliminated so that convection driven by thermal gradients does occur, resulting in an improved solidification process. However, convection may occur for other reasons and whether convection is negligible or not during solidification constitutes processing in low-gravity environment. Little information exists presently on convection during solidification under such circumstances. A continuation of an analytical investigation into the nature of convective motion in a binary liquid layer due to surface tension forces during its solidification is reported. The onset of convection will be determined through a stability analysis which is described.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-170916 , NAS 1.26:170916 , BMR-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 19
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    Fog dispersion (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study of economically viable techniques for dispersing warm fog at commercial airports is presented. Five fog dispersion techniques are examined: evaporation suppression, downwash, mixing, seeding with hygroscopic material, thermal techniques, and charged particle techniques. Thermal techniques, although effective, were found to be too expensive for routine airport operations, and detrimental to the environment. Seeding or helicopter downwash are practical for small-scale or temporary fog clearing, but are probably not useful for airport operations on a routine basis. Considerable disagreement exists on the capability of charged particle techniques, which stems from the fact that different assumptions and parameter values are used in the analytical models. Recommendations resulting from the review of this technique are listed, and include: experimental measurements of the parameters in question; a study to ascertain possible safety hazards, such as increased electrical activity or fuel ignition during refueling operations which could render charged particle techniques impractical; and a study of a single charged particle generator.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: SAE PAPER 801133 , Aerospace Congress and Exposition; Oct 13, 1980 - Oct 16, 1980; Los Angeles, CA
    Format: text
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