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  • 1
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    Thermocapillary flows and their stability (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Steady convective flows for geometries of varying complexity are described. This in general involves the solution of nonlinear free boundary problems. The stability of these flows were determined to more complicated (perhaps time dependent) modes of fluid motion. These include shear flow and free surface instability modes, with possible coupling between them. The effect of surface chemical species is described, including impurities which act as surfactants and insoluble oxide films, on the convective patterns and their stability.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA. Marshall Space Flight Center Float Zone Workshop; p 49-54
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Thermocapillary Flows and Their Stability: Effects of Surface Layers and Contamination (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objective is to study quantitatively thermocapillary flows in two-dimensional and axisymmetric geometries in order to learn the impact of such flows on float-zone refining configurations. The work begins with the analytical study of steady flows in slots and zones to obtain predictions of surface curvature, flow and heat transport. It then examines the instability of such flows. Three new instability mechanisms have been identified and the results show that thermocapillary flows of high Prandtl number fluid become convectively unstable while those of low Prandtl number fluid become hydrodynamically unstable. The work includes numerical simulations of steady, high Marangoni number flows in unit aspect ratio boxes and asymptotic solutions in large boxes. Furthermore, the effect of surface contamination on the steady thermocapillary flows was examined. This fundamental study focused on fluid dynamical systems used to understand events in the flow of melts in float-zone geometries both on Earth and in microgravity environments.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA, Washington Microgravity Sci. and Appl. Program Tasks; p 98-99
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Catalog of double lunar swingby orbits for exploring the Earth's geomagnetic tail (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Forty three orbits, which are periodic in geocentric reference frames rotating at lunar and at solar rates were found using a patched conic technique. The different orbits provide coverage of different parts of the distant geomagnetic tail. The parameters for 43 sun synchronous double lunar swingby orbits and plots of the sun synchronous double lunar swingby orbits are included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-160066 , CSC/TM-80/6322
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Absorption of carbon dioxide by solid hydroxide sorbent beds in closed-loop atmospheric revitalization system (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The reactions of carbon dioxide with various metals are discussed. The equations which govern the rates of CO2 removal from the atmosphere in spacecraft environmental control systems are discussed. Results from performance testing of various Space Shuttle environmental control systems are presented with the correlation of the equations to the performance given.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: The characterization of carbon dioxide absorbing agents for life support equipment; Winter Annual Meeting; Nov 14, 1982 - Nov 19, 1982; Phoenix, AZ
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The factors influencing the formation of Li2CO3 from LiOH and CO2 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: LiOH is used to remove CO2 from the atmosphere in three environmental control systems of the Shuttle program, and the investigation of the performance dependent parameters for the CO2 reaction with LiOH is reported. Emphasis is placed on LiOH quality acceptance criteria and on identifiying the relationships between the reaction rate and the following independent parameters: temperature, CO2 partial pressure (PP), H2O concentration in the solid, amount of remaining LiOH and the porosity of the LiOH pellets. Results showed that the reaction rate is proportional to the CO2 PP for PP at least as high as 40 mm Hg (5330 N/sq m). It is also noted that a significant difference in the reactivity of wet and dry LiOH was not detected.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASME PAPER 80-ENAS-45 , Intersociety Environmental Systems Conference; Jul 14, 1980 - Jul 17, 1980; San Diego, CA
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  • 6
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    The dependence of the CO2 removal efficiency of LiOH on humidity and mesh size (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effect of humidity on the CO2 removal efficiency of small beds of anhydrous LiOH has been studied. Experimental data taken in this small bed system clearly show that there is an optimum humidity for beds loaded with LiOH from a single lot. The CO2 efficiency falls rapidly under dry conditions, but this behavior is approximately the same in all samples. The behavior of the bed under wet conditions is quite dependent on material size distribution. The presence of large particles in a sample can lead to rapid fall off in the CO2 efficiency as the humidity increases.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASME PAPER 78-ENAS-5 , American Society of Mechanical Engineers, Intersociety Conference on Environmental Systems; Jul 10, 1978 - Jul 13, 1978; San Diego, CA
    Format: text
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  • 7
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    Intelsat VI (F-3) reboost mission (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: As the result of a launch vehicle malfunction, the Intelsat VI(F-3) communications satellite failed to achieve geostationary orbit. The satellite is presently safe in a low-earth orbit pending a NASA Space Shuttle Program (SSP) mission to retrieve it and attach a solid rocket. This paper describes the recovery hardware design and the overall mission efforts undertaken to recover and reboost the satellite.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-1951
    Format: text
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  • 8
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    CO2 and humidity removal system for extended Shuttle missions - CO2, H2O, and trace contaminant equilibrium testing (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The equilibrium relationships for the co-adsorption of CO2 and H2O on an amine coated acrylic ester are presented. The equilibrium data collection and reduction techniques are discussed. Based on the equilibrium relationship, other modes of operation of systems containing HS-C are discussed and specific space applications for HS-C are presented. Equilibrium data for 10 compounds which are found as trace contaminants in closed environments are also presented.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: ASME PAPER 77-ENAS-4 , Intersociety Conference on Environmental Systems; Jul 11, 1977 - Jul 14, 1977; San Francisco, CA; US
    Format: text
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